Table of Contents
- 7E8 SAS Product Manual
- Seagate® Technology Support Services
- 1.0 Scope
- 2.0 Applicable standards and reference documentation
- 2.1 Standards
- 2.1.1 Safety certification
- 2.1.2 Electromagnetic compatibility
- 2.1.3 Electromagnetic compliance
- 2.1.4 European Union (EU) CE Marking Requirements
- 2.1.5 Australian RCM Compliance Mark
- 2.1.6 Canada ICES-003
- 2.1.7 South Korean KC Certification Mark
- 2.1.8 Morocco Commodity Mark
- 2.1.9 Taiwanese BSMI
- 2.1.10 FCC verification
- 2.2 Environmental protection
- 2.3 Reference documents
- 2.1 Standards
- 3.0 General description
- 4.0 Performance characteristics
- 5.0 Reliability specifications
- 6.0 Physical/electrical specifications
- 7.0 About FIPS
- 8.0 About self-encrypting drives
- 9.0 Defect and error management
- 10.0 Installation
- 11.0 Interface requirements
Seagate ST4000NM0255 User Manual
Displayed below is the user manual for ST4000NM0255 by Seagate which is a product in the Internal Hard Drives category. This manual has pages.
Related Manuals
5xxE sector size
Standard models
ST6000NM0095
ST4000NM0125
ST2000NM0135
Self-Encryption (SED) models
ST6000NM0195
ST4000NM0255
SED FIPS (140-2) models
ST6000NM0285
ST4000NM0235
4KN sector size
Standard models
ST6000NM0105
ST4000NM0095
ST2000NM0115
Self-Encryption (SED) models
ST6000NM0205
ST4000NM0075
SED FIPS (140-2) models
ST6000NM0255
100827322, Rev. B
October 2017
7E8 SAS Product Manual
Print Date:2017-Oct-31 14:50:59 CDT Released; Prod Rel; B; 100827322 Seagate Confidential
© 2017 Seagate Technology LLC. All rights reserved.
Publication number: 100827322, Rev. B October 2017
Seagate, Seagate Technology and the Spiral logo are registered trademarks of Seagate Technology LLC in the United States and/or other countries. Raid Rebuild and SeaTools are either
trademarks or registered trademarks of Seagate Technology LLC or one of its affiliated companies in the United States and/or other countries. The FIPS logo is a certification mark of NIST,
which does not imply product endorsement by NIST, the U.S., or Canadian governments.All other trademarks or registered trademarks are the property of their respective owners.
No part of this publication may be reproduced in any form without written permission of Seagate Technology LLC.
Call 877-PUB-TEK1 (877-782-8351) to request permission.
When referring to drive capacity, one gigabyte, or GB, equals one billion bytes and one terabyte, or TB, equals one trillion bytes. Your computer’s operating system may use a different
standard of measurement and report a lower capacity. In addition, some of the listed capacity is used for formatting and other functions, and thus will not be available for data storage.
Actual quantities will vary based on various factors, including file size, file format, features and application software. Actual data rates may vary depending on operating environment and
other factors. The export or re-export of hardware or software containing encryption may be regulated by the U.S. Department of Commerce, Bureau of Industry and Security (for more
information, visit www.bis.doc.gov), and controlled for import and use outside of the U.S. Seagate reserves the right to change, without notice, product offerings or specifications.
Document Revision History
Revision Date Pages affected and Description of changes
Rev. A 10/05/2017 Initial release.
Rev. B 10/18/2017 37 & 45: Corrected fastener penetration depth to 0.140 inches in Figure 4 & Section 10.0
Print Date:2017-Oct-31 14:50:59 CDT Released; Prod Rel; B; 100827322 Seagate Confidential
Seagate Exos 7E8 SAS Product Manual, Rev. B 2
Contents
Seagate® Technology Support Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.0 Applicable standards and reference documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.1 Safety certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.2 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.3 Electromagnetic compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.4 European Union (EU) CE Marking Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.5 Australian RCM Compliance Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.6 Canada ICES-003 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.7 South Korean KC Certification Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.8 Morocco Commodity Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.9 Taiwanese BSMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.10 FCC verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2 Environmental protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.1 European Union Restriction of Hazardous Substance Law. . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.2 China Requirements —China RoHS 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.3 Taiwan Requirements — Taiwan RoHS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.3 Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.0 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Standard features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2 Media description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.4 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.5 Formatted capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.6 Programmable drive capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.7 Factory-installed options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.0 Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1 Internal drive characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1.1 Format command execution time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1.2 General performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4 Cache operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.4.2 Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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Contents
5.0 Reliability specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1.1 Recoverable Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1.2 Unrecoverable Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1.3 Seek errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1.4 Interface errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2 Reliability and service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2.1 Annualized Failure Rate (AFR) and Mean Time Between Failure (MTBF) . . . . . . . . . . . . . . 20
5.2.2 Hot plugging the drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2.3 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2.4 Thermal monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.2.5 Drive Self Test (DST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.2.6 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.1 PowerChoiceTM power management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.1.1 PowerChoice reporting methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.2 AC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.3 DC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.3.1 Conducted noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.3.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.3.3 Current profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.4 Power dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.5 Environmental limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.5.1 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.5.2 Humidity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.5.3 Effective altitude (sea level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.5.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.5.5 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.5.6 Air cleanliness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.5.7 Corrosive environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.5.8 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.6 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Print Date:2017-Oct-31 14:50:59 CDT Released; Prod Rel; B; 100827322 Seagate Confidential
Seagate Exos 7E8 SAS Product Manual, Rev. B 4
Contents
7.0 About FIPS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.0 About self-encrypting drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.1 Data encryption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.2 Controlled access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.2.1 Admin SP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.2.2 Locking SP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.2.3 Default password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.3 Random number generator (RNG). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.4 Drive locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.5 Data bands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.6 Cryptographic erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.7 Authenticated firmware download . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.8 Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.9 Supported commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.10 Sanitize - CRYPTOGRAPHIC ERASE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.11 RevertSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
9.0 Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.1 Drive internal defects/errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.2 Drive error recovery procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.3 SAS system errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
9.4 Background Media Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.5 Media Pre-Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.6 Deferred Auto-Reallocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.7 Idle Read After Write. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.8 Protection Information (PI). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9.8.1 Levels of PI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9.8.2 Setting and determining the current Type Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9.8.3 Identifying a Protection Information drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
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Contents
10.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
10.1 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
10.2 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
10.3 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
10.4 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
11.0 Interface requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
11.1 SAS features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
11.1.1 task management functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
11.1.2 task management responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
11.2 Dual port support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
11.3 SCSI commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
11.3.1 Inquiry data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
11.3.2 Mode Sense data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
11.4 Miscellaneous operating features and conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
11.4.1 SAS physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
11.4.2 Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
11.4.3 Connector requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
11.4.4 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
11.4.5 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
11.4.6 SAS transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
11.4.7 Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
11.5 Signal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
11.5.1 Ready LED Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
11.5.2 Differential signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
11.6 SAS-3 Specification Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
11.7 Additional information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
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For information regarding online support and services, visit: http://www.seagate.com/contacts/
For information regarding Warranty Support, visit: http://www.seagate.com/support/warranty-and-replacements/
For information regarding data recovery services, visit: http://www.seagate.com/services-software/recover/
For Seagate OEM, Distribution partner and reseller portals, visit: http://www.seagate.com/partners/
Seagate® Technology Support Services
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1.0 Scope
This manual describes Seagate® Exos™ 7E8 SAS (Serial Attached SCSI) disk drives.
Seagate Exos 7E8 SAS drives support the SAS Protocol specifications to the extent described in this manual. The SAS Interface Manual
(part number 100293071) describes the general SAS characteristics of this and other Seagate SAS drives. The Self-Encrypting Drive
Reference Manual, part number 100515636, describes the interface, general operation, and security features available on Self-
Encrypting Drive models.
Product data communicated in this manual is specific only to the model numbers listed in this manual. The data listed in this manual
may not be predictive of future generation specifications or requirements. If designing a system which will use one of the models
listed or future generation products and need further assistance, please contact the Field Applications Engineer (FAE) or our global
support services group as shown in See “Seagate® Technology Support Services” on page 6.
Unless otherwise stated, the information in this manual applies to standard and Self-Encrypting Drive models.
.
Model type 5xxE 4KN
Standard
ST6000NM0095
ST4000NM0125
ST2000NM0135
ST6000NM0105
ST4000NM0095
ST2000NM0115
Self-Encrypting Drive ST6000NM0195
ST4000NM0255
ST6000NM0205
ST4000NM0075
SED FIPS (140-2) ST6000NM0285
ST4000NM0235
ST6000NM0255
Note Previous generations of Seagate Self-Encrypting Drive models were called Full Disk Encryption (FDE) models
before a differentiation between drive-based encryption and other forms of encryption was necessary.
Note The Self-Encrypting Drive models indicated on the cover of this product manual have provisions for “Security of Data
at Rest” based on the standards defined by the Trusted Computing Group (see www.trustedcomputinggroup.org).
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2.0 Applicable standards and reference documentation
The drives documented in this manual have been developed as system peripherals to the highest standards of design and
construction. The drives depends on host equipment to provide adequate power and environment for optimum performance and
compliance with applicable industry and governmental regulations. Special attention must be given in the areas of safety, power
distribution, shielding, audible noise control, and temperature regulation. In particular, the drive must be securely mounted to
guarantee the specified performance characteristics. Mounting by bottom holes must meet the requirements of Section 10.3.
2.1 Standards
The Seagate Exos 7E8 SAS family complies with Seagate standards as noted in the appropriate sections of this manual and the
Seagate SAS Interface Manual, part number 100293071.
The drives are recognized in accordance with UL 60950-1 as tested by UL, CSA 60950-1 as tested by CSA, and EN60950-1 as tested by
TUV.
The security features of Self-Encrypting Drive models are based on the “TCG Storage Architecture Core Specification” and the “TCG
Storage Workgroup Security Subsystem Class: Enterprise_A” specification with additional vendor-unique features as noted in this
product manual.
2.1.1 Safety certification
These products are certified to meet the requirements of UL/cUL 60950-1, EN 60950-1, and may also include, IEC 62368, UL 62368
and EN 62368.
2.1.2 Electromagnetic compatibility
The drive, as delivered, is designed for system integration and installation into a suitable enclosure prior to use. The drive is supplied
as a subassembly and is not subject to Subpart B of Part 15 of the FCC Rules and Regulations nor the Radio Interference Regulations
of the Canadian Department of Communications.
The design characteristics of the drive serve to minimize radiation when installed in an enclosure that provides reasonable shielding.
The drive is capable of meeting the Class B limits of the FCC Rules and Regulations of the Canadian Department of Communications
when properly packaged; however, it is the user’s responsibility to assure that the drive meets the appropriate EMI requirements in
their system. Shielded I/O cables may be required if the enclosure does not provide adequate shielding. If the I/O cables are external
to the enclosure, shielded cables should be used, with the shields grounded to the enclosure and to the host controller.
2.1.2.1 Electromagnetic susceptibility
As a component assembly, the drive is not required to meet any susceptibility performance requirements. It is the responsibility of
those integrating the drive within their systems to perform those tests required and design their system to ensure that equipment
operating in the same system as the drive or external to the system does not adversely affect the performance of the drive. See Table
3, DC power requirements.
2.1.3 Electromagnetic compliance
Seagate uses an independent laboratory to confirm compliance with the directives/standards for CE Marking and C-Tick Marking.
The drive was tested in a representative system for typical applications. The selected system represents the most popular
characteristics for test platforms. The system configurations include:
• Typical current use microprocessor
•Keyboard
• Monitor/display
•Printer
•Mouse
Although the test system with this Seagate model complies with the directives/standards, we cannot guarantee that all systems will
comply. The computer manufacturer or system integrator shall confirm EMC compliance and provide the appropriate marking for
their product.
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2.1.4 European Union (EU) CE Marking Requirements
Drives that display the CE mark comply with the European Union (EU) requirements specified in the Electromagnetic Compatibility
Directive (2014/30/EU) put into force on 20 April 2016. Testing is performed to the levels specified by the product standards for
Information Technology Equipment (ITE). Emission levels are defined by EN 55032:2012, Class B and the immunity levels are defined
by EN 55024:2010.
The drives also meet the requirements of The Low Voltage Directive (LVD) 2014/35/EU.
Seagate drives are tested in representative end-user systems. Although CE-marked Seagate drives comply with all relevant
regulatory requirements and standards for the drives, Seagate cannot guarantee that all system-level products into which the drives
are installed comply with all regulatory requirements and standards applicable to the system-level products. The drive is designed
for operation inside a properly designed system (e.g., enclosure designed for the drive), with properly shielded I/O cable (if
necessary) and terminators on all unused I/O ports. Computer manufacturers and system integrators should confirm EMC
compliance and provide CE marking for the system-level products.
For compliance with the RoHS "Recast" Directive 2011/65/EU (RoHS 2), Section 2.2.1 on page 10.
2.1.5 Australian RCM Compliance Mark
If these models have the RCM marking, they comply with the Australia/New Zealand Standard AS/NZ CISPR32 and meet the
Electromagnetic Compatibility (EMC) Framework requirements of the Australian Communication and Media Authority (ACMA).
2.1.6 Canada ICES-003
If this model has the ICES-003:2016 marking it complies with requirements of ICES tested per ANSI C63.4-2014.
2.1.7 South Korean KC Certification Mark
The South Korean KC Certification Mark means the drives comply with paragraph 1 of Article 11 of the Electromagnetic Compatibility
control Regulation and meet the Electromagnetic Compatibility (EMC) Framework requirements of the Radio Research Agency (RRA)
Communications Commission, Republic of Korea.These drives have been tested and comply with the Electromagnetic Interference/
Electromagnetic Susceptibility (EMI/EMS) for Class B products. Drives are tested in a representative, end-user system by a Korean-
recognized lab.
2.1.8 Morocco Commodity Mark
To satisfy our OEM customers, Seagate has added the Moroccan Commodity Mark to the drives provided to the OEM for the sale of
Customer Kits produced by our OEM customers that are intended to be incorporated into the OEM's finished system-level product by
an end user. The Customer Kits are considered 'devices' under Morocco's Order of the Minister of Industry, Trade, Investment and
Digital Economy No. 2574-14 of 29 Ramadan 1436 (16 July 2015) on electromagnetic compatibility of equipment.
Seagate drives are tested for compliance and complies with the European Union (EU) Electromagnetic Compatibility (EMC) Directive
2014/30/EU and the Low Voltage Directive (LVD) 2014/35/EU. Accordingly, the drives also meets the requirements of Morocco's
Order of the Minister of Industry, Trade, Investment and Digital Economy No. 2574-14 of 29 Ramadan 1436 (16 July 2015) on
electromagnetic compatibility of equipment.
2.1.9 Taiwanese BSMI
Drives with the Taiwanese certification mark comply with Chinese National Standard, CNS13438.
For compliance with the Taiwan Bureau of Standards, Metrology and Inspection’s (BSMI) requirements, Section 2.2.3 on page 11.
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2.1.10 FCC verification
These drives are intended to be contained solely within a personal computer or similar enclosure (not attached as an external
device). As such, each drive is considered to be a subassembly even when it is individually marketed to the customer. As a
subassembly, no Federal Communications Commission verification or certification of the device is required.
Seagate has tested this device in enclosures as described above to ensure that the total assembly (enclosure, disk drive,
motherboard, power supply, etc.) does comply with the limits for a Class B computing device, pursuant to Subpart J, Part 15 of the
FCC rules. Operation with noncertified assemblies is likely to result in interference to radio and television reception.
Radio and television interference. This equipment generates and uses radio frequency energy and if not installed and used in
strict accordance with the manufacturer’s instructions, may cause interference to radio and television reception.
This equipment is designed to provide reasonable protection against such interference in a residential installation. However, there is
no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or
television, which can be determined by turning the equipment on and off, users are encouraged to try one or more of the following
corrective measures:
• Reorient the receiving antenna.
• Move the device to one side or the other of the radio or TV.
• Move the device farther away from the radio or TV.
• Plug the computer into a different outlet so that the receiver and computer are on different branch outlets.
If necessary, users should consult a dealer or an experienced radio/television technician for additional suggestions. Users may find
helpful the following booklet prepared by the Federal Communications Commission: How to Identify and Resolve Radio-Television
Interference Problems. This booklet is available from the Superintendent of Documents, U.S. Government Printing Office, Washington,
DC 20402. Refer to publication number 004-000-00345-4.
2.2 Environmental protection
Seagate designs its products to meet environmental protection requirements worldwide, including regulations restricting certain
chemical substances.
2.2.1 European Union Restriction of Hazardous Substance Law
2.2.1.1 Restriction of Hazardous Substances in Electrical and Electronic Equipment
Seagate drives are designed to be compliant with the European Union RoHS "Recast" Directive 2011/65/EU (RoHS 2) as amended by
Directive (EU) 2015/863. The RoHS2 restricts the use of certain hazardous substances such as Lead, Cadmium, Mercury, Hexavalent
Chromium, Polybrominated Biphenyls (PBB) and Polybrominated Diphenyl Ether (PBDE), BisBis(2-Ethylhexyl) phthalate (DEHP),
Benzyl butyl phthalate (BBP), Dibutyl phthalate (DBP), and Diisobutyl phthalate (DIBP) in electrical and electronic equipment (EEE).
2.2.1.2 Substances of Very High Concern (SVHC)
The European Union REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) Regulation (EC) 1907/2006
regulates chemicals shipped into and used in Europe. A number of parts and materials in Seagate products are procured from
external suppliers. We rely on the representations of our suppliers regarding the presence of REACH substances in these articles and
materials. Our supplier contracts require compliance with our chemical substance restrictions, and our suppliers document their
compliance with our requirements by providing full-disclosure material content declarations that disclose inclusion of any REACH-
regulated substance in such articles or materials. Product-specific REACH declarations are available upon request through your
Seagate Sales Representative.
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2.2.2 China Requirements —China RoHS 2
China RoHS 2 refers to the Ministry of Industry and Information Technology Order No. 32, effective July 1, 2016, titled
Management Methods for the Restriction of the Use of Hazardous Substances in Electrical and Electronic Products. To
comply with China RoHS 2, Seagate determines this product's Environmental Protection Use Period (EPUP) to be 20
years in accordance with the Marking for the Restricted Use of Hazardous Substances in Electronic and Electrical Products,
SJT 11364-2014.
2.2.3 Taiwan Requirements — Taiwan RoHS
Taiwan RoHS refers to the Taiwan Bureau of Standards, Metrology and Inspection’s (BSMI) requirements in standard CNS 15663,
Guidance to reduction of the restricted chemical substances in electrical and electronic equipment. Seagate products must comply
with the “Marking of presence” requirements in Section 5 of CNS 15663, effective January 1, 2018. This product is Taiwan RoHS
compliant.
The following table meets the Section 5 “Marking of presence” requirements.
Table 1 China - Hazardous Substances
部件名称
Part Name
有害物质
Hazardous Substances
铅
(Pb)
汞
(Hg)
镉
(Cd)
六价铬
(Cr+6)
多溴联苯
(PBB)
多溴二苯醚
(PBDE)
硬盘驱动器
HDD XOO O O O
印刷电路板组装
PCBA XOO O O O
本表格依据 SJ/T 11364 的规定编制。
This table is prepared in accordance with the provisions of SJ/T 11364-2014
O：表示该有害物质在该部件所有均质材料中的含量均在 GB/T 26572 规定的限量要求以下。
O：Indicates that the hazardous substance contained in all of the homogeneous materials for this
part is below the limit requirement of GB/T26572.
X：表示该有害物质至少在该部件的某一均质材料中的含量超出 GB/T 26572 规定的限量要求。
X：Indicates that the hazardous substance contained in at least one of the homogeneous materials
used for this part is above the limit requirement of GB/T26572.
Table 2 Taiwan - Restricted Substances
設備名稱：硬盤設備，型號：僅適用于內部使用
Equipment Name: Hard Disk Device, Type Designation: Internal Use Only
單元
Unit
限用物質及其化學符號
Restricted Substance and its chemical symbol
铅
(Pb)
汞
(Hg)
镉
(Cd)
六价铬
(Cr+6)
多溴联苯
(PBB)
多溴二苯醚
(PBDE)
硬盤驅動器
HDD —OOOOO
印刷电路板组装
PCBA —OOOOO
備考 1. "O" 係指該项限用物質之百分比含量未超出百分比含量基準值。
Note 1. "O" indicates that the percentage content of the restricted substance
does not exceed the percentage of reference value of presence.
備考 2. "—" 係指該项限用物質為排除項目。
Note 2. "—" indicates that the restricted substance corresponds to the exemption.
20
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2.3 Reference documents
SAS Interface Manual
Seagate part number: 100293071
SCSI Commands Reference Manual
Seagate part number: 100293068
Self-Encrypting Drives Reference Manual
Seagate part number: 100515636
ANSI SAS Documents
SFF-8323 3.5” Drive Form Factor with Serial Connector
SFF-8460 HSS Backplane Design Guidelines
SFF-8470 Multi Lane Copper Connector
SFF-8482 SAS Plug Connector
INCITS 515 SCSI Architecture Model-5 (SAM-5) Revision 11
INCITS 502 SCSI Primary Commands-5 (SPC-5) Revision 10
INCITS 506 SCSI Block Commands-4 (SBC-4) Revision 10
INCITS 534 Serial Attached SCSI-4 (SAS-4)
INCITS 538 SAS Protocol Layer-4 (SPL-4) Revision 08
ANSI INCITS 481-2011 FC Protocol for SCSI-4 (FCP-4)
Trusted Computing Group (TCG) Documents (apply to Self-Encrypting Drive models only)
TCG Storage Architecture Core Specification, v1.00
TCG Storage Security Subsystem Class Enterprise Specification, v1.01
Specification for Acoustic Test Requirement and Procedures
Seagate part number: 30553-001
In case of conflict between this document and any referenced document, this document takes precedence.
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3.0 General description
Seagate Exos 7E8 SAS drives provide high performance, high capacity data storage for a variety of systems including engineering
workstations, network servers, mainframes, and supercomputers. The Serial Attached SCSI interface is designed to meet next-
generation computing demands for performance, scalability, flexibility and high-density storage requirements.
Seagate Exos 7E8 SAS drives are random access storage devices designed to support the Serial Attached SCSI Protocol as described
in the ANSI specifications, this document, and the SAS Interface Manual (part number 100293071) which describes the general
interface characteristics of this drive. Seagate Exos 7E8 SAS drives are classified as intelligent peripherals and provide level 2
conformance (highest level) with the ANSI SCSI-1 standard. The SAS connectors, cables and electrical interface are compatible with
Serial ATA (SATA), giving future users the choice of populating their systems with either SAS or SATA hard disk drives. This allows users
to continue to leverage existing investment in SCSI while gaining a 12Gb/s serial data transfer rate.
The Self-Encrypting Drive models indicated on the cover of this product manual have provisions for “Security of Data at Rest” based
on the standards defined by the Trusted Computing Group (see www.trustedcomputinggroup.org).
The head and disk assembly (HDA) is sealed at the factory. Air recirculates within the HDA through a non-replaceable filter to
maintain a contamination-free HDA environment.
Seagate Exos 7E8 SAS drives use a dedicated load/unload zone at the outermost radius of the media to eliminate the possibility of
destroying or degrading data by landing in the data zone. The heads automatically go to the ramp load/unload when power is
removed from the drive.
An automatic shipping lock prevents potential damage to the heads and discs that results from movement during shipping and
handling. The shipping lock disengages and the head load process begins when power is applied to the drive.
Seagate Exos 7E8 SAS drives decode track 0 location data from the servo data embedded on each surface to eliminate mechanical
transducer adjustments and related reliability concerns.
The drives also use a high-performance actuator assembly with a low-inertia, balanced, patented, straight arm design that provides
excellent performance with minimal power dissipation.
Note
Never disassemble the HDA and do not attempt to service items in the sealed enclosure
(heads, media, actuator, etc.) as this requires special facilities. The drive does not contain
user-replaceable parts. Opening the HDA for any reason voids the product warranty.
Note Seagate recommends validating the configuration with the selected HBA/
RAID controller manufacturer to ensure use of full capacity is supported.
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3.1 Standard features
Seagate Exos 7E8 SAS drives have the following standard features:
• 3.0 / 6.0/12.0 Gb Serial Attached SCSI (SAS) interface
• 128 - deep task set (queue)
• Dedicated head load/unload zone
• Drive Self Test (DST)
• Embedded servo design
• Firmware downloadable using the SAS interface
• Flawed logical block reallocation at format time
• Idle Read After Write (IRAW)
• Industry standard SFF 3.5-in dimensions
• Integrated dual port SAS controller supporting the SCSI protocol
• Jumperless configuration.
• No preventive maintenance or adjustments required
• Perpendicular recording technology
•Power Save
• Programmable auto write and read reallocation
• Programmable logical block reallocation scheme
• Reallocation of defects on command (Post Format)
• SAS Power Disable
•Seagate RAID Rebuild
TM
• Self diagnostics performed when power is applied to the drive
• Support for SAS expanders and fanout adapters
• Supports up to 32 initiators
• Tarnish-resistant components to help protect drive from environmental elements, increasing field reliability
• User-selectable logical block sizes for 4KN (4096, 4160 or 4224 bytes per logical block).
• User-selectable logical block sizes for 5xxE (512, 520 or 528 bytes per logical block).
• Vertical, horizontal, or top down mounting
Seagate Exos 7E8 SAS Self-Encrypting Drive models have the following additional features:
• 16 independent data bands
• Authenticated firmware download
• Automatic data encryption/decryption
• Controlled access
• Cryptographic erase of user data for a drive that will be repurposed or scrapped
•Drive locking
• Random number generator
3.2 Media description
The media used on the drive has a aluminum substrate coated with a thin film magnetic material, overcoated with a proprietary
protective layer for improved durability and environmental protection.
3.3 Performance
• 1200MB/s maximum instantaneous data transfers.
• 7200 RPM spindle. Average latency = 4.16ms
• Adaptive seek velocity; improved seek performance
• Background processing of queue
• Programmable multi-segmentable cache buffer
• Supports start and stop commands (spindle stops spinning)
.
Note There is no significant performance difference between Self-Encrypting
Drive and standard (non-Self-Encrypting Drive) models.
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3.4 Reliability
• 5-year warranty
• Annualized Failure Rate (AFR) of 0.44%
• Balanced low mass rotary voice coil actuator
• Incorporates industry-standard Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.)
• Mean time between failures (MTBF) of 2,000,000 hours
3.5 Formatted capacities
Standard OEM models are formatted to 512 bytes per block. The block size is selectable at format time and must be a multiple of 4
bytes. Users having the necessary equipment may modify the data block size before issuing a format command and obtain different
formatted capacities than those listed.
To provide a stable target capacity environment and at the same time provide users with flexibility if they choose, Seagate
recommends product planning in one of two modes:
1. Seagate designs specify capacity points at certain block sizes that Seagate guarantees current and future products will meet. We recommend
customers use this capacity in their project planning, as it ensures a stable operating point with backward and forward compatibility from gen-
eration to generation. The current guaranteed operating points for this product are
3.6 Programmable drive capacity
Using the Mode Select command, the drive can change its capacity to something less than maximum. See the Mode Select (6)
parameter list table in the SAS Interface Manual, part number 100293071. A value of zero in the Number of Blocks field indicates that
the drive will not change the capacity it is currently formatted to have. A number other than zero and less than the maximum
number of LBAs in the Number of Blocks field changes the total drive capacity to the value in the Number of Blocks field. A value
greater than the maximum number of LBAs is rounded down to the maximum capacity.
3.7 Factory-installed options
Users may order the following items which are incorporated at the manufacturing facility during production or packaged before
shipping. Some of the options available are (not an exhaustive list of possible options):
• Other capacities can be ordered depending on sparing scheme and sector size requested.
• Single-unit shipping pack. The drive is normally shipped in bulk packaging to provide maximum protection against transit damage. Units
shipped individually require additional protection as provided by the single unit shipping pack. Users planning single unit distribution should
specify this option.
•The Safety and Regulatory Agency Specifications, part number 75789512, is usually included with each standard OEM drive shipped, but extra cop-
ies may be ordered.
Sector
Size
6TB models 4TB models 2TB models
Decimal Hex Decimal Hex Decimal Hex
512 11,721,045,168 2BAA0F4B0 7,814,037,168 1D1C0BEB0 3,907,029,168 E8E088B0
520 11,473,076,960 2ABD942E0 7,648,717,976 1C7E62C98 3,824,358,992 E3F31650
528 11,157,495,560 29909DF08 7,438,330,376 1BB5BEA08 3,719,165,192 DDADF508
4096 1,465,130,646 57541E96 976,754,646 3A3817D6 488,378,646 1D1C1116
4160 1,436,538,464 559FD660 957,692,312 39153998 478,846,160 1C8A9CD0
4224 1,407,670,456 53E758B8 938,446,976 37EF9080 469,223,488 1BF7C840
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4.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Seagate Exos 7E8 SAS
drives.
4.1 Internal drive characteristics
Drive capacity 6TB models 4TB models 2TB models (formatted, rounded off value)
Read/write data heads 10 7 4
Bytes/track 1,470,464 Bytes (average, rounded off values)
Bytes/surface 500,000 MB (unformatted, rounded off values)
Tracks/surface (total) 337,400 Tracks (user accessible)
Tracks/in 369,000 TPI (average)
Peak bits/in 2,018,000 BPI
Areal density 733 Gb/in2
Internal data rate 2432 Mb/s (max)
Disk rotation speed 7200 RPM
Avg rotational latency 4.16 ms
4.1.1 Format command execution time
Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the request for a Status Byte
Transfer to the Initiator (excluding connect/disconnect).
When changing sector sizes, the format times shown above may need to be increased by 30 minutes.
4.1.2 General performance characteristics
5xxE-byte sectors (minutes) 6TB models 4TB models 2TB models
Maximum (with verify) 1168.83 814 393
Maximum (without verify) 596.17 380 197
4KN-byte sectors (minutes) 6TB models 4TB models 2TB models
Maximum (with verify) 1185.62 814 393.65
Maximum (without verify) 597.35 380 200.73
Minimum sector interleave 1 to 1
Maximum Internal data rate* 2.32 Gb/s
Sustained transfer rate 100 to 216 MiB/s **
SAS Interface maximum instantaneous transfer rate 1200MB/s* per port
(dual port = 2400MB/s*)
Logical block sizes
512 (default), 520, 524 or 528.
Read/write consecutive sectors on a track Yes
Flaw reallocation performance impact
(for flaws reallocated at format time using the spare sectors per sparing zone reallocation scheme.) Negligible
Average rotational latency 4.16ms
*Assumes no errors and no relocated logical blocks. Rate measured from the start of the first logical block transfer to or from the host.
** MiB/s x 1.048 = MB/s
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4.2 Start/stop time
The drive accepts the commands listed in the SAS Interface Manual less than 3 seconds after DC power has been applied.
If the drive receives a NOTIFY (ENABLE SPINUP) primitive through either port and has not received a START STOP UNIT command with
the START bit equal to 0, the drive becomes ready for normal operations within 30 seconds (excluding the error recovery procedure).
If the drive receives a START STOP UNIT command with the START bit equal to 0 before receiving a NOTIFY (ENABLE SPINUP)
primitive, the drive waits for a START STOP UNIT command with the START bit equal to 1. After receiving a START STOP UNIT
command with the START bit equal to 1, the drive waits for a NOTIFY (ENABLE SPINUP) primitive. After receiving a NOTIFY (ENABLE
SPINUP) primitive through either port, the drive becomes ready for normal operations within 30 seconds (excluding the error
recovery procedure).
If the drive receives a START STOP UNIT command with the START bit and IMMED bit equal to 1 and does not receive a NOTIFY
(ENABLE SPINUP) primitive within 5 seconds, the drive fails the START STOP UNIT command.
The START STOP UNIT command may be used to command the drive to stop the spindle. Stop time is 23 seconds (maximum) from
removal of DC power. SCSI stop time is 23 seconds. There is no power control switch on the drive.
4.3 Prefetch/multi-segmented cache control
The drive provides a prefetch (read look-ahead) and multi-segmented cache control algorithms that in many cases can enhance
system performance. Cache refers to the drive buffer storage space when it is used in cache operations. To select this feature, the
host sends the Mode Select command with the proper values in the applicable bytes in page 08h. Prefetch and cache operations are
independent features from the standpoint that each is enabled and disabled independently using the Mode Select command;
however, in actual operation, the prefetch feature overlaps cache operation somewhat as described in sections 4.4.1 and 4.4.2.
All default cache and prefetch mode parameter values (Mode Page 08h) for standard OEM versions of this drive family are given in
Table 11.
4.4 Cache operation
.
Of the 128MB physical buffer space in the drive, approximately (60,000) KB can be used as a cache. The buffer is divided into logical
segments from which data is read and to which data is written.
The drive keeps track of the logical block addresses of the data stored in each segment of the buffer. If the cache is enabled (see RCD
bit in the SAS Interface Manual ), data requested by the host with a read command is retrieved from the buffer, if possible, before any
disk access is initiated. If cache operation is not enabled, the buffer is still used, but only as circular buffer segments during disk
medium read operations (disregarding Prefetch operation for the moment). That is, the drive does not check in the buffer segments
for the requested read data, but goes directly to the medium to retrieve it. The retrieved data merely passes through some buffer
segment on the way to the host. All data transfers to the host are in accordance with buffer-full ratio rules. See the explanation
provided with the information about Mode Page 02h (disconnect/reconnect control) in the SAS Interface Manual.
The following is a simplified description of the prefetch/cache operation:
Case A—read command is received and all of the requested logical blocks are already in the cache:
1. Drive transfers the requested logical blocks to the initiator.
Case B—A Read command requests data, and at least one requested logical block is not in any segment of the cache:
1. The drive fetches the requested logical blocks from the disk and transfers them into a segment, and then from there to the host in accordance
with the Mode Select Disconnect/Reconnect parameters, page 02h.
2. If the prefetch feature is enabled, refer to section 4.4.2 for operation from this point.
Each cache segment is actually a self-contained circular buffer whose length is an integer number of logical blocks. The drive
dynamically creates and removes segments based on the workload. The wrap-around capability of the individual segments greatly
enhances the cache’s overall performance.
The size of each segment is not reported by Mode Sense command page 08h, bytes 14 and 15. The value 0XFFFF is always reported
regardless of the actual size of the segment. Sending a size specification using the Mode Select command (bytes 14 and 15) does not
set up a new segment size. If the STRICT bit in Mode page 00h (byte 2, bit 1) is set to one, the drive responds as it does for any
attempt to change an unchangeable parameter.
Note Refer to the SAS Interface Manual for more detail concerning the cache bits.
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4.4.1 Caching write data
Write caching is a write operation by the drive that makes use of a drive buffer storage area where the data to be written to the
medium is stored while the drive performs the Write command.
If read caching is enabled (RCD=0), then data written to the medium is retained in the cache to be made available for future read
cache hits. The same buffer space and segmentation is used as set up for read functions. The buffer segmentation scheme is set up or
changed independently, having nothing to do with the state of RCD. When a write command is issued, if RCD=0, the cache is first
checked to see if any logical blocks that are to be written are already stored in the cache from a previous read or write command. If
there are, the respective cache segments are cleared. The new data is cached for subsequent Read commands.
If the number of write data logical blocks exceed the size of the segment being written into, when the end of the segment is reached,
the data is written into the beginning of the same cache segment, overwriting the data that was written there at the beginning of
the operation; however, the drive does not overwrite data that has not yet been written to the medium.
If write caching is enabled (WCE=1), then the drive may return Good status on a write command after the data has been transferred
into the cache, but before the data has been written to the medium. If an error occurs while writing the data to the medium, and
Good status has already been returned, a deferred error will be generated.
The Synchronize Cache command may be used to force the drive to write all cached write data to the medium. Upon completion of a
Synchronize Cache command, all data received from previous write commands will have been written to the medium. Table 11
shows the mode default settings for the drive.
4.4.2 Prefetch operation
If the Prefetch feature is enabled, data in contiguous logical blocks on the disk immediately beyond that which was requested by a
Read command are retrieved and stored in the buffer for immediate transfer from the buffer to the host on subsequent Read
commands that request those logical blocks (this is true even if cache operation is disabled). Though the prefetch operation uses the
buffer as a cache, finding the requested data in the buffer is a prefetch hit, not a cache operation hit.
To enable Prefetch, use Mode Select page 08h, byte 12, bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch.
The drive does not use the Max Prefetch field (bytes 8 and 9) or the Prefetch Ceiling field (bytes 10 and 11).
When prefetch (read look-ahead) is enabled (enabled by DRA = 0), the drive enables prefetch of contiguous blocks from the disk
when it senses that a prefetch hit will likely occur. The drive disables prefetch when it decides that a prefetch hit is not likely to occur.
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5.0 Reliability specifications
The following reliability specifications assume correct host and drive operational interface, including all interface timings, power
supply voltages, environmental requirements and drive mounting constraints.
5.1 Error rates
The error rates stated in this manual assume the following:
• The drive is operated in accordance with this manual using DC power as defined in paragraph 6.3, "DC power requirements."
• Errors caused by host system failures are excluded from error rate computations.
•Assume random data.
• Default OEM error recovery settings are applied. This includes AWRE, ARRE, full read retries, full write retries and full retry time.
5.1.1 Recoverable Errors
Recoverable errors are those detected and corrected by the drive, and do not require user intervention.
Recoverable Data errors will use correction, although ECC on-the-fly is not considered for purposes of recovered error specifications.
Recovered Data error rate is determined using read bits transferred for recoverable errors occurring during a read, and using write
bits transferred for recoverable errors occurring during a write.
5.1.2 Unrecoverable Errors
An unrecoverable data error is defined as a failure of the drive to recover data from the media. These errors occur due to head/media
or write problems. Unrecoverable data errors are only detected during read operations, but not caused by the read. If an
unrecoverable data error is detected, a MEDIUM ERROR (03h) in the Sense Key will be reported. Multiple unrecoverable data errors
resulting from the same cause are treated as 1 error.
5.1.3 Seek errors
A seek error is defined as a failure of the drive to position the heads to the addressed track. After detecting an initial seek error, the
drive automatically performs an error recovery process. If the error recovery process fails, a seek positioning error (Error code = 15h
or 02h) will be reported with a Hardware error (04h) in the Sense Key. Recoverable seek errors are specified at Less than 10 errors in
108 seeks. Unrecoverable seek errors (Sense Key = 04h) are classified as drive failures.
5.1.4 Interface errors
An interface error is defined as a failure of the receiver on a port to recover the data as transmitted by the device port connected to
the receiver. The error may be detected as a running disparity error, illegal code, loss of word sync, or CRC error.
Seek error rate: Less than 10 errors in 108 seeks
Read Error Rates1
1. Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.
Recovered Data Less than 10 errors in 1012 bits transferred (OEM default settings)
Unrecovered Data Less than 1 sector in 1015 bits transferred
Miscorrected Data Less than 1 sector in 1021 bits transferred
Interface error rate: Less than 1 error in 1012 bits transferred
Mean Time Between Failure (MTBF): 2,000,000 hours
Annualized Failure Rate (AFR): 0.44%
Preventive maintenance: None required
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5.2 Reliability and service
Users can enhance the reliability of Seagate Exos 7E8 SAS disk drives by ensuring that the drive receives adequate cooling. Section
6.0 provides temperature measurements and other information that may be used to enhance the service life of the drive. Section
10.2 provides recommended air-flow information.
5.2.1 Annualized Failure Rate (AFR) and Mean Time Between Failure (MTBF)
The production disk drive shall achieve an annualized failure-rate of 0.44% (MTBF of 2,000,000 hours) over a 5 year service life when
used in Enterprise Storage field conditions as limited by the following:
• 8760 power-on hours per year.
• HDA temperature as reported by the drive <= 40°C
• Ambient wet bulb temp <= 26°C
• Typical workload
• The AFR (MTBF) is a population statistic not relevant to individual units
• ANSI/ISA S71.04-2013 G2 classification levels and dust contamination to ISO 14644-1 Class 8 standards (as measured at the device)
The MTBF specification for the drive assumes the operating environment is designed to maintain nominal drive temperature and
humidity. Occasional excursions in operating conditions between the rated MTBF conditions and the maximum drive operating
conditions may occur without significant impact to the rated MTBF. However continual or sustained operation beyond the rated
MTBF conditions will degrade the drive MTBF and reduce product reliability.
5.2.2 Hot plugging the drive
When a disk is powered on by switching the power or hot plugged, the drive runs a self test before attempting to communicate on
its’ interfaces. When the self test completes successfully, the drive initiates a Link Reset starting with OOB. An attached device should
respond to the link reset. If the link reset attempt fails, or any time the drive looses sync, the drive initiated link reset. The drive will
initiate link reset once per second but alternates between port A and B. Therefore each port will attempt a link reset once per 2
seconds assuming both ports are out of sync.
If the self-test fails, the drive does not respond to link reset on the failing port.
It is the responsibility of the systems integrator to assure that no temperature, energy, voltage hazard, or ESD potential hazard is
presented during the hot connect/disconnect operation. Discharge the static electricity from the drive carrier prior to inserting it
into the system.
Nonrecoverable read errors 1 per 1015 bits read, max
Load unload cycles 600,000 cycles
Maximum Rated Workload Maximum rate of <550TB/year
Workloads exceeding the annualized rate may degrade the drive MTBF and impact product
reliability. The Annualized Workload Rate is in units of TB per year, or TB per 8760 power on
hours. Workload Rate = TB transferred * (8760 / recorded power on hours).
Warranty To determine the warranty for a specific drive, use a web browser to access the following
web page: http://www.seagate.com/support/warranty-and-replacements/.
From this page, click on the “Is my Drive under Warranty” link. The following are required to
be provided: the drive serial number, model number (or part number) and country of
purchase. The system will display the warranty information for the drive.
Preventive maintenance None required.
Caution The drive motor must come to a complete stop prior to changing
the plane of operation. This time is required to insure data integrity.
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5.2.3 S.M.A.R.T.
S.M.A.R.T. is an acronym for Self-Monitoring Analysis and Reporting Technology. This technology is intended to recognize conditions
that indicate imminent drive failure and is designed to provide sufficient warning of a failure to allow users to back up the data
before an actual failure occurs.
Each monitored attribute has been selected to monitor a specific set of failure conditions in the operating performance of the drive
and the thresholds are optimized to minimize “false” and “failed” predictions.
Controlling S.M.A.R.T.
The operating mode of S.M.A.R.T. is controlled by the DEXCPT and PERF bits on the Informational Exceptions Control mode page
(1Ch). Use the DEXCPT bit to enable or disable the S.M.A.R.T. feature. Setting the DEXCPT bit disables all S.M.A.R.T. functions. When
enabled, S.M.A.R.T. collects on-line data as the drive performs normal read and write operations. When the PERF bit is set, the drive is
considered to be in “On-line Mode Only” and will not perform off-line functions.
Users can measure off-line attributes and force the drive to save the data by using the Rezero Unit command. Forcing S.M.A.R.T.
resets the timer so that the next scheduled interrupt is in one hour.
Users can interrogate the drive through the host to determine the time remaining before the next scheduled measurement and data
logging process occurs. To accomplish this, issue a Log Sense command to log page 0x3E. This allows the user to control when
S.M.A.R.T. interruptions occur. Forcing S.M.A.R.T. with the RTZ command resets the timer.
Performance impact
S.M.A.R.T. attribute data is saved to the disk so that the events that caused a predictive failure can be recreated. The drive measures
and saves parameters once every one hour subject to an idle period on the drive interfaces. The process of measuring off-line
attribute data and saving data to the disk is interruptable. The maximum on-line only processing delay is summarized below:
Reporting control
Reporting is controlled by the MRIE bits in the Informational Exceptions Control mode page (1Ch). An example, if the MRIE is set to
one, the firmware will issue to the host an 01-5D00 sense code. The FRU field contains the type of predictive failure that occurred. The
error code is preserved through bus resets and power cycles.
Determining rate
S.M.A.R.T. monitors the rate at which errors occur and signals a predictive failure if the rate of degraded errors increases to an
unacceptable level. To determine rate, error events are logged and compared to the number of total operations for a given attribute.
The interval defines the number of operations over which to measure the rate. The counter that keeps track of the current number of
operations is referred to as the Interval Counter.
S.M.A.R.T. measures error rates. All errors for each monitored attribute are recorded. A counter keeps track of the number of errors for
the current interval. This counter is referred to as the Failure Counter.
Error rate is the number of errors per operation. The algorithm that S.M.A.R.T. uses to record rates of error is to set thresholds for the
number of errors and their interval. If the number of errors exceeds the threshold before the interval expires, the error rate is
considered to be unacceptable. If the number of errors does not exceed the threshold before the interval expires, the error rate is
considered to be acceptable. In either case, the interval and failure counters are reset and the process starts over.
Predictive failures
S.M.A.R.T. signals predictive failures when the drive is performing unacceptably for a period of time. The firmware keeps a running
count of the number of times the error rate for each attribute is unacceptable. To accomplish this, a counter is incremented each time
the error rate is unacceptable and decremented (not to exceed zero) whenever the error rate is acceptable. If the counter continually
increments such that it reaches the predictive threshold, a predictive failure is signaled. This counter is referred to as the Failure
History Counter. There is a separate Failure History Counter for each attribute.
Note The drive’s firmware monitors specific attributes for degradation over time but can’t predict instantaneous drive failures.
Maximum processing delay
Fully-enabled delay DEXCPT = 0
S.M.A.R.T. delay times 75 ms
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5.2.4 Thermal monitor
Seagate Exos 7E8 SAS drives implement a temperature warning system which:
1. Signals the host if the temperature exceeds a value which would threaten the drive.
2. Saves a S.M.A.R.T. data frame on the drive which exceeds the threatening temperature value.
A temperature sensor monitors the drive temperature and issues a warning over the interface when the temperature exceeds a set
threshold. The temperature is measured at power-up and then at ten-minute intervals after power-up.
The thermal monitor system generates a warning code of 01-0B01 when the temperature exceeds the specified limit in compliance
with the SCSI standard.
This feature is controlled by the Enable Warning (EWasc) bit, and the reporting mechanism is controlled by the Method of Reporting
Informational Exceptions field (MRIE) on the Informational Exceptions Control (IEC) mode page (1Ch).
5.2.5 Drive Self Test (DST)
Drive Self Test (DST) is a technology designed to recognize drive fault conditions that qualify the drive as a failed unit. DST validates
the functionality of the drive at a system level.
There are two test coverage options implemented in DST:
1. Extended test
2. Short test
The most thorough option is the extended test that performs various tests on the drive and scans every logical block address (LBA) of
the drive. The short test is time-restricted and limited in length—it does not scan the entire media surface, but does some
fundamental tests and scans portions of the media.
If DST encounters an error during either of these tests, it reports a fault condition. If the drive fails the test, remove it from service and
return it to Seagate for service.
5.2.5.1 DST failure definition
The drive will present a “diagnostic failed” condition through the self-tests results value of the diagnostic log page if a functional
failure is encountered during DST. The channel and servo parameters are not modified to test the drive more stringently, and the
number of retries are not reduced. All retries and recovery processes are enabled during the test. If data is recoverable, no failure
condition will be reported regardless of the number of retries required to recover the data.
The following conditions are considered DST failure conditions:
• Seek error after retries are exhausted
• Track-follow error after retries are exhausted
• Read error after retries are exhausted
• Write error after retries are exhausted
Recovered errors will not be reported as diagnostic failures.
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5.2.5.2 Implementation
This section provides all of the information necessary to implement the DST function on this drive.
5.2.5.2.1 State of the drive prior to testing
The drive must be in a ready state before issuing the Send Diagnostic command. There are multiple reasons why a drive may not be
ready, some of which are valid conditions, and not errors. For example, a drive may be in process of doing a format, or another DST. It
is the responsibility of the host application to determine the “not ready” cause.
While not technically part of DST, a Not Ready condition also qualifies the drive to be returned to Seagate as a failed drive.
A Drive Not Ready condition is reported by the drive under the following conditions:
• Motor will not spin
• Motor will not lock to speed
• Servo will not lock on track
• Drive cannot read configuration tables from the disk
In these conditions, the drive responds to a Test Unit Ready command with an 02/04/00 or 02/04/03 code.
5.2.5.2.2 Invoking DST
To invoke DST, submit the Send Diagnostic command with the appropriate Function Code (001b for the short test or 010b for the
extended test) in bytes 1, bits 5, 6, and 7.
5.2.5.2.3 Short and extended tests
DST has two testing options:
1. short
2. extended
These testing options are described in the following two subsections.
Each test consists of three segments: an electrical test segment, a servo test segment, and a read/verify scan segment.
Short test (Function Code: 001b)
The purpose of the short test is to provide a time-limited test that tests as much of the drive as possible within 120 seconds. The
short test does not scan the entire media surface, but does some fundamental tests and scans portions of the media. A complete
read/verify scan is not performed and only factual failures will report a fault condition. This option provides a quick confidence test of
the drive.
Extended test (Function Code: 010b)
The objective of the extended test option is to empirically test critical drive components. For example, the seek tests and on-track
operations test the positioning mechanism. The read operation tests the read head element and the media surface. The write
element is tested through read/write/read operations. The integrity of the media is checked through a read/verify scan of the media.
Motor functionality is tested by default as a part of these tests.
The anticipated length of the Extended test is reported through the Control Mode page.
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5.2.5.2.4 Log page entries
When the drive begins DST, it creates a new entry in the Self-test Results Log page. The new entry is created by inserting a new self-
test parameter block at the beginning of the self-test results log parameter section of the log page. Existing data will be moved to
make room for the new parameter block. The drive reports 20 parameter blocks in the log page. If there are more than 20 parameter
blocks, the least recent parameter block will be deleted. The new parameter block will be initialized as follows:
1. The Function Code field is set to the same value as sent in the DST command
2. The Self-Test Results Value field is set to Fh
3. The drive will store the log page to non-volatile memory
After a self-test is complete or has been aborted, the drive updates the Self-Test Results Value field in its Self-Test Results Log page in
non-volatile memory. The host may use Log Sense to read the results from up to the last 20 self-tests performed by the drive. The
self-test results value is a 4-bit field that reports the results of the test. If the field is set to zero, the drive passed with no errors
detected by the DST. If the field is not set to zero, the test failed for the reason reported in the field.
The drive will report the failure condition and LBA (if applicable) in the Self-test Results Log parameter. The Sense key, ASC, ASCQ,
and FRU are used to report the failure condition.
5.2.5.2.5 Abort
There are several ways to abort a diagnostic. Users can use a SCSI Bus Reset or a Bus Device Reset message to abort the diagnostic.
Users can abort a DST executing in background mode by using the abort code in the DST Function Code field. This will cause a 01
(self-test aborted by the application client) code to appear in the self-test results values log. All other abort mechanisms will be
reported as a 02 (self-test routine was interrupted by a reset condition).
5.2.6 Product warranty
See “Seagate® Technology Support Services” on page 6 for warranty contact information.
Shipping
When transporting or shipping a drive, use only a Seagate-approved container. Keep the original box. Seagate approved containers
are easily identified by the Seagate Approved Package label. Shipping a drive in a non-approved container voids the drive warranty.
Seagate repair centers may refuse receipt of components improperly packaged or obviously damaged in transit. Contact the
authorized Seagate distributor to purchase additional boxes. Seagate recommends shipping by an air-ride carrier experienced in
handling computer equipment.
Storage
Maximum storage periods are 180 days within original unopened Seagate shipping package or 60 days unpackaged within the
defined non-operating limits (refer to environmental section in this manual). Storage can be extended to 1 year packaged or
unpackaged under optimal environmental conditions (25°C, <40% relative humidity non-condensing, and non-corrosive
environment). During any storage period the drive non-operational temperature, humidity, wet bulb, atmospheric conditions, shock,
vibration, magnetic and electrical field specifications should be followed.
Product repair and return information
Seagate customer service centers are the only facilities authorized to service Seagate drives. Seagate does not sanction any third-
party repair facilities. Any unauthorized repair or tampering with the factory seal voids the warranty.
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6.0 Physical/electrical specifications
This section provides information relating to the physical and electrical characteristics of the drive.
6.1 PowerChoiceTM power management
Drives using the load/unload architecture provide programmable power management to tailor systems for performance and greater
energy efficiency.
The table below lists the supported PowerChoice modes. The further down the user goes in the table, the more power savings the
user gets. For example, Idle_B mode results in greater power savings than Idle_A mode. Standby_Z mode results in the greatest
power savings.
PowerChoice modes
PowerChoiceTM can be invoked using one of these two methods:
• Power Condition mode page method—Enable and initialize the idle condition timers and/or the standby condition timers. The timer values are
based on the values set in the Power Condition mode page.
• START STOP UNIT command method—Use the START STOP UNIT command (OPERATION CODE 1Bh). This allows the host to directly transition the
drive to any supported PowerChoice mode.
If both the Power Condition mode page and START STOP UNIT command methods are used, the START STOP UNIT command request
takes precedence over the Power Condition mode page power control and may disable the idle condition and standby condition
timers. The REQUEST SENSE command reports the current PowerChoice state if active and also the method by which the drive
entered the PowerChoice state.
When the drive receives a command, all power condition timers are suspended if they were enabled via the Power Condition mode
page. Once all outstanding commands are processed, the power condition timers are reinitialized to the values defined in the Power
Condition mode page
6.1.1 PowerChoice reporting methods
PowerChoiceTM provides these reporting methods for tracking purposes:
Request Sense command reports
• Current power condition
• Method of entry.
Mode Sense command reports (mode page 0x1A)
• Idle conditions enabled / disabled
• Idle condition timer values (100ms increments) (default, saved, current, changeable)
Power Condition Vital Product Data (VPD) Page (VPD page 0x8A)
• Supported power conditions
• Typical recovery time from power conditions (1ms increments)
Start/Stop Cycle Counter Log Page reports (log page 0x0E)
• Specified and accumulated Start/Stops and Load/Unload cycles
Power Condition Transitions Log Page reports (log page 0x1A, subpage 0x00)
• Accumulated transitions to Active, Idle_A, Idle_B, Idle_C, Standby_Y, Standby_Z
Mode Description
Idle_A Reduced electronics
Idle_B Heads unloaded. Disks spinning at full RPM
Idle_C Heads unloaded. Disks spinning at reduced RPM
Standby_Y Heads unloaded. Disks spinning at reduced RPM. Recovery requires the NOTIFY (Enable Spinup) command.
Standby_Z Heads unloaded. Motor stopped (disks not spinning) Recovery requires the NOTIFY (Enable Spinup) command.
Note Processing the Request Sense command does not impact the drive’s power save state.
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6.2 AC power requirements
None.
6.3 DC power requirements
The voltage and current requirements for a single drive are shown below. Values indicated apply at the drive connector.
The standard drive models and the SED drive models have identical hardware, however the security and encryption portion of the
drive controller ASIC is enabled and functional in the SED models. This represents a small additional drain on the 5V supply of about
30mA and a commensurate increase of about 150mW in power consumption. There is no additional drain on the 12V supply.
Table 3 6TB drive DC power requirements
Notes
6.0Gb mode 12.0Gb mode
(Amps) (Amps) (Watts) (Amps) (Amps) (Watts)
Voltage +5V +12V [2] +5V +12V [2]
Regulation [5] ± 5% [2] ± 5% [2]
Avg idle current DCX [1] [7] 0.29 0.58 8.37 0.406 0.446 7.38
Advanced idle current
Idle A 0.29 0.58 8.37 0.399 0.445 7.33
Idle B 0.29 0.51 7.54 0.325 0.391 6.31
Idle C 0.30 0.29 4.95 0.334 0.234 4.48
Standby 0.28 0.01 1.46 0.315 0.005 1.63
Maximum starting current
(peak DC) DC [3] 0.60 2.04 27.48 0.722 2.003 27.65
(peak AC) AC [3] 0.78 2.77 1.056 2.680
Delayed motor start (max) DC [1] [4] 0.28 0.11 0.428 0.064
Operating current (random read 4K16Q)
Typical DCX [1] [6] 0.40 0.84 12.09 0.442 0.790 11.69
Maximum DC [1] 0.42 0.88 0.450 0.802
Maximum (peak) DC 1.28 2.52 1.120 2.356
Operating current (random write 4K16Q)
Typical DCX [1] 0.40 0.72 10.66 0.477 0.506 8.45
Maximum DC [1] 0.42 0.75 0.482 0.515
Maximum (peak) DC 1.27 2.53 0.835 2.358
Operating current (sequential read 64K16Q)
Typical DCX [1] 0.71 0.62 11.01 0.744 0.487 9.56
Maximum DC [1] 0.74 0.65 0.748 0.492
Maximum (peak) DC 0.96 3.02 1.074 1.824
Operating current (sequential write 64K16Q)
Typical DCX [1] 0.61 0.65 10.78 0.669 0.512 9.49
Maximum DC [1] 0.64 0.67 0.674 0.518
Maximum (peak) DC 0.82 2.19 0.906 0.913
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Table 4 4TB drive DC power requirements
Notes
6.0Gb mode 12.0Gb mode
(Amps) (Amps) (Watts) (Amps) (Amps) (Watts)
Voltage +5V +12V [2] +5V +12V [2]
Regulation [5] ± 5% [2] ± 5% [2]
Avg idle current DCX [1] [7] 0.33 0.41 6.52 0.401 0.380 6.56
Advanced idle current
Idle A 3s 0.33 0.41 6.52 0.390 0.378 6.48
Idle B 3s 0.33 0.36 5.96 0.317 0.340 5.67
Idle C 3s 0.34 0.21 4.23 0.326 0.208 4.13
Standby 3s 0.32 0.01 1.64 0.307 0.006 1.60
Maximum starting current
(peak DC) DC 3s [3] 0.68 2.13 28.96 0.727 2.080 28.60
(peak AC) AC 3s [3] 0.90 2.71 1.016 2.760
Delayed motor start (max) DC 3s [1] [4] 0.36 0.03 0.368 0.072
Operating current (random read 4K16Q)
Typical DCX [1] [6] 0.44 0.68 10.39 0.436 0.721 10.83
Maximum DC 3s [1] 0.52 0.72 0.441 0.726
Maximum (peak) DC 3s 1.54 2.38 1.155 2.313
Operating current (random write 4K16Q)
Typical DCX [1] 0.44 0.59 9.32 0.448 0.694 10.57
Maximum DC 3s [1] 0.54 0.74 0.455 0.703
Maximum (peak) DC 3s 1.60 2.38 0.743 2.295
Operating current (sequential read 64K16Q)
Typical DCX [1] 0.75 0.43 8.87 0.750 0.410 8.67
Maximum DC 3s [1] 0.86 0.45 0.757 0.414
Maximum (peak) DC 3s 1.12 2.58 0.988 1.824
Operating current (sequential write 64K16Q)
Typical DCX [1] 0.63 0.44 8.48 0.669 0.429 8.49
Maximum DC 3s [1] 0.74 0.47 0.678 0.433
Maximum (peak) DC 3s 0.88 0.87 0.920 0.840
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[1] Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these values. Power supply at nominal voltage. N
(number of drives tested) = 6, 35 Degrees C ambient.
[2] For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ± 5% before reaching 7200 RPM. The ± 5% must be main-
tained after the drive signifies that its power-up sequence has been completed and that the drive is able to accept selection by the host initia-
tor.
[3] See +12V current profile in Figure 1. (for 4TB models)
[4] This condition occurs after OOB and Speed Negotiation completes but before the drive has received the Notify Spinup primitive.
[5] See paragraph 6.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and transient response.
[6] Operating condition is defined as random 8 block reads.
[7] During idle, the drive heads are relocated every 60 seconds to a random location within the band from three-quarters to maximum track.
Table 5 2TB drive DC power requirements
Notes
6.0Gb mode 12.0Gb mode
(Amps) (Amps) (Watts) (Amps) (Amps) (Watts)
Voltage +5V +12V [2] +5V +12V [2]
Regulation [5] ± 5% [2] ± 5% [2]
Avg idle current DCX [1] [7] 0.30 0.26 4.57 0.421 0.246 5.06
Advanced idle current
Idle A 3s 0.31 0.26 4.60 0.411 0.246 5.02
Idle B 3s 0.29 0.23 4.21 0.337 0.222 4.35
Idle C 3s 0.31 0.15 3.32 0.346 0.143 3.45
Standby 3s 0.28 0.01 1.51 0.327 0.007 1.72
Maximum starting current
(peak DC) DC 3s [3] 0.54 2.03 27.06 0.746 2.047 28.29
(peak AC) AC 3s [3] 0.70 2.61 0.896 2.62
Delayed motor start (max) DC 3s [1] [4] 0.28 0.10 0.388 0.067
Operating current (random read 4K16Q)
Typical DCX [1] [6] 0.41 0.59 9.10 0.455 0.594 9.41
Maximum DC 3s [1] 0.43 0.61 0.476 0.599
Maximum (peak) DC 3s 1.23 2.33 1.15 2.114
Operating current (random write 4K16Q)
Typical DCX [1] 0.41 0.44 7.35 0.466 0.56 9.05
Maximum DC 3s [1] 0.44 0.58 0.485 0.568
Maximum (peak) DC 3s 1.50 2.15 0.758 2.113
Operating current (sequential read 64K16Q)
Typical DCX [1] 0.72 0.27 6.86 0.759 0.276 7.11
Maximum DC 3s [1] 0.75 0.29 0.782 0.279
Maximum (peak) DC 3s 0.98 1.99 1.039 1.824
Operating current (sequential write 64K16Q)
Typical DCX [1] 0.61 0.29 6.51 0.688 0.301 7.05
Maximum DC 3s [1] 0.65 0.30 0.708 0.306
Maximum (peak) DC 3s 0.82 2.91 0.902 0.674
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General DC power requirement notes.
1. Minimum current loading for each supply voltage is not less than 1.7% of the maximum operating current shown.
2. The +5V and +12V supplies should employ separate ground returns.
3. Where power is provided to multiple drives from a common supply, careful consideration for individual drive power requirements should be
noted. Where multiple units are powered on simultaneously, the peak starting current must be available to each device.
4. Parameters, other than spindle start, are measured after a 10-minute warm up.
5. No terminator power.
6.3.1 Conducted noise immunity
Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 MHz. Maximum allowed noise
values given below are peak-to-peak measurements and apply at the drive power connector.
6.3.2 Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up and down.
6.3.3 Current profiles
The +12V (top) and +5V (bottom) current profiles for the Exos 7E8 drives are shown below.
Figure 1. 6TB model current profiles
+5v = 250 mV pp from 100 Hz to 20 MHz.
+12v = 800 mV pp from 100 Hz to 8 KHz.
450 mV pp from 8 KHz to 20 KHz.
250 mV pp from 20 KHz to 5 MHz.
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The +12V (top) and +5V (bottom) current profiles for the Exos 7E8 drives are shown below.
Figure 2. 4TB model current profiles
The +12V (top) and +5V (bottom) current profiles for the Exos 7E8 drives are shown below.
Figure 3. 2TB model current profiles
Note All times and currents are typical. See Table 5 for maximum current requirements.
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6.4 Power dissipation
6TB models in 12Gb operation
Please refer to Table 3 for power dissipation numbers.
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 4.). Locate the typical
I/O rate for a drive in the system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts
on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123.
Figure 4. 6TB models (12Gb) DC current and power vs. input/output operations per second
4TB models in 12Gb operation
Please refer to Table 4 for power dissipation numbers.
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 4.). Locate the typical
I/O rate for a drive in the system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts
on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123.
Figure 5. 4TB models (12Gb) DC current and power vs. input/output operations per second
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2TB models in 12Gb operation
Please refer to Table 5 for power dissipation numbers.
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 4.). Locate the typical
I/O rate for a drive in the system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts
on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123.
Figure 6. 2TB models (12Gb) DC current and power vs. input/output operations per second
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6.5 Environmental limits
Temperature and humidity values experienced by the drive must be such that condensation does not occur on any drive part.
Altitude and atmospheric pressure specifications are referenced to a standard day at 58.7°F (14.8°C).
6.5.1 Temperature
a. Operating
The drive meets the operating specifications over a 41°F to 140°F (5°C to 60°C) drive case temperature range with a maximum
temperature gradient of 36°F (20°C) per hour.
The maximum allowable drive case temperature is 140°F (60°C).
Air flow may be required to achieve consistent nominal case temperature values (see Section 10.2). To confirm that the required
cooling is provided for the electronics and HDA, place the drive in its final mechanical configuration, and perform random write/
read operations. After the temperatures stabilize, measure the case temperature of the drive. See Figure 7 for HDA case
temperature measurement location.
b. Non-operating
–40° to 158°F (–40° to 70°C) package ambient with a maximum gradient of 36°F (20°C) per hour. This specification assumes that
the drive is packaged in the shipping container designed by Seagate for use with drive.
Figure 7. Location of the HDA temperature check point
6.5.2 Humidity
The values below assume that no condensation on the drive occurs. Maximum wet bulb temperature is 84.2°F (29°C).
a. Operating
5% to 95% non-condensing relative humidity with a maximum gradient of 20% per hour.
b. Non-operating
5% to 95% non-condensing relative humidity.
6.5.3 Effective altitude (sea level)
a. Operating
–1000 to +10,000 feet (–304.8 to +3048 meters)
b. Non-operating
–1000 to +40,000 feet (–304.8 to +12,192 meters)
Note To maintain optimal performance drives should be run at nominal drive temperatures
and humidity
Note Image is for reference only, may not represent actual
drive.
HDA Temp.
Check Point
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6.5.4 Shock and vibration
Shock and vibration limits specified in this document are measured directly on the drive chassis. If the drive is installed in an
enclosure to which the stated shock and/or vibration criteria is applied, resonances may occur internally to the enclosure resulting in
drive movement in excess of the stated limits. If this situation is apparent, it may be necessary to modify the enclosure to minimize
drive movement.
The limits of shock and vibration defined within this document are specified with the drive mounted by any of the four methods
shown in Figure 8, and in accordance with the restrictions of Section 10.3.
6.5.4.1 Shock
a. Operating—normal
The drive, as installed for normal operation, shall operate error free while subjected to intermittent shock not exceeding 70 Gs
(read) and 40 Gs (write) at a maximum duration of 2ms (half sinewave). Shock may be applied in the X, Y, or Z axis. Shock is not to
be repeated more than once every 2 seconds.
b. Operating—abnormal
Equipment, as installed for normal operation, does not incur physical damage while subjected to intermittent shock not
exceeding 40 Gs at a maximum duration of 11ms (half sinewave). Shock occurring at abnormal levels may promote degraded
operational performance during the abnormal shock period. Specified operational performance will continue when normal
operating shock levels resume. Shock may be applied in the X, Y, or Z axis. Shock is not to be repeated more than once every 2
seconds.
c. Non-operating
The limits of non-operating shock shall apply to all conditions of handling and transportation. This includes both isolated drives
and integrated drives.
The drive subjected to nonrepetitive shock not exceeding 80 Gs at a maximum duration of 11ms (half sinewave) shall not exhibit
device damage or performance degradation. Shock may be applied in the X, Y, or Z axis.
The drive subjected to nonrepetitive shock not exceeding 250 Gs at a maximum duration of 2ms (half sinewave) does not exhibit
device damage or performance degradation. Shock may be applied in the X, Y, or Z axis.
The drive subjected to nonrepetitive shock not exceeding 200 Gs at a maximum duration of 0.5ms (half sinewave) does not
exhibit device damage or performance degradation. Shock may be applied in the X, Y, or Z axis.
d. Packaged
Disk drives shipped as loose load (not palletized) general freight will be packaged to withstand drops from heights as defined in
the table below. For additional details refer to Seagate specifications 30190-001 (under 100 lbs/45 kg) or 30191-001 (over 100 lbs/
45 Kg).
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Drives packaged in single or multipacks with a gross weight of 20 pounds (8.95 kg) or less by Seagate for general freight
shipment shall withstand a drop test from 48 in (1070 mm) against a concrete floor or equivalent.
Figure 8. Recommended mounting
Package size Packaged/product weight Drop height
<600 cu in (<9,800 cu cm) Any 60 in (1524 mm)
600-1800 cu in (9,800-19,700 cu cm) 0-20 lb (0 to 9.1 kg) 48 in (1219 mm)
>1800 cu in (>19,700 cu cm) 0-20 lb (0 to 9.1 kg) 42 in (1067 mm)
>600 cu in (>9,800 cu cm) 20-40 lb (9.1 to 18.1 kg) 36 in (914 mm)
Note Image is for reference only, may not represent actual
drive.
Z
Y
X
ZY
X
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6.5.4.2 Vibration
a. Operating—normal
The drive as installed for normal operation, shall comply with the complete specified performance while subjected to continuous
vibration not exceeding
5 - 22 Hz 0.25 Gs, limited displacement
22 - 350 Hz 0.5 Gs
350 - 500 Hz 0.25 Gs
Vibration may be applied in the X, Y, or Z axis.
b. Operating—abnormal
Equipment as installed for normal operation shall not incur physical damage while subjected to periodic vibration not exceeding:
15 minutes of duration at major resonant frequency
Vibration occurring at these levels may degrade operational performance during the abnormal vibration period. Specified
operational performance will continue when normal operating vibration levels are resumed. This assumes system recovery
routines are available.
Operating abnormal translational random flat profile
5-500 Hz @ 0.75 G (X, Y, or Z axis)
c. Non-operating
The limits of non-operating vibration shall apply to all conditions of handling and transportation. This includes both isolated
drives and integrated drives.
The drive shall not incur physical damage or degraded performance as a result of continuous vibration not exceeding
5 - 22 Hz 3 Gs (0 to peak, linear, swept sine, 0.5 octave/min)
22 - 350 Hz 3 Gs (0 to peak, linear, swept sine, 0.5 octave/min)
350 - 500 Hz 3 Gs (0 to peak, linear, swept sine, 0.5 octave/min)
Vibration may be applied in the X, Y, or Z axis.
6.5.5 Acoustics
Sound power during idle mode shall be 2.8 bels typical when measured to ISO 7779 specification.
Sound power while operating shall be 3.0 bels typical when measured to ISO 7779 specification.
There will not be any discrete tones more than 9 dB above the masking noise when measured according to
Seagate specification 30553-001.
6.5.6 Air cleanliness
The drive is designed to operate in a typical office environment with minimal environmental control.
6.5.7 Corrosive environment
Seagate electronic drive components pass accelerated corrosion testing equivalent to 10 years exposure to light industrial
environments containing sulfurous gases, chlorine and nitric oxide, classes G and H per ASTM B845. However, this accelerated testing
cannot duplicate every potential application environment.
Users should use caution exposing any electronic components to uncontrolled chemical pollutants and corrosive chemicals as
electronic drive component reliability can be affected by the installation environment. The silver, copper, nickel and gold films used
in hard disk drives are especially sensitive to the presence of sulfide, chloride, and nitrate contaminants. Sulfur is found to be the
most damaging. Materials used in cabinet fabrication, such as vulcanized rubber, that can outgas corrosive compounds should be
minimized or eliminated. The useful life of any electronic equipment may be extended by replacing materials near circuitry with
sulfide-free alternatives.
Seagate recommends that data centers be kept clean by monitoring and controlling the dust and gaseous contamination. Gaseous
contamination should be within ANSI/ISA S71.04-2013 G2 classification levels (as measured on copper and silver coupons), and dust
contamination to ISO 14644-1 Class 8 standards, and MTBF rated conditions as defined in the Annualized Failure Rate (AFR) and
Mean Time Between Failure (MTBF) section.
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6.5.8 Electromagnetic susceptibility
See Section 2.1.2.1.
6.6 Mechanical specifications
Refer to Figure 9 for detailed mounting configuration dimensions. See Section 10.3, “Drive mounting.”
Figure 9. Mounting configuration dimensions
Weight:
6TB 1.55 lb 705 g
4TB 1.500 lb 680 g
2TB 1.340 lb 610 g
Note
These dimensions conform to the Small Form Factor Standard
documented in SFF-8301 and SFF-8323, found at
www.sffcommittee.org.
Note The image is for mechanical dimension reference only and may not represent the
actual drive.
2X 1.750±.010
2X 1.625±.010
4.000±.010
3.750±.010
1.432±.019
2
.128±.010 .814±.020
2
C
L
OF DRIVE
C
L
OF CONN
4X 6-32 UNC 2B
3 MIN THREAD DEPTH
.14 MAX FASTENER PENETRATION
MOUNTING HOLES BOTH SIDES.
MAX TORQUE 6 IN/LBS
Y
5.787 MAX
146.99 MM
2X 4.000±.010
2X 1.638±.010
2X 1.122±.010
.250±.010
6X 6-32 UNC 2B
3 MIN THREAD DEPTH
.14 MAX FASTENER PENETRATION
MOUNTING HOLES BOTH SIDES.
MAX TORQUE 6 IN/LBS
Z
Y
1.028 MAX
26.11 MM
.138±.015
2
2.000
C
L
OF DRIVE
Z
TEMPERATURE
CHECKPOINT 60°C MAX
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7.0 About FIPS
The Federal Information Processing Standard (FIPS) Publication 140-2 is a U.S. Government Computer Security Standard used to
accredit cryptographic modules. It is titled 'Security Requirements for Cryptographic Modules (FIPS PUB 140-2)' and is issued by the
National Institute of Standards and Technology (NIST).
Purpose
This standard specifies the security requirements that will be satisfied by a cryptographic module utilized within a security system
protecting sensitive but unclassified information. The standard provides four increasing, qualitative levels of security: Level 1, Level 2,
Level 3 and Level 4. These levels are intended to cover the wide range of potential applications and environments in which
cryptographic modules may be employed.
Validation Program
Products that claim conformance to this standard are validated by the Cryptographic Module Validation Program (CMVP) which is a
joint effort between National Institute of Standards and Technology (NIST) and the Communications Security Establishment (CSE) of
the Government of Canada. Products validated as conforming to FIPS 140-2 are accepted by the Federal agencies of both countries
for the protection of sensitive information (United States) or Designated Information (Canada).
In the CMVP, vendors of cryptographic modules use independent, accredited testing laboratories to have their modules tested.
National Voluntary Laboratory Accreditation Program (NVLAP) accredited laboratories perform cryptographic module compliance/
conformance testing.
Seagate Enterprise SED
The SEDs referenced in this Product Manual have been validated by CMVP and have been thoroughly tested by a NVLAP accredited
lab to satisfy FIPS 140-2 Level 2 requirements. In order to operate in FIPS Approved Mode of Operation, these SEDs require security
initialization. For more information, refer to 'Security Rules' section in the 'Security Policy' document uploaded on the NIST website.
To reference the product certification visit - http://csrc.nist.gov/groups/STM/cmvp/documents/140-1/1401vend.htm, and search for
“Seagate”.
Security Level 2
Security Level 2 enhances the physical security mechanisms of a Security Level 1 cryptographic module by adding the require-
ment for tamper-evidence, which includes the use of tamper-evident coatings or seals on removable covers of the module. Tam-
per-evident coatings or seals are placed on a cryptographic module so that the coating or seal must be broken to attain physical
access to the critical security parameters (CSP) within the module. Tamper-evident seals (example shown in Figure 10, page 38) are
placed on covers to protect against unauthorized physical access. In addition Security Level 2 requires, at a minimum, role-based
authentication in which a cryptographic module authenticates the authorization of an operator to assume a specific role and per-
form a corresponding set of services.
Figure 10. Example of FIPS tamper evidence labels.
Note Image is for reference only, may not represent actual drive.
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8.0 About self-encrypting drives
Self-encrypting drives (SEDs) offer encryption and security services for the protection of stored data, commonly known as
“protection of data at rest.” These drives are compliant with the Trusted Computing Group (TCG) Enterprise Storage Specifications as
detailed in Section 2.3.
The Trusted Computing Group (TCG) is an organization sponsored and operated by companies in the computer, storage and digital
communications industry. Seagate’s SED models comply with the standards published by the TCG.
To use the security features in the drive, the host must be capable of constructing and issuing the following two SCSI commands:
• Security Protocol Out
• Security Protocol In
These commands are used to convey the TCG protocol to and from the drive in their command payloads.
8.1 Data encryption
Encrypting drives use one inline encryption engine for each port, employing AES-256 bit data encryption in AES-XTS mode to
encrypt all data prior to being written on the media and to decrypt all data as it is read from the media. The encryption engines are
always in operation and cannot be disabled. The 32-byte Data Encryption Key (DEK) is a random number which is generated by the
drive, never leaves the drive, and is inaccessible to the host system. The DEK is itself encrypted when it is stored on the media and
when it is in volatile temporary storage (DRAM) external to the encryption engine. A unique data encryption key is used for each of
the drive's possible16 data bands (see Section 8.5).
8.2 Controlled access
The drive has two security providers (SPs) called the "Admin SP" and the "Locking SP." These act as gatekeepers to the drive security
services. Security-related commands will not be accepted unless they also supply the correct credentials to prove the requester is
authorized to perform the command.
8.2.1 Admin SP
The Admin SP allows the drive's owner to enable or disable firmware download operations (see Section 8.4). Access to the Admin SP
is available using the SID (Secure ID) password or the MSID (Manufacturers Secure ID) password.
8.2.2 Locking SP
The Locking SP controls read/write access to the media and the cryptographic erase feature. Access to the Locking SP is available
using the BandMasterX or EraseMaster passwords. Since the drive owner can define up to 16 data bands on the drive, each data band
has its own password called BandMasterX where X is the number of the data band (0 through 15).
8.2.3 Default password
When the drive is shipped from the factory, all passwords are set to the value of MSID. This 32-byte random value can only be read by
the host electronically over the interface. After receipt of the drive, it is the responsibility of the owner to use the default MSID
password as the authority to change all other passwords to unique owner-specified values.
8.3 Random number generator (RNG)
The drive has a 32-byte hardware RNG that it is uses to derive encryption keys or, if requested to do so, to provide random numbers
to the host for system use, including using these numbers as Authentication Keys (passwords) for the drive’s Admin and Locking SPs.
8.4 Drive locking
In addition to changing the passwords, as described in Section 8.2.3, the owner should also set the data access controls for the
individual bands.
The variable "LockOnReset" should be set to "PowerCycle" to ensure that the data bands will be locked if power is lost. In addition
"ReadLockEnabled" and "WriteLockEnabled" must be set to true in the locking table in order for the bands "LockOnReset" setting of
"PowerCycle" to actually lock access to the band when a "PowerCycle" event occurs. This scenario occurs if the drive is removed from
its cabinet. The drive will not honor any data read or write requests until the bands have been unlocked. This prevents the user data
from being accessed without the appropriate credentials when the drive has been removed from its cabinet and installed in another
system.
When the drive is shipped from the factory, the firmware download port is unlocked.
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8.5 Data bands
When shipped from the factory, the drive is configured with a single data band called Band 0 (also known as the Global Data Band)
which comprises LBA 0 through LBA max. The host may allocate Band1 by specifying a start LBA and an LBA range. The real estate for
this band is taken from the Global Band. An additional 14 Data Bands may be defined in a similar way (Band2 through Band15) but
before these bands can be allocated LBA space, they must first be individually enabled using the EraseMaster password.
Data bands cannot overlap but they can be sequential with one band ending at LBA (x) and the next beginning at LBA (x+1).
Each data band has its own drive-generated encryption key and its own user-supplied password. The host may change the
Encryption Key (see Section 8.6) or the password when required. The bands should be aligned to 4K LBA boundaries.
8.6 Cryptographic erase
A significant feature of SEDs is the ability to perform a cryptographic erase. This involves the host telling the drive to change the data
encryption key for a particular band. Once changed, the data is no longer recoverable since it was written with one key and will be
read using a different key. Since the drive overwrites the old key with the new one, and keeps no history of key changes, the user
data can never be recovered. This is tantamount to an instantaneous data erase and is very useful if the drive is to be scrapped or
redispositioned.
8.7 Authenticated firmware download
In addition to providing a locking mechanism to prevent unwanted firmware download attempts, the drive also only accepts
download files which have been cryptographically signed by the appropriate Seagate Design Center.
Three conditions must be met before the drive will allow the download operation:
1. The download must be an SED file. A standard (base) drive (non-SED) file will be rejected.
2. The download file must be signed and authenticated.
3. As with a non-SED drive, the download file must pass the acceptance criteria for the drive. For example it must be applicable to the correct
drive model, and have compatible revision and customer status.
8.8 Power requirements
The standard drive models and the SED drive models have identical hardware, however the security and encryption portion of the
drive controller ASIC is enabled and functional in the SED models. This represents a small additional drain on the 5V supply of about
30mA and a commensurate increase of about 150mW in power consumption. There is no additional drain on the 12V supply. See the
tables in Section 6.3 for power requirements on the standard (non-SED) drive models.
8.9 Supported commands
The SED models support the following two commands in addition to the commands supported by the standard (non-SED) models as
listed in table 9:
• Security Protocol Out (B5h)
• Security Protocol In (A2h)
8.10 Sanitize - CRYPTOGRAPHIC ERASE
This command cryptographically erases all user data on the drive by destroying the current data encryption key and replacing it with
a new data encryption key randomly generated by the drive. Sanitize CRYPTOGRAPHIC ERASE is a SCSI CDB Op code 48h and
selecting the service action code 3 (CRYPTOGRAPHIC ERASE)
8.11 RevertSP
SED models will support the RevertSP feature which erases all data in all bands on the device and returns the contents of all SPs
(Security Providers) on the device to their original factory state. In order to execute the RevertSP method the unique PSID (Physical
Secure ID) printed on the drive label must be provided. PSID is not electronically accessible and can only be manually read from the
drive label or scanned in via the 2D barcode.
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9.0 Defect and error management
Seagate continues to use innovative technologies to manage defects and errors. These technologies are designed to increase data
integrity, perform drive self-maintenance, and validate proper drive operation.
SCSI defect and error management involves drive internal defect/error management and SAS system error considerations (errors in
communications between the initiator and the drive). In addition, Seagate provides the following technologies used to increase data
integrity and drive reliability:
• Background Media Scan (see Section 9.4)
• Media Pre-Scan (see Section 9.5)
• Deferred Auto-Reallocation (see Section 9.6)
• Idle Read After Write (see Section 9.7)
The read error rates and specified storage capacities are not dependent on host (initiator) defect management routines.
9.1 Drive internal defects/errors
During the initial drive format operation at the factory, media defects are identified, tagged as being unusable, and their locations
recorded on the drive primary defects list (referred to as the “P’ list and also as the ETF defect list). At factory format time, these
known defects are also reallocated, that is, reassigned to a new place on the medium and the location listed in the defects
reallocation table. The “P” list is not altered after factory formatting. Locations of defects found and reallocated during error recovery
procedures after drive shipment are listed in the “G” list (defects growth list). The “P” and “G” lists may be referenced by the initiator
using the Read Defect Data command.
Details of the SCSI commands supported by the drive are described in the SAS Interface Manual. Also, more information on the drive
Error Recovery philosophy is presented in the SAS Interface Manual.
9.2 Drive error recovery procedures
When an error occurs during drive operation, the drive, if programmed to do so, performs error recovery procedures to attempt to
recover the data. The error recovery procedures used depend on the options previously set in the Error Recovery Parameters mode
page. Error recovery and defect management may involve using several SCSI commands described in the SAS Interface Manual. The
drive implements selectable error recovery time limits required in video applications.
The error recovery scheme supported by the drive provides a way to control the total error recovery time for the entire command in
addition to controlling the recovery level for a single LBA. The total amount of time spent in error recovery for a command can be
limited using the Recovery Time Limit bytes in the Error Recovery mode page. The total amount of time spent in error recovery for a
single LBA can be limited using the Read Retry Count or Write Retry Count bytes in the Error Recovery mode page.
The drive firmware error recovery algorithms consist of 12 levels for read recoveries and five levels for write. Each level may consist of
multiple steps, where a step is defined as a recovery function involving a single re-read or re-write attempt. The maximum level used
by the drive in LBA recovery is determined by the read and write retry counts.
Table 6 equates the read and write retry count with the maximum possible recovery time for read and write recovery of individual
LBAs. The times given do not include time taken to perform reallocations. Reallocations are performed when the ARRE bit (for reads)
or AWRE bit (for writes) is one, the RC bit is zero, and the recovery time limit for the command has not yet been met. Time needed to
perform reallocation is not counted against the recovery time limit.
When the RC bit is one, reallocations are disabled even if the ARRE or AWRE bits are one. The drive will still perform data recovery
actions within the limits defined by the Read Retry Count, Write Retry Count, and Recovery Time Limit parameters. However, the
drive does not report any unrecovered errors.
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* For read retry count, every tick ~ 5% of total error recovery. Valid range setting is 1-20.
e.g. 1 ~ 5%
5 ~ 25%
20 ~ 100%
Setting these retry counts to a value below the default setting could result in degradation of the unrecovered error rate. For example,
suppose the read/write recovery page has the RC bit = 0 and if the read retry count is set to 5, this means ~ 25% of error recovery will
be executed which consumes 621.62 ms (please refer to the table above). If the limit is reached and a LBA has not yet been recovered
(i.e. requires retries beyond 621.62 ms), the command will end with Check Condition status report and unrecoverable read error will
be reported.
9.3 SAS system errors
Information on the reporting of operational errors or faults across the interface is given in the SAS Interface Manual. The SSP
Response returns information to the host about numerous kinds of errors or faults. The Receive Diagnostic Results reports the results
of diagnostic operations performed by the drive.
Status returned by the drive to the initiator is described in the SAS Interface Manual. Status reporting plays a role in systems error
management and its use in that respect is described in sections where the various commands are discussed.
Table 6 Read and write retry count maximum recovery times
Read retry count*
Maximum recovery time per
LBA (cumulative, ms) Write retry count
Maximum recovery time per
LBA (cumulative, ms)
0 35.94
1 124.32 1 53.91
5 621.62 2 79.89
10 1243.23 3 97.86
15 1864.85 4 175.85
20 (default) 2486.47 5 (default) 421.79
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9.4 Background Media Scan
Background Media Scan (BMS) is a self-initiated media scan. BMS is defined in the T10 document SPC-4 available from the T10
committee. BMS performs sequential reads across the entire pack of the media while the drive is idle. In RAID arrays, BMS allows hot
spare drives to be scanned for defects prior to being put into service by the host system. On regular duty drives, if the host system
makes use of the BMS Log Page, it can avoid placing data in suspect locations on the media. Unreadable and recovered error sites will
be logged or reallocated per ARRE/AWRE settings.
With BMS, the host system can consume less power and system overhead by only checking BMS status and results rather than tying
up the bus and consuming power in the process of host-initiated media scanning activity.
Since the background scan functions are only done during idle periods, BMS causes a negligible impact to system performance. The
first BMS scan for a newly manufactured drive is performed as quickly as possible to verify the media and protect data by setting the
“Start time after idle” to 5ms, all subsequent scans begin after 500ms of idle time. Other features that normally use idle time to
function will function normally because BMS functions for bursts of 800ms and then suspends activity for 100ms to allow other
background functions to operate.
BMS interrupts immediately to service host commands from the interface bus while performing reads. BMS will complete any BMS-
initiated error recovery prior to returning to service host-initiated commands. Overhead associated with a return to host-servicing
activity from BMS only impacts the first command that interrupted BMS, this results in a typical delay of about 1 ms.
9.5 Media Pre-Scan
Media Pre-Scan is a feature that allows the drive to repair media errors that would otherwise have been found by the host system
during critical data accesses early in the drive’s life. The default setting for Media Pre-Scan is enabled on standard products. Media
Pre-Scan checks each write command to determine if the destination LBAs have been scanned by BMS. If the LBAs have been
verified, the drive proceeds with the normal write command. If the LBAs have not been verified by BMS, Pre-Scan will convert the
write to a write verify to certify that the data was properly written to the disk.
To expedite the scan of the full pack and subsequently exit from the Pre-Scan period, BMS will begin scanning immediately when the
drive goes to idle during the Pre-Scan period. In the event that the drive is in a high transaction traffic environment and is unable to
complete a BMS scan within 24 power on hours BMS will disable Pre-Scan to restore full performance to the system.
9.6 Deferred Auto-Reallocation
Deferred Auto-Reallocation (DAR) simplifies reallocation algorithms at the system level by allowing the drive to reallocate
unreadable locations on a subsequent write command. Sites are marked for DAR during read operations performed by the drive.
When a write command is received for an LBA marked for DAR, the auto-reallocation process is invoked and attempts to rewrite the
data to the original location. If a verification of this rewrite fails, the sector is re-mapped to a spare location.
This is in contrast to the system having to use the Reassign Command to reassign a location that was unreadable and then generate
a write command to rewrite the data. DAR is most effective when AWRE and ARRE are enabled—this is the default setting from the
Seagate factory. With AWRE and ARRE disabled DAR is unable to reallocate the failing location and will report an error sense code
indicating that a write command is being attempted to a previously failing location.
9.7 Idle Read After Write
Idle Read After Write (IRAW) utilizes idle time to verify the integrity of recently written data. During idle periods, no active system
requests, the drive reads recently written data from the media and compares it to valid write command data resident in the drives
data buffer. Any sectors that fail the comparison result in the invocation of a rewrite and auto-reallocation process. The process
attempts to rewrite the data to the original location. If a verification of this rewrite fails, the sector is re-mapped to a spare location.
Note
During Pre-Scan write verify commands, write performance may decrease by 50% until Pre-Scan
completes. Write performance testing should be performed after Pre-Scan is complete. This may be
checked by reading the BMS status.
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9.8 Protection Information (PI)
Protection Information is intended as a standardized approach to system level LRC traditionally provided by systems using 520 byte
formatted LBAs. Drives formatted with PI information provide the same, common LBA count (i.e. same capacity point) as non-PI
formatted drives. Sequential performance of a PI drive will be reduced by approximately 1.56% due to the extra overhead of PI being
transferred from the media that is not calculated as part of the data transferred to the host. To determine the full transfer rate of a PI
drive, transfers should be calculated by adding the 8 extra bytes of PI to the transferred LBA length, i.e. 512 + 8 = 520. PI formatted
drives are physically formatted to 520 byte sectors that store 512 bytes of customer data with 8 bytes of Protection Information
appended to it. The advantage of PI is that the Protection Information bits can be managed at the HBA and HBA driver level. Allowing
a system that typically does not support 520 LBA formats to integrate this level of protection.
Protection Information is valid with any supported LBA size. 512 LBA size is used here as common example.
9.8.1 Levels of PI
There are 4 types of Protection Information.
Type 0 - Describes a drive that is not formatted with PI information bytes. This allows for legacy support in non-PI systems.
Type 1 - Provides support of PI protection using 10 and 16 byte commands. The RDPROTECT and WRTPROTECT bits allow for
checking control through the CDB. Eight bytes of Protection Information are transmitted at LBA boundaries across the interface if
RDPROTECT and WRTPROTECT bits are nonzero values. Type 1 does not allow the use of 32 byte commands.
Type 2 - Provides checking control and additional expected fields within the 32 byte CDBs. Eight bytes of Protection Information are
transmitted at LBA boundaries across the interface if RDPROTECT and WRTPROTECT bits are nonzero values. Type 2 does allow the
use of 10 and 16 byte commands with zero values in the RDPROTECT and WRTPROTECT fields. The drive will generate 8 bytes
(e.g.0xFFFF) 8 bytes of Protection Information to be stored on the media, but the 8 bytes will not be transferred to the host during a
read command.
Type 3 - Seagate products do not support Type 3.
9.8.2 Setting and determining the current Type Level
A drive is initialized to a type of PI by using the format command on a PI capable drive. Once a drive is formatted to a PI Type, it may
be queried by a Read Capacity (16) command to report the PI type which it is currently formatted to. PI Types cannot coexist on a
single drive. A drive can only be formatted to a single PI Type. It can be changed at anytime to a new Type but requires a low level
format which destroys all existing data on the drive. No other vehicle for changing the PI type is provided by the T10 SBC3
specification.
Type 1 PI format CDB command: 04 90 00 00 00 00, Write Buffer: 00 A0 00 00
Type 2 PI format CDB command: 04 D0 00 00 00 00, Write Buffer: 00 A0 00 00
9.8.3 Identifying a Protection Information drive
The Standard Inquiry provides a bit to indicate if PI is support by the drive. Vital Product Descriptor (VPD) page 0x86 provides bits to
indicate the PI Types supported and which PI fields the drive supports checking.
Note
For further details with respect to PI, please refer to
SCSI Block Commands - 3 (SBC-3) Draft Standard
documentation.
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10.0 Installation
Seagate Exos 7E8 SAS disk drive installation is a plug-and-play process. There are no jumpers, switches, or terminators on the drive.
SAS drives are designed to be used in a host system that provides a SAS-compatible backplane with bays designed to accommodate
the drive. In such systems, the host system typically provides a carrier or tray into which users need to mount the drive. Mount the
drive to the carrier or tray provided by the host system only using 6-32 UNC mounting screws. The screws should be inserted no
more than 0.140 in (3.56mm) into the bottom or side mounting holes. When tightening the screws, do not overtighten use a
maximum torque of 6 in-lb. Users can mount the drive in any orientation.
Slide the carrier or tray into the appropriate bay in the host system using the instructions provided by the host system. This connects
the drive directly to the system’s SAS connector. The SAS connector is normally located on a SAS backpanel. See Section 11.4.1 for
additional information about these connectors.
Power is supplied through the SAS connector.
The drive is shipped from the factory low-level formatted in 512-byte logical blocks. Users need to reformat the drive only if selecting
a different logical block size.
Figure 11. Physical interface
10.1 Drive orientation
The drive may be mounted in any orientation. All drive performance characterizations, however, have been done with the drive in
horizontal (discs level) and vertical (drive on its side) orientations, which are the two preferred mounting orientations.
Note
SAS drives are designed to be attached to the host system without I/O or power
cables. If users intend the use the drive in a non-backplane host system, connecting
the drive using high-quality cables is acceptable as long as the I/O cable length does
not exceed 4 meters (13.1 feet).
Note Image is for reference only, may not represent actual
drive.
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10.2 Cooling
Cabinet cooling must be designed by the customer so that the ambient temperature immediately surrounding the drive will not
exceed temperature conditions specified in Section 6.5.1, "Temperature."
The rack, cabinet, or drawer environment for the drive must provide heat removal from the electronics and head and disk assembly
(HDA). Users should confirm that adequate heat removal is provided using the temperature measurement guidelines described in
Section 6.5.1.
Forced air flow may be required to keep temperatures at or below the temperatures specified in Section 6.5.1 in which case the drive
should be oriented, or air flow directed, so that the least amount of air flow resistance is created while providing air flow to the
electronics and HDA. Also, the shortest possible path between the air inlet and exit should be chosen to minimize the travel length of
air heated by the drive and other heat sources within the rack, cabinet, or drawer environment.
If forced air is determined to be necessary, possible air-flow patterns are shown in Figure 12. The air-flow patterns are created by one
or more fans, either forcing or drawing air as shown in the illustrations. Conduction, convection, or other forced air-flow patterns are
acceptable as long as the temperature measurement guidelines of Section 6.5.1 are met.
Figure 12. Air flow
Note Image is for reference only, may not represent actual
drive.
Above unit
Under unit
Note. Air flows in the direction shown (back to front)
or in reverse direction (front to back)
Above unit
Under unit
Note. Air flows in the direction shown or
in reverse direction (side to side)
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10.3 Drive mounting
Mount the drive using the bottom or side mounting holes. If mounting the drive using the bottom holes, ensure the drive is not
physically distorted by attempting to mount it on a stiff, non-flat surface.
The allowable mounting surface stiffness is 80 lb/in (14.0 N/mm). The following equation and paragraph define the allowable
mounting surface stiffness:
where K is the mounting surface stiffness (units in lb/in or N/mm) and X is the out-of-plane surface distortion (units in inches or
millimeters). The out-of-plane distortion (X) is determined by defining a plane with three of the four mounting points fixed and
evaluating the out-of-plane deflection of the fourth mounting point when a known force (F) is applied to the fourth point.
Figure 13. Breather hole location - top cover
10.4 Grounding
Signal ground (PCBA) and HDA ground are connected together in the drive and cannot be separated by the user. The equipment in
which the drive is mounted is connected directly to the HDA and PCBA with no electrically isolating shock mounts. If it is desired for
the system chassis to not be connected to the HDA/PCBA ground, the systems integrator or user must provide a nonconductive
(electrically isolating) method of mounting the drive in the host equipment.
Increased radiated emissions may result if users do not provide the maximum surface area ground connection between system
ground and drive ground. This is the system designer’s and integrator’s responsibility.
Note Do not cover breather hole on top
cover.
K x X = F < 15lb = 67N
Breather Hole
Do Not
Cover
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11.0 Interface requirements
This section partially describes the interface requirements as implemented on Seagate Exos 7E8 SAS drives. Additional information is
provided in the SAS Interface Manual (part number 100293071).
11.1 SAS features
This section lists the SAS-specific features supported by Seagate Exos 7E8 SAS drives.
11.1.1 task management functions
Table 7 lists the SAS task management functions supported.
11.1.2 task management responses
Table 8 lists the SAS response codes returned for task management functions supported.
11.2 Dual port support
Seagate Exos 7E8 SAS SAS drives have two independent ports. These ports may be connected in the same or different SCSI domains.
Each drive port has a unique SAS address.
The two ports have the capability of independent port clocking (e.g. both ports can run at 12Gb/s or the first port can run at 6Gb/s
while the second port runs at 3Gb/s.) The supported link rates are 3.0, 6.0, or 12.0 Gb/s.
Subject to buffer availability, the Seagate Exos 7E8 SAS drives support:
• Concurrent port transfers—The drive supports receiving COMMAND, TASK management transfers on both ports at the same time.
• Full duplex—The drive supports sending XFER_RDY, DATA and RESPONSE transfers while receiving frames on both ports.
Table 7 SAS task management functions supported
Task name Supported
Abort Task Yes
Clear ACA Yes
Clear task set Yes
Abort task set Yes
Logical Unit Reset Yes
Query Task Yes
Table 8 Task management response codes
Function name Response code
Function complete 00
Invalid frame 02
Function not supported 04
Function failed 05
Function succeeded 08
Invalid logical unit 09
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11.3 SCSI commands supported
Table 9 lists the SCSI commands supported by Seagate Exos 7E8 SAS drives.
Table 9 Supported commands
Command name Command code Supported
Change Definition 40h N
Compare 39h N
Copy 18h N
Copy and Verify 3Ah N
Format Unit [1] [5] 04h Y
DCRT bit supported Y
DPRY bit supported N
DSP bit supported Y
IMMED bit supported Y
IP bit supported Y
SI (Security Initialize) bit supported N
STPF bit supported Y
VS (vendor specific) N
Inquiry 12h Y
Block Device Characteristics (B1h) Y
Block Limits (B0h) Y
Date Code page (C1h) Y
Device Behavior page (C3h) Y
Device Identification (83h) Y
Extended Inquiry Data (86h) Y
Firmware Numbers page (C0h) Y
Implemented Operating Def page (81h) Y
Jumper Settings page (C2h) Y
Logical Block Provisioning (B2h) Y
Mode Page Policy (87h) Y
Power Condition (8Ah) Y
Protocol Specific Logical Unit Information (90h) Y
Protocol Specific Port Information (91h) Y
SCSI Ports (88h) Y
Supported Vital Product Data page (00h) Y
Unit Serial Number page (80h) Y
Lock-unlock cache 36h N
Log Select 4Ch Y
PCR bit Y
DU bit N
DS bit Y
TSD bit Y
ETC bit N
TMC bit N
LP bit N
Log Sense 4Dh Y
Application Client Log page (0Fh) N
Buffer Over-run/Under-run page (01h) N
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Seagate Exos 7E8 SAS Product Manual, Rev. B 50
Cache Statistics page (37h) Y
Factory Log page (3Eh) Y
Information Exceptions Log page (2Fh) Y
Last n Deferred Errors or Asynchronous Events page (0Bh) N
Last n Error Events page (07h) N
Non-medium Error page (06h) Y
Pages Supported list (00h) Y
Read Error Counter page (03h) Y
Read Reverse Error Counter page (04h) N
Self-test Results page (10h) Y
Start-stop Cycle Counter page (0Eh) Y
Temperature page (0Dh) Y
Verify Error Counter page (05h) Y
Write error counter page (02h) Y
Mode Select (same pages as Mode Sense 1Ah) 15h Y [2]
Mode Select (10) (same pages as Mode Sense 1Ah) 55h Y
Mode Sense 1Ah Y [2]
Caching Parameters page (08h) Y
Control Mode page (0Ah) Y
Disconnect/Reconnect (02h) Y
Error Recovery page (01h) Y
Format page (03h) Y
Information Exceptions Control page (1Ch/01h) Y
Background Scan mode subpage (01h) Y
Notch and Partition Page (0Ch) N
Protocol-Specific Port page (19h) Y
Power Condition page (1Ah) Y
Rigid disk Drive Geometry page (04h) Y
Unit Attention page (00h) Y
Verify Error Recovery page (07h) Y
Xor Control page (10h) N
Mode Sense (10) (same pages as Mode Sense 1Ah) 5Ah Y
Persistent Reserve In 5Eh Y
Persistent Reserve Out 5Fh Y
Prefetch (10) 34h N
Prefetch (16) 90h N.A.
Read (6) 08h Y
Read (10) 28h Y
DPO bit supported Y
FUA bit supported Y
Read (12) A8h N
Read (16) 88h Y
Read (32) 7Fh/0009h N
Read Buffer (modes 0, 2, 3, Ah and Bh supported) 3Ch Y (non-SED drives only)
Read Capacity (10) 25h Y
Table 9 Supported commands
Command name Command code Supported
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Read Capacity (16) 9Eh/10h Y
Read Defect Data (10) 37h Y
Read Defect Data (12) B7h Y
Read Long 3Eh Y (non-SED drives only)
Read Long (16) 9Eh/11h Y
Reassign Blocks 07h Y
Receive Diagnostic Results 1Ch Y
Supported Diagnostics pages (00h) Y
Translate page (40h) Y
Release 17h Y
Release (10) 57h Y
Report LUNs A0h Y
Request Sense 03h Y
Actual Retry Count bytes Y
Extended Sense Y
Field Pointer bytes Y
Reserve 16h Y
3rd Party Reserve Y
Extent Reservation N
Reserve (10) 56h Y
3rd Party Reserve Y
Extent Reservation N
Rezero Unit 01h Y
Sanitize (CRYPTOGRAPHIC ERASE) 48h Y (SED drives only)
Sanitize (OVERWRITE) 48h Y
Search Data Equal 31h N
Search Data High 30h N
Search Data Low 32h N
Security Protocol In A2h Y (SED models only)
Security Protocol Out B5h Y (SED models only)
Seek (6) 0Bh Y
Seek (10) 2Bh Y
Send Diagnostics 1Dh Y
Supported Diagnostics pages (00h) Y
Translate page (40h) Y
Set Limits 33h N
Start Unit/Stop Unit (spindle ceases rotating) 1Bh Y
Synchronize Cache 35h Y
Synchronize Cache (16) 91h Y
Test Unit Ready 00h Y
Verify (10) 2Fh Y
BYTCHK bit Y
Verify (12) AFh N
Verify (16) AFh Y
Table 9 Supported commands
Command name Command code Supported
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Seagate Exos 7E8 SAS Product Manual, Rev. B 52
[1] Seagate Exos 7E8 SAS drives can format to 512, 520 or 528 bytes per logical block.
[2] Warning. Power loss during flash programming can result in firmware corruption. This usually makes the drive inoperable.
[3] Reference Mode Sense command 1Ah for mode pages supported.
[4] Y = Yes. Command is supported.
N = No. Command is not supported.
A = Support is available on special request.
[5] Approximately 1.5 increase in time to complete this command for a SED drive versus a non-SED drive of the same capacity.
Verify (32) 7Fh/000Ah N (Supported if formatted for
type 2 protection information)
Write (6) 0Ah Y
Write (10) 2Ah Y
DPO bit Y
FUA bit Y
Write (12) AAh N
Write (16) 8Ah Y
Write (32) 7Fh/000Bh N (Supported if formatted for
type 2 protection information)
Write and Verify (10) 2Eh Y
DPO bit Y
Write and Verify (12) AEh N
Write and Verify (16) 8Eh Y
Write and Verify (32) 7Fh/000Ch N (Supported if formatted for
type 2 protection information)
Write Buffer (modes 0, 2, supported) 3Bh Y (non-SED drives only)
Write Buffer 3Bh
Firmware Download option (modes 5, 7, Ah and Bh) [3] Y (non-SED drives only)
Firmware Download option (modes 4, 5, 7) Y (SED drives only)
Write Long (10) 3Fh Y
Write Long (16) 9Fh/11h Y
Write Same (10) [5] 41h Y
PBdata N
LBdata N
Write Same (16) [5] 93h Y
Write Same (32) 7Fh/000Dh N
XDRead 52h N
XDWrite 50h N
XPWrite 51h N
Table 9 Supported commands
Command name Command code Supported
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Seagate Exos 7E8 SAS Product Manual, Rev. B 53
11.3.1 Inquiry data
Table 10 lists the Inquiry command data that the drive should return to the initiator per the format given in the SAS Interface Manual.
Table 10 Exos 7E8 inquiry data
* Copyright year (changes with actual year).
** SCSI Revision support. See the appropriate SPC release documentation for definitions.
PP 10 = Inquiry data for an Inquiry command received on Port A.
30 = Inquiry data for an Inquiry command received on Port B.
R# Four ASCII digits representing the last four digits of the product firmware release number.
S# Eight ASCII digits representing the eight digits of the product serial number.
[ ] Bytes 16 through 26 reflect model of drive. The table above shows the hex values for Model ST6000NM0095.
Refer to the values below for the values of bytes 16 through 26 of a particular model:
ST6000NM0105 53 54 36 30 30 30 4E 4D 30 31 30 35
ST6000NM0195 53 54 36 30 30 30 4E 4D 30 31 39 35
ST6000NM0205 53 54 36 30 30 30 4E 4D 30 32 30 35
ST6000NM0255 53 54 36 30 30 30 4E 4D 30 32 35 35
ST6000NM0285 53 54 36 30 30 30 4E 4D 30 32 38 35
ST4000NM0075 53 54 34 30 30 30 4E 4D 30 30 37 35
ST4000NM0095 53 54 34 30 30 30 4E 4D 30 30 39 35
ST4000NM0125 53 54 34 30 30 30 4E 4D 30 31 32 35
ST4000NM0235 53 54 34 30 30 30 4E 4D 30 32 33 35
ST4000NM0255 53 54 34 30 30 30 4E 4D 30 32 35 35
ST2000NM0115 53 54 32 30 30 30 4E 4D 30 31 31 35
ST2000NM0135 53 54 32 30 30 30 4E 4D 30 31 33 35
Bytes Data (hex)
0-15 00 00 xx** 12 8B 00 30 02 53 45 41 47 41 54 45 20 Vendor ID
16-31 [53 54 36 30 30 30 4E 4D 30 30 39 35} 20 20 20 20 Product ID
32-47 R# R# R# R# S# S# S# S# S# S# S# S# 00 00 00 00
48-63 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
64-79 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80-95 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
96-111 00 43 6F 70 79 72 69 67 68 74 20 28 63 29 20 32* *Copyright
112-127 30* 31* 35* 20 53 65 61 67 61 74 65 20 41 6C 6C 20 notice
128-143 72 69 67 68 74 73 20 72 65 73 65 72 76 65 64 20
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Seagate Exos 7E8 SAS Product Manual, Rev. B 54
11.3.2 Mode Sense data
The Mode Sense command provides a way for the drive to report its operating parameters to the initiator. The drive maintains four
sets of mode parameters:
1. Default values
Default values are hard-coded in the drive firmware stored in flash E-PROM (nonvolatile memory) on the drive’s PCB. These
default values can be changed only by downloading a complete set of new firmware into the flash E-PROM. An initiator can
request and receive from the drive a list of default values and use those in a Mode Select command to set up new current and
saved values, where the values are changeable.
2. Saved values
Saved values are stored on the drive’s media using a Mode Select command. Only parameter values that are allowed to be
changed can be changed by this method. Parameters in the saved values list that are not changeable by the Mode Select com-
mand get their values from default values storage.
When power is applied to the drive, it takes saved values from the media and stores them as current values in volatile memory. It
is not possible to change the current values (or the saved values) with a Mode Select command before the drive achieves operat-
ing speed and is “ready.” An attempt to do so results in a “Check Condition” status.
On drives requiring unique saved values, the required unique saved values are stored into the saved values storage location on
the media prior to shipping the drive. Some drives may have unique firmware with unique default values also.
On standard OEM drives, the saved values are taken from the default values list and stored into the saved values storage location
on the media prior to shipping.
3. Current values
Current values are volatile values being used by the drive to control its operation. A Mode Select command can be used to
change the values identified as changeable values. Originally, current values are installed from saved or default values after a
power on reset, hard reset, or Bus Device Reset message.
4. Changeable values
Changeable values form a bit mask, stored in nonvolatile memory, that dictates which of the current values and saved values can
be changed by a Mode Select command. A one (1) indicates the value can be changed. A zero (0) indicates the value is not
changeable. For example, in Table 11, refer to Mode page 81, in the row entitled “CHG.” These are hex numbers representing the
changeable values for Mode page 81. Note in columns 5 and 6 (bytes 04 and 05), there is 00h which indicates that in bytes 04
and 05 none of the bits are changeable. Note also that bytes 06, 07, 09, 10, and 11 are not changeable, because those fields are
all zeros. In byte 02, hex value FF equates to the binary pattern 11111111. If there is a zero in any bit position in the field, it means
that bit is not changeable. Since all of the bits in byte 02 are ones, all of these bits are changeable.
The changeable values list can only be changed by downloading new firmware into the flash E-PROM.
The following tables list the values of the data bytes returned by the drive in response to the Mode Sense command pages for SCSI
implementation (see the SAS Interface Manual ).
DEF = Default value. Standard OEM drives are shipped configured this way.
CHG = Changeable bits; indicates if default value is changeable.
Note
Because there are often several different versions of drive control firmware in the total population
of drives in the field, the Mode Sense values given in the following tables may not exactly match
those of some drives.
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Seagate Exos 7E8 SAS Product Manual, Rev. B 55
Table 11 Mode Sense data changeable and default values for 6TB drives
Block Descriptor:
00 00 00 02 BA A0 F4 B0 00 00 00 00 00 00 02 00 (512E)
00 00 00 00 57 54 1E 96 00 00 00 00 00 00 10 00 (4K)
Mode Pages:
DEF: 00 0A 00 80 0F 00 00 00 00 00 00 00
CHG: 00 0A B7 C0 8F 00 00 00 00 00 FF FF
DEF: 01 0A C0 14 FF 00 00 00 05 00 FF FF
CHG: 01 0A EF FF 00 00 00 00 FF 00 FF FF
DEF: 02 0E 00 00 00 00 00 00 00 00 00 A0 00 00 00 00
CHG: 02 0E 00 00 FF FF 00 00 FF FF FF FF 00 00 00 00
DEF: 03 16 00 01 00 00 00 00 00 02 00 03 10 00 00 01 00 00 00 00 40 00 00 00
CHG: 03 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
DEF: 04 16 06 3F 50 0A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 20 00 00
CHG: 04 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
DEF: 07 0A 00 14 FF 00 00 00 00 00 FF FF
CHG: 07 0A 0F FF 00 00 00 00 00 00 FF FF
DEF: 08 12 14 00 FF FF 00 00 FF FF FF FF 90 20 00 00 00 00 00 00
CHG: 08 12 A5 00 00 00 FF FF FF FF 00 00 20 00 00 00 00 00 00 00
DEF: 0A 0A 06 00 00 80 00 00 00 00 74 B8
CHG: 0A 0A 0F F6 00 00 00 00 00 00 00 00
DEF: 18 06 06 00 00 00 00 00
CHG: 18 06 00 00 00 00 00 00
DEF: 19 0E 46 00 07 D0 00 00 00 00 00 00 00 00 00 00
CHG: 19 0E 50 00 FF FF FF FF FF FF 00 00 00 00 00 00
DEF: 1A 26 00 06 00 00 00 01 00 00 23 28 00 00 04 B0 00 00 17 70 00 00 17 70 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 58
CHG: 1A 26 01 0F FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 FC
DEF: 1C 0A 10 00 00 00 00 00 00 00 00 01
CHG: 1C 0A 9D 0F FF FF FF FF FF FF FF FF
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Seagate Exos 7E8 SAS Product Manual, Rev. B 56
Table 12 Mode Sense data changeable and default values for 4TB drives
BLOCK DESCRIPTOR:
00 00 00 02 BA A0 F4 B0 00 00 00 00 00 00 02 00 (512E)
00 00 00 00 57 54 1E 96 00 00 00 00 00 00 10 00 (4K)
Mode Pages:
DEF: 00 0A 00 80 0F 00 00 00 00 00 00 00
CHG: 00 0A B7 C0 8F 00 00 00 00 00 FF FF
DEF: 01 0A C0 14 FF 00 00 00 05 00 FF FF
CHG: 01 0A FF FF 00 00 00 00 FF 00 FF FF
DEF: 02 0E 00 00 00 00 00 00 00 00 00 A0 00 00 00 00
CHG: 02 0E 00 00 FF FF 00 00 FF FF FF FF 00 00 00 00
DEF: 03 16 00 01 00 00 00 00 00 02 00 03 10 00 00 01 00 00 00 00 40 00 00 00
CHG: 03 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
DEF: 04 16 06 1B 47 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 20 00 00
CHG: 04 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
DEF: 07 0A 00 14 FF 00 00 00 00 00 FF FF
CHG: 07 0A 0F FF 00 00 00 00 00 00 FF FF
DEF: 08 12 14 00 FF FF 00 00 FF FF FF FF 90 20 00 00 00 00 00 00
CHG: 08 12 A5 00 00 00 FF FF FF FF 00 00 20 00 00 00 00 00 00 00
DEF: 0A 0A 02 00 00 80 00 00 00 00 4A 4C
CHG: 0A 0A 0F F6 00 00 00 00 00 00 00 00
DEF: 18 06 06 00 00 00 00 00
CHG: 18 06 00 00 00 00 00 00
DEF: 19 0E 46 00 07 D0 00 00 00 00 00 00 00 00 00 00
CHG: 19 0E 50 00 FF FF FF FF FF FF 00 00 00 00 00 00
DEF: 1A 26 00 06 00 00 00 01 00 00 23 28 00 00 04 B0 00 00 17 70 00 00 17 70 00 00 00 00 00 00
CHG: 1A 26 01 0F FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00
DEF: 1C 0A 10 00 00 00 00 00 00 00 00 01
CHG: 1C 0A 9D 0F FF FF FF FF FF FF FF FF
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Seagate Exos 7E8 SAS Product Manual, Rev. B 57
Table 13 Mode Sense data changeable and default values for 2TB drives
BLOCK DESCRIPTOR:
00 00 00 00 E8 E0 88 B0 00 00 00 00 00 00 02 00 (512E)
00 00 00 00 1D 1C 11 16 00 00 00 00 00 00 10 00 (4K)
Mode Pages:
DEF: 00 0A 00 80 0F 00 00 00 00 00 00 00
CHG: 00 0A B7 C0 8F 00 00 00 00 00 FF FF
DEF: 01 0A C0 14 FF 00 00 00 05 00 FF FF
CHG: 01 0A FF FF 00 00 00 00 FF 00 FF FF
DEF: 02 0E 00 00 00 00 00 00 00 00 00 A0 00 00 00 00
CHG: 02 0E 00 00 FF FF 00 00 FF FF FF FF 00 00 00 00
DEF: 03 16 00 01 00 00 00 00 00 02 00 03 10 00 00 01 00 00 00 00 40 00 00 00
CHG: 03 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
DEF: 04 16 04 EB 46 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 20 00 00
CHG: 04 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
DEF: 07 0A 00 14 FF 00 00 00 00 00 FF FF
CHG: 07 0A 0F FF 00 00 00 00 00 00 FF FF
DEF: 08 12 14 00 FF FF 00 00 FF FF FF FF 90 20 00 00 00 00 00 00
CHG: 08 12 A5 00 00 00 FF FF FF FF 00 00 20 00 00 00 00 00 00 00
DEF: 0A 0A 02 00 00 80 00 00 00 00 2A 30
CHG: 0A 0A 0F F6 00 00 00 00 00 00 00 00
DEF: 18 06 06 00 00 00 00 00
CHG: 18 06 00 00 00 00 00 00
DEF: 19 0E 46 00 07 D0 00 00 00 00 00 00 00 00 00 00
CHG: 19 0E 50 00 FF FF FF FF FF FF 00 00 00 00 00 00
DEF: 1A 26 00 06 00 00 00 01 00 00 23 28 00 00 04 B0 00 00 17 70 00 00 17 70 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 58
CHG: 1A 26 01 0F FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
DEF: 1C 0A 10 00 00 00 00 00 00 00 00 01
CHG: 1C 0A 9D 0F FF FF FF FF FF FF FF FF
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Seagate Exos 7E8 SAS Product Manual, Rev. B 58
11.4 Miscellaneous operating features and conditions
Table 14 lists various features and conditions. A “Y” in the support column indicates the feature or condition is supported. An “N” in
the support column indicates the feature or condition is not supported.
11.4.1 SAS physical interface
Figure 14 shows the location of the SAS device connector J1. Figures 15 and 16 provide the dimensions of the SAS connector.
Details of the physical, electrical, and logical characteristics are provided within this section. The operational aspects of Seagate’s SAS
drives are provided in the SAS Interface Manual.
Figure 14. Physical interface
Table 14 Miscellaneous features
Supported Feature or condition
N Automatic contingent allegiance
N Asynchronous event notification
N Synchronized (locked) spindle operation
Y Segmented caching
N Zero latency read
Y Queue tagging (up to 64 queue tags supported)
Y Deferred error handling
Y Parameter rounding (controlled by Round bit in Mode Select page 0)
Y Reporting actual retry count in Extended Sense bytes 15, 16, and 17
N Adaptive caching
Y SMP = 1 in Mode Select command needed to save RPL and rotational offset bytes
Table 15 Miscellaneous status
Supported Status
YGood
Y Check condition
Y Condition met/good
YBusy
YIntermediate/good
Y Intermediate/condition met/good
Y Reservation conflict
YTask set full
NACA active
N ACA active, faulted initiator
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Seagate Exos 7E8 SAS Product Manual, Rev. B 59
Figure 15. SAS device plug dimensions
C OF DATUM B
L
5.08
1.27 (6X)
1.27 (14X)
15.875
0.35MIN
15.875
33.43 0.05 B
4.90 0.08
0.84 0.05 (22X)
0.15 B
P15 P1
S7
S1
SEE Detail1
0.30 0.05 (4X)
4.00 0.08
0.15 D
0.30 0.05 (2X)
41.13 0.15
B
BC
CA
A
0.20 B
42.73 REF.
C OF DATUM D
L
1.10
R0.30 0.08 (4X)
2.00 (3X)
5.08
0.45 0.03 (7X)
0.10 M E
4.65
0.80 (6X)
7.625.92
0.52 0.08 x 45
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Seagate Exos 7E8 SAS Product Manual, Rev. B 60
Figure 16. SAS device plug dimensions (detail)
11.4.2 Physical characteristics
This section defines physical interface connector.
6.10
Detail A
0.30 0.05 x 45 (5X)
0.40 0.05 X 45 (3X)
CORING ALLOWED
IN THIS AREA.
2.25 0.05
4.85 0.05
0.10 B
E
S14 S8
4.40 0.15
SEE Detail 2
3.90 0.15
SECTION A - A
SECTION C - C
A
0.35 0.05
45
R0.30 0.08 C
1.95 0.08
0.08 0.05
1.23 0.05
0.08 0.05
Detail 2
CONTACT SURFACE FLUSH
TO DATUM A 0.03
65
30
1.90 0.08
SECTION B - B
2.40 0.08
0.10 A
D
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Seagate Exos 7E8 SAS Product Manual, Rev. B 61
11.4.3 Connector requirements
Contact the preferred connector manufacturer for mating part information. Part numbers for SAS connectors will be provided in a
future revision of this publication when production parts are available from major connector manufacturers.
The SAS device connector is illustrated in Figures 15 and 16.
11.4.4 Electrical description
SAS drives use the device connector for:
• DC power
• SAS interface
• Activity LED
This connector is designed to either plug directly into a backpanel or accept cables.
11.4.5 Pin descriptions
This section provides a pin-out of the SAS device and a description of the functions provided by the pins.
Table 16 SAS pin descriptions
* - Short pin to support hot plugging
** - Power Disable (T10 Industry Standard) for remote management of the end device. Allows power cycling / power saving to be
controlled by the host via interface pin 3.
NC - No connection in the drive.
Pin Signal name Signal type Pin Signal name Signal type
S1 Port A Ground P1* NC (reserved 3.3Volts)
S2* +Port A_in Diff. input pair P2* NC (reserved 3.3Volts)
S3* -Port A_in P3 SAS Power Disable **
S4 Port A Ground P4 Ground
S5* -Port A_out Diff output pair P5 Ground
S6* +Port A_out P6 Ground
S7 Port A Ground P7 5 Volts charge
S8 Port B Ground P8* 5 Volts
S9* +Port B_in Diff. input pair P9* 5 Volts
S10* -Port B_in P10 Ground
S11 Port A Ground P11* Ready LED Open collector out
S12* -Port B_out Diff output pair P12 Ground
S13* +Port B_out P13 12 Volts charge
S14 Port B Ground P14* 12 Volts
P15* 12 Volts
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Seagate Exos 7E8 SAS Product Manual, Rev. B 62
11.4.6 SAS transmitters and receivers
A typical SAS differential copper transmitter and receiver pair is shown in Figure 17. The receiver is AC coupling to eliminate ground
shift noise.
Figure 17. SAS transmitters and receivers
11.4.7 Power
The drive receives power (+5 volts and +12 volts) through the SAS device connector.
Three +12 volt pins provide power to the drive, 2 short and 1 long. The current return for the +12 volt power supply is through the
common ground pins. The supply current and return current must be distributed as evenly as possible among the pins.
Three +5 volt pins provide power to the drive, 2 short and 1 long. The current return for the +5 volt power supply is through the
common ground pins. The supply current and return current must be distributed as evenly as possible among the pins.
Current to the drive through the long power pins may be limited by the system to reduce inrush current to the drive during hot
plugging.
11.5 Signal characteristics
This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 16 for signal type and
signal name information.
11.5.1 Ready LED Out
The Ready LED Out signal is driven by the drive as indicated in Table 17.
The Ready LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the proper +3.3 volt supply
through an appropriate current limiting resistor. The LED and the current limiting resistor are external to the drive. See Table 18 for
the output characteristics of the LED drive signals.
Table 17 Ready LED Out conditions
Normal command activity LED status
Ready LED Meaning bit mode page 19h 01
Spun down and no activity Off Off
Spun down and activity (command executing) On On
Spun up and no activity On Off
Spun up and activity (command executing) Off On
Spinning up or down Blinks steadily
(50% on and 50% off, 0.5 seconds on and off for 0.5 seconds)
Format in progress, each cylinder change Toggles on/off
Receiver
Differential
Transfer Medium
.01
.01
100100
Transmitter
RX
RY
TX
TY
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Seagate Exos 7E8 SAS Product Manual, Rev. B 63
11.5.2 Differential signals
The drive SAS differential signals comply with the intra-enclosure (internal connector) requirements of the SAS standard.
Table 19 defines the general interface characteristics.
11.6 SAS-3 Specification Compliance
Seagate SAS-3 compatible drives are compliant with the latest SAS-3 Specification (T10/BSR INCITS 519 rev. 06).
The main difference from SAS-2 is the Tx and Rx training that allows the host and drive to adjust the amplitude and emphasis values
to the channel. The receiver still employs Decision Feedback Equalizer (DFE) and Feed Forward Equalizer (FFE) circuitry to accomplish
this training.
1. A Decision Feedback Equalizer (DFE) which utilizes the standard SAS-2 training pattern transmitted during the SNW-3 training gap. The DFE cir-
cuit can derive an optimal equalization characteristic to compensate for many of the receive losses in the system.
2. A Feed Forward Equalizer (FFE) optimized to provide balanced receive margins over a range of channels bounded by the best and worst case
channels as defined by the relevant ANSI standard.
11.7 Additional information
Please contact the Seagate representative for SAS electrical details, if required.
For more information about the Phy, Link, Transport, and Applications layers of the SAS interface, refer to the Seagate SAS Interface
Manual, part number 100293071.
For more information about the SCSI commands used by Seagate SAS drives, refer to the Seagate SCSI Commands Reference Manual,
part number 100293068.
Table 18 LED drive signal
State Test condition Output voltage
LED off, high 0 V ≤ VOH £ 3.6 V -100 μA < IOH < 100 μA
LED on, low IOL = 15 mA 0 £ VOL ≤ 0.225 V
Table 19 General interface characteristics
Characteristic Units 1.5Gb/s 3.0Gb/s 6.0Gb/s 12 Gbps
Bit rate (nominal) Mbaud 1,500 3,000 6,000 12000
Unit interval (UI) (nominal) ps 666.6 333.3 166.6 83.3
Impedance (nominal, differential) ohm 100 100 100 100
Transmitter transients, maximum V ± 1.2 ± 1.2 ± 1.2 ± 1.2
Receiver transients, maximum V ± 1.2 ± 1.2 ± 1.2 ± 1.2
Print Date:2017-Oct-31 14:50:59 CDT Released; Prod Rel; B; 100827322 Seagate Confidential
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Publication Number: 100827322, Rev. B
October 2017
Print Date:2017-Oct-31 14:50:59 CDT Released; Prod Rel; B; 100827322 Seagate Confidential