Table of Contents
- 7E8 SAS Product Manual
- Seagate® Technology Support Services
- 1.0 Scope
- 2.0 Applicable standards and reference documentation
- 3.0 General description
- 4.0 Performance characteristics
- 5.0 Reliability specifications
- 6.0 Physical/electrical specifications
- 7.0 About self-encrypting drives
- 8.0 About FIPS
- 9.0 Defect and error management
- 10.0 Installation
- 11.0 Interface requirements
Seagate ST8000NM0075 User Manual
Displayed below is the user manual for ST8000NM0075 by Seagate which is a product in the Internal Hard Drives category. This manual has pages.
Related Manuals
Standard 4KN models
ST8000NM0065
ST6000NM0075
Self-Encryption 4KN models
ST8000NM0095
ST6000NM0145
SED FIPS 4KN models
ST8000NM0125
Standard 512E models
ST8000NM0075
ST6000NM0085
Self-Encryption 512E models
ST8000NM0085
ST6000NM0135
SED FIPS 512E models
ST8000NM0135
100827318, Rev. A
October 2017
7E8 SAS Product Manual
© 2017 Seagate Technology LLC. All rights reserved.
Publication number: 100827318, Rev. A 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 10/13/2017 Initial release.
Seagate Exos 7E8 SAS Product Manual, Rev.A 2
Contents
Seagate® Technology Support Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.0 Applicable standards and reference documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Agency and Safety Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Safety certification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Regulatory Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5 Electromagnetic compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5.1 European Union (EU) CE Marking Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5.2 Australian RCM Compliance Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5.3 Canada ICES-003 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5.4 South Korean KC Certification Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5.5 Morocco Commodity Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5.6 Taiwanese BSMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5.7 FCC verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.6 Environmental protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.6.1 European Union Restriction of Hazardous Substance Law. . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.6.2 China Requirements —China RoHS 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.6.3 Taiwan Requirements — Taiwan RoHS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.7 Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.0 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1 Standard features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Media description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.4 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.5 Formatted capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.6 Programmable drive capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.7 Factory-installed options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.0 Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Internal drive characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1.1 Format command execution time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1.2 General performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.3 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4 Cache operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4.2 Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Seagate Exos 7E8 SAS Product Manual, Rev.A 3
Contents
5.0 Reliability specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1.1 Recoverable Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1.2 Unrecoverable Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1.3 Seek errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1.4 Interface errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2 Reliability and service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2.1 Annualized Failure Rate (AFR) and Mean Time Between Failure (MTBF) . . . . . . . . . . . . . . 19
5.2.2 Hot plugging the drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2.3 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2.4 Thermal monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2.5 Drive Self Test (DST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2.6 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.1 PowerChoiceTM power management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.1.1 PowerChoice reporting methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.2 AC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.3 DC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.3.1 Conducted noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.3.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.3.3 Current profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.4 Power dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.5 Environmental limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.5.1 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.5.2 Humidity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.5.3 Effective altitude (sea level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.5.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6.5.5 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.5.6 Air cleanliness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.5.7 Corrosive environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.5.8 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.6 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Seagate Exos 7E8 SAS Product Manual, Rev.A 4
Contents
7.0 About self-encrypting drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.1 Data encryption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.2 Controlled access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.2.1 Admin SP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.2.2 Locking SP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.2.3 Default password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.3 Random number generator (RNG). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.4 Drive locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.5 Data bands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.6 Cryptographic erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.7 Authenticated firmware download . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.8 Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.9 Supported commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.10 Sanitize - CRYPTOGRAPHIC ERASE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.11 RevertSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.0 About FIPS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9.0 Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.1 Drive internal defects/errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.2 Drive error recovery procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.3 SAS system errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
9.4 Background Media Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9.5 Media Pre-Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9.6 Deferred Auto-Reallocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9.7 Idle Read After Write. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9.8 Protection Information (PI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
9.8.1 Levels of PI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
9.8.2 Setting and determining the current Type Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
9.8.3 Identifying a Protection Information drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Seagate Exos 7E8 SAS Product Manual, Rev.A 5
Contents
10.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
10.1 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
10.2 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
10.3 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
10.4 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
11.0 Interface requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
11.1 SAS features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
11.1.1 task management functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
11.1.2 task management responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
11.2 Dual port support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
11.3 SCSI commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
11.3.1 Inquiry data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
11.3.2 Mode Sense data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
11.4 Miscellaneous operating features and conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
11.4.1 SAS physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
11.4.2 Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
11.4.3 Connector requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
11.4.4 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
11.4.5 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
11.4.6 SAS transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
11.4.7 Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
11.5 Signal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
11.5.1 Ready LED Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
11.5.2 Differential signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
11.6 SAS-3 Specification Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
11.7 Additional information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Seagate Exos 7E8 SAS Product Manual, Rev.A 6
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
Seagate Exos 7E8 SAS Product Manual, Rev.A 7
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.
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.
.
Standard 4KN
models
Self-Encrypting 4KN
(SED) models
SED FIPS (140-2)
4KN models
ST8000NM0065 ST8000NM0095 ST8000NM0125
ST6000NM0075 ST6000NM0145
Standard 512E
models
Self-Encrypting 512E
(SED) models
SED FIPS (140-2)
512E models
ST8000NM0075 ST8000NM0085 ST8000NM0135
ST6000NM0085 ST6000NM0135
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).
Seagate Exos 7E8 SAS Product Manual, Rev.A 8
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.Agency and Safety Certifications
2.1 Agency and Safety Certifications
Each Hard Drive and Solid State Drive ("drives") has a product label that includes certifications that are applicable to that specific
drive. The following information provides an overview of requirements that may be applicable to the drive.
2.2 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.
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.
2.3 Regulatory Models
The following regulatory model number represent all features and configurations within the series:
Regulatory Model Numbers: STT001
2.4 Electromagnetic susceptibility
The drive as delivered is tested to meet susceptibility requirements in a representative enclosure. 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 Section 6.3, DC power requirements.
2.5 Electromagnetic compliance
Seagate uses an independent laboratory to confirm compliance with the directives/standards for CE Marking and RCM Marking. The drive was
tested in a representative system for typical applications and comply with the Electromagnetic Interference/Electromagnetic Susceptibility (EMI/
EMS) for Class B products. The selected system represents the most popular characteristics for test platforms. The system configurations include:
• Typical current use microprocessor
•Keyboard
• Monitor/display
•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.
2.5.1 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 2.6.1.1 on page 10.
2.5.2 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).
Seagate Exos 7E8 SAS Product Manual, Rev.A 9
2.5.3 Canada ICES-003
If this model has the ICES-003:2016 marking it complies with requirements of ICES tested per ANSI C63.4-2014.
2.5.4 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.
2.5.5 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.
2.5.6 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 2.6.1 on page 11.
2.5.7 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.
ࣗطیࡈ߇ΰח
%
ɼࢽࡈ؏ܞݦࢢ
ࢇЕɼࢽࡈ% ࢷળࢶଢԻ۰࣯Ի
ɼࢽ߾۰یࡈଜЕʨࡶּࢶࡳԻଜֲ ֻҘ
ࠇ߾۰یࡈଟܹݡТЬ
Seagate Exos 7E8 SAS Product Manual, Rev.A 10
2.6 Environmental protection
Seagate designs its products to meet environmental protection requirements worldwide, including regulations restricting certain
chemical substances.
2.6.1 European Union Restriction of Hazardous Substance Law
2.6.1.1 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).
2.6.1.2 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.
2.6.2 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.
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.
20
Seagate Exos 7E8 SAS Product Manual, Rev.A 11
2.6.1 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.
2.7 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-8223 2.5” Drive Form Factor with Serial Connector
SFF-8460 HSS Backplane Design Guidelines
SFF-8470 Multi Lane Copper Connector
SFF-8482 SAS Plug Connector
INCITS 481-2011 Fibre Channel Protocol for SCSI -4 (FCP-4)
INCITS 502 SCSI Primary Commands-5 (SPC-5) Rev. 10
INCITS 506 SCSI Block Commands-4 (SBC-4) Rev. 10
INCITS 519 Serial Attached SCSI (SAS-3) Rev. 06
INCITS 538 SCSI Protocol Layer-4 (SPL-4) Rev. 08
INCITS 536 Zone Block Commands (ZBC)
ANSI Small Computer System Interface (SCSI) Documents
INCITS 515 SCSI Architecture Model (SAM-5) Rev. 11
Trusted Computing Group (TCG) Documents (apply to Self-Encrypting Drive models only)
TCG Storage Architecture Core Specification, Rev. 1.0
TCG Storage Security Subsystem Class Enterprise Specification, Rev. 1.0
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.
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)
印刷电路板组装
PCBA —〇〇〇〇〇
机壳
Chassis or Cabinet —〇〇〇〇〇
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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 12
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.
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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 13
3.1 Standard features
Seagate Exos 7E8 SAS drives have the following standard features:
• 128 - deep task set (queue)
• 256MB data buffer (see Section 4.4).
• 3.0 / 6.0/12.0 Gb Serial Attached SCSI (SAS) interface
• 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
• User-selectable logical block sizes for 4KN (4096, 4160, 4192 or 4224 bytes per logical block).
• User-selectable logical block sizes for 512E (512, 520, 524 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)
.
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
Note There is no significant performance difference between Self-Encrypting Drive and standard (non-Self-Encrypting Drive) models.
Seagate Exos 7E8 SAS Product Manual, Rev.A 14
3.5 Formatted capacities
Standard OEM models are formatted to 512 bytes per block for 512 emulation and native drives and 4096 bytes per block for 4096 native drives. The
block size is selectable at format time. Supported block sizes are 512, 520, 524, and 528 for 512 emulation and native drives and 4096, 4160, 4192,
and 4224 for 4096 native drives. 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:
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
generation to generation. The current guaranteed operating points for this product are shown below.
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
8TB models 6TB models
Decimal Hex Decimal Hex
512 15,628,053,168 3A3812AB0 11,721,045,168 2BAA0F4B0
520 15,397,435,952 38FCC5930 11,473,076,960 2ABD942E0
524 15,093,541,336 383A529D8 11,320,156,000 2A2BBDF60
528 14,876,660,752 376B7D410 11,157,495,560 29909DF08
4096 1,953,506,646 74702556 1,465,130,646 57541E96
4160 1,915,384,616 722A7328 1,436,538,464 559FD660
4192 1,891,221,376 70B9BF80 1,418,416,032 548B4FA0
4224 1,876,893,944 6FDF20F8 1,407,670,456 53E758B8
Seagate Exos 7E8 SAS Product Manual, Rev.A 15
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 8TB models 6TB models (formatted, rounded off value)
Read/write data heads 12 12
Bytes/track 2,179,072 Bytes (average, rounded off values)
Bytes/surface 1,300,000 MB (unformatted, rounded off values)
Tracks/surface (total) 33,900 Tracks (user accessible)
Tracks/in 375,000 TPI (average)
Peak bits/in 2,226,000 BPI
Areal density 802 Gb/in2
Internal data rate 2546 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 and 4KN-byte sectors
(minutes) 8TB models 6TB models
Maximum (with verify) 1438 1077
Maximum (without verify) 718 539
Minimum sector interleave 1 to 1
Maximum Internal data rate* 2.32 Gb/s
Sustained transfer rate 109 to 237 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
Seagate Exos 7E8 SAS Product Manual, Rev.A 16
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 9.
4.4 Cache operation
.
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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 17
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 9 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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 18
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
Seagate Exos 7E8 SAS Product Manual, Rev.A 19
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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 20
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
Seagate Exos 7E8 SAS Product Manual, Rev.A 21
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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 22
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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 23
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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 24
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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 25
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.
[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)
Table 3 8TB and 6TB drive DC power requirements
Notes
12.0Gb mode
(Amps) (Amps) (Watts)
Voltage +5V +12V [2]
Regulation [5] ± 5% [2]
Avg idle current DCX [1] [6] 0.40 0.55 8.57
Advanced idle current
Idle A 0.39 0.55 8.47
Idle B 0.32 0.48 7.28
Idle C 0.33 0.38 6.21
Standby 0.31 0.01 1.60
Maximum starting current
(peak DC) DC [3] 0.78 2.05 28.45
(peak AC) AC [3] 1.18 2.94
Delayed motor start (max) DC [1] [4] 0.34 0.02
Operating current (random read 4K16Q)
Typical DCX [1] 0.43 0.84 12.28
Maximum DC [1] 0.44 0.85
Maximum (peak) DC 1.02 2.49
Operating current (random write 4K16Q)
Typical DCX [1] 0.47 0.61 9.61
Maximum DC [1] 0.47 0.61
Maximum (peak) DC 0.78 2.44
Operating current (sequential read 64K16Q)
Typical DCX [1] 0.77 0.59 10.95
Maximum DC [1] 0.79 0.60
Maximum (peak) DC 1.05 1.06
Operating current (sequential write 64K16Q)
Typical DCX [1] 0.65 0.62 10.66
Maximum DC [1] 0.66 0.62
Maximum (peak) DC 0.80 1.82
Seagate Exos 7E8 SAS Product Manual, Rev.A 26
[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] During idle, the drive heads are relocated every 60 seconds to a random location within the band from three-quarters to maximum track.
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.
+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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 27
6.3.3 Current profiles
The +12V (top) and +5V (bottom) current profiles for the Exos 7E8 drives are shown below.
Figure 1. 8TB model current profiles.
Note All times and currents are typical. See Table 3 for maximum current requirements.
Seagate Exos 7E8 SAS Product Manual, Rev.A 28
6.4 Power dissipation
8TB and 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 2.). 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 2. 8TB and 6TB models (12Gb) DC current and power vs. input/output operations per second
Seagate Exos 7E8 SAS Product Manual, Rev.A 29
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 3 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 3. 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
Seagate Exos 7E8 SAS Product Manual, Rev.A 30
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 4,
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 300 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).
Seagate Exos 7E8 SAS Product Manual, Rev.A 31
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 4. 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
Seagate Exos 7E8 SAS Product Manual, Rev.A 32
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.
6.5.8 Electromagnetic susceptibility
See Section 2.4 on page 8.
Seagate Exos 7E8 SAS Product Manual, Rev.A 33
6.6 Mechanical specifications
Refer to Figure 5 for detailed mounting configuration dimensions. See Section 10.3, “Drive mounting.”
Figure 5. Mounting configuration dimensions (8TB & 6TB models)
Weight: 8TB 1.720 lb 780 g
6TB
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.
3.750±.010
2X 1.625±.020
2X 3.000±.010
.127±.010
4.000±.010
1.432±.019
2
.814±.020
2
4X 6-32 UNC 2B
3 MIN THREAD DEPTH
.1 MAX FASTENER PENETRATION
MOUNTING HOLE.
MAX TORQUE 6 IN/LBS
Y
B
5.787 MAX
146.99 MM
.250±.010
2X 4.000±.010
2X 1.122±.020
2X 6-32 UNC 2B
3 MIN THREAD DEPTH
.1 MAX FASTENER PENETRATION
MOUNTING HOLES BOTH SIDES.
MAX TORQUE 6 IN/LBS
Z
Y
1.028 MAX
26.11 MM
.142±.015
2
2.000
C
LOF DRIVE
C
LOF DRIVE C
L
OF CONN
Z
TEMPERATURE
CHECKPOINT 60°C MAX
Seagate Exos 7E8 SAS Product Manual, Rev.A 34
7.0 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 2.7.
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.
7.1 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 7.5).
7.2 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.
7.2.1 Admin SP
The Admin SP allows the drive's owner to enable or disable firmware download operations (see Section 7.4). Access to the Admin SP is available
using the SID (Secure ID) password or the MSID (Manufacturers Secure ID) password.
7.2.2 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).
7.2.3 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.
7.3 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.
7.4 Drive locking
In addition to changing the passwords, as described in Section 7.2.3, 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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 35
7.5 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 7.6) or the password when required. The bands should be aligned to 4K LBA boundaries.
7.6 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.
7.7 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.
7.8 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.
7.9 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 7:
• Security Protocol Out (B5h)
• Security Protocol In (A2h)
7.10 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)
7.11 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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 36
8.0 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.
Seagate Enterprise SEDs
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".
Level 2 security
Security Level 2 enhances the physical security mechanisms of a Security Level 1 cryptographic module by adding the requirement
for tamper-evidence, which includes the use of tamper-evident coatings or seals on removable covers of the module. Tamper-
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 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 perform a corresponding set of
services.
Figure 6. Example of FIPS tamper evidence labels.
Note Image is for reference only, may not represent actual drive
Seagate Exos 7E8 SAS Product Manual, Rev.A 37
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 4 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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 38
* 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 4 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
Seagate Exos 7E8 SAS Product Manual, Rev.A 39
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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 40
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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 41
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 7. 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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 42
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 8. 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 8. 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)
Seagate Exos 7E8 SAS Product Manual, Rev.A 43
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.
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
Seagate Exos 7E8 SAS Product Manual, Rev.A 44
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 5 lists the SAS task management functions supported.
11.1.2 task management responses
Table 6 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 5 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 6 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
Seagate Exos 7E8 SAS Product Manual, Rev.A 45
11.3 SCSI commands supported
Table 7 lists the SCSI commands supported by Seagate Exos 7E8 SAS drives.
Table 7 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
Seagate Exos 7E8 SAS Product Manual, Rev.A 46
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 7 Supported commands
Command name Command code Supported
Seagate Exos 7E8 SAS Product Manual, Rev.A 47
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 7 Supported commands
Command name Command code Supported
Seagate Exos 7E8 SAS Product Manual, Rev.A 48
[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 7 Supported commands
Command name Command code Supported
Seagate Exos 7E8 SAS Product Manual, Rev.A 49
11.3.1 Inquiry data
Table 8 lists the Inquiry command data that the drive should return to the initiator per the format given in the SAS Interface Manual.
Table 8 Seagate Exos 7E8 SAS 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 ST8000NM0065.
Refer to the values below for the values of bytes 16 through 26 of a particular model:
ST8000NM0075 53 54 38 30 30 30 4E 4D 30 30 37 35
ST8000NM0085 53 54 38 30 30 30 4E 4D 30 30 38 35
ST8000NM0095 53 54 38 30 30 30 4E 4D 30 30 39 35
ST8000NM0125 53 54 38 30 30 30 4E 4D 30 31 32 35
ST8000NM0175 53 54 38 30 30 30 4E 4D 30 31 37 35
ST6000NM0075 53 54 36 30 30 30 4E 4D 30 30 37 35
ST6000NM0085 53 54 36 30 30 30 4E 4D 30 30 38 35
ST6000NM0135 53 54 36 30 30 30 4E 4D 30 31 33 35
ST6000NM0145 53 54 36 30 30 30 4E 4D 30 31 34 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 38 30 30 30 4E 4D 30 30 36 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* 36* 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
Seagate Exos 7E8 SAS Product Manual, Rev.A 50
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 9, 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.
Seagate Exos 7E8 SAS Product Manual, Rev.A 51
Table 9 Mode Sense data changeable and default values for 8TB drives
Block Descriptor:
00 00 00 03 A3 81 2A B0 00 00 00 00 00 00 02 00 (512E)
00 00 00 00 74 70 25 56 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 6F 0C 0C 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 7F FF
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 04 B0 00 00 23 28 00 00 09 60 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
Seagate Exos 7E8 SAS Product Manual, Rev.A 52
Table 10 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 45 EC 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 8D 18
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 04 B0 00 00 23 28 00 00 09 60 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
Seagate Exos 7E8 SAS Product Manual, Rev.A 53
11.4 Miscellaneous operating features and conditions
Table 11 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 9 shows the location of the SAS device connector J1. Figures 10 and 11 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 9. Physical interface
Table 11 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 12 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
Seagate Exos 7E8 SAS Product Manual, Rev.A 54
Figure 10. 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
Seagate Exos 7E8 SAS Product Manual, Rev.A 55
Figure 11. SAS device plug dimensions (detail)
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
Seagate Exos 7E8 SAS Product Manual, Rev.A 56
11.4.2 Physical characteristics
This section defines physical interface connector.
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 10 and 11.
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 13 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
Seagate Exos 7E8 SAS Product Manual, Rev.A 57
11.4.6 SAS transmitters and receivers
A typical SAS differential copper transmitter and receiver pair is shown in Figure 12. The receiver is AC coupling to eliminate ground shift noise.
Figure 12. 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 13 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 14.
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 15 for the output characteristics of
the LED drive signals.
Table 14 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
Table 15 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
Receiver
Differential
Transfer Medium
.01
.01
100100
Transmitter
RX
RY
TX
TY
Seagate Exos 7E8 SAS Product Manual, Rev.A 58
11.5.2 Differential signals
The drive SAS differential signals comply with the intra-enclosure (internal connector) requirements of the SAS standard.
Table 16 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 16 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
Seagate Technology LLC
AMERICAS Seagate Technology LLC 10200 South De Anza Boulevard, Cupertino, California 95014, United States, 408-658-1000
ASIA/PACIFIC Seagate Singapore International Headquarters Pte. Ltd. 7000 Ang Mo Kio Avenue 5, Singapore 569877, 65-6485-3888
EUROPE, MIDDLE EAST AND AFRICA Seagate Technology SAS 16-18 rue du Dôme, 92100 Boulogne-Billancourt, France, 33 1-4186 10 00
Publication Number: 100827318, Rev. A
October 2017