Seagate ST336754SS - Cheetah 36.7 GB Hard Drive, Cheetah 15K.4 SAS, ST373454SS Product Manual

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Cheetah 15K.4 SAS

ST3146854SS ST373454SS ST336754SS

Cheetah 15K.4 SAS

ST3146854SS ST373454SS ST336754SS

Publication number: 100350601, Rev. B

May 2005

Seagate and Seagate Technology are registered tradem arks of Seagate Technology LLC. Cheetah, SeaTools, SeaF ONE, SeaBOARD, Sea TDD, and the Wave logo are eith er regis tered trademarks or trademarks of Seagate T echnology LLC. Other product names are registered trademarks or trademarks of their owners.

Seagate reserves the right to ch ange, witho ut notice, product offerings or spec ifications . No

part of this publication may be reproduc ed in any form w ithout wr itte n per mi ssio n of Seagate

Technology LLC.

Revision status summary sheet

Revision Date Sheets Affected

Rev. A 11/22/04 All. Rev. B 05/04/05 Pages 11, 37, 58, and 59.

Contents

1.0 Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.0 Standards, compliance and reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.1 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.1.1 Electromagnetic compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.2 Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2.1 Electromagnetic compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.3 Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.0 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 Standard features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.2 Media description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.3 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.4 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.5 Formatted capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.6 Programmable drive capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.7 Factory-installed accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.8 Factory-installed options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.9 User-installed accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.0 Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.1 Internal drive characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.2 Seek performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.2.1 Access time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.2.2 Format command execution time (minutes) . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.2.3 General performance characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.3 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.4 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.5 Cache operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.5.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.5.2 Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.5.3 Optimizing cache performance for desktop and server applications . . . . . . . . . 15

5.0 Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.1.1 Recoverable Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.1.2 Unrecoverable Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.1.3 Seek errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.1.4 Interface errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.2 Reliability and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.2.1 Annualized Failure Rate (AFR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.2.2 Preventive maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.2.3 Hot plugging the drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.2.4 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.2.5 Thermal monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.2.6 Drive Self Test (DST). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.2.7 Product warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.1 AC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.2 DC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.2.1 Conducted noise immunity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.2.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.2.3 Current profiles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.3 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Cheetah 15K.4 SAS Product Manual, Rev. B i

6.4 Environmental limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

6.4.1 Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

6.4.3 Effective altitude (sea level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

6.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

6.4.5 Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

6.4.6 Corrosive environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

6.4.7 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

6.4.8 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

6.5 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.0 Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

7.1 Drive internal defects/errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

7.2 Drive error recovery procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

7.3 SAS system errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

8.0 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

8.1 Drive orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

8.2 Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

8.3 Drive mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

8.4 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

9.0 Interface requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

9.1 SAS features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

9.1.1 task management functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

9.1.2 task management responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

9.2 Dual port support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

9.3 SCSI commands supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

9.3.1 Inquiry data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

9.3.2 Mode Sense data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

9.4 Miscellaneous operating features and conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

9.4.1 SAS physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

9.4.2 Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

9.4.3 Connector requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

9.4.4 Electrical description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

9.4.5 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

9.4.6 SAS transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

9.4.7 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

9.5 Signal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

9.5.1 Ready LED Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

9.5.2 Differential signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

10.0 Seagate Technology support services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

ii Cheetah 15K.4 SAS Product Manual, Rev. B

List of Figures

Figure 1. Cheetah 15K.4 SAS disc drive 1

Figure 2. Typical ST3146854SS drive +12V current profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Figure 3. Typical ST3146854SS drive +5V current profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Figure 4. Typical ST373454SS drive +12V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Figure 5. Typical ST373454SS drive +5V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Figure 6. Typical ST336754SS drive +12V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Figure 7. Typical ST336754SS drive +5V current profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Figure 8. ST3146854SS (3 Gbit) DC current and power vs. input/output operations per second . . . . . . . . . . . . . . . . .31

Figure 9. ST3146854SS (1.5 Gbit) DC current and power vs. input/output operations per second. . . . . . . . . . . . . . . .31

Figure 10. ST373454SS (3 Gbit) DC current and power vs. input/output operations per second . . . . . . . . . . . . . . . . . .32

Figure 11. ST373454SS (1.5 Gbit) DC current and power vs. input/output operations per second. . . . . . . . . . . . . . . . .32

Figure 12. ST336754SS (3 Gbit) DC current and power vs. input/output operations per second . . . . . . . . . . . . . . . . . .33

Figure 13. ST336754SS (1.5 Gbit) DC current and power vs. input/output operations per second. . . . . . . . . . . . . . . . .33

Figure 14. Location of the HDA temperature check point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Figure 15. Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Figure 16. Physical dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Figure 17. Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Figure 18. Air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

Figure 19. Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

Figure 20. SAS connector dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

Figure 21. SAS connector dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

Figure 22. SAS transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61

Figure 23. Receive eye mask. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

Figure 24. Reveive tolerance eye mask. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

Figure 25. Sinusoidal jitter mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

Figure 26. Compliance interconnect test load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

Figure 27. Zero-length test load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

Figure 28. ISI loss example at 3.0 Gbps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

Figure 29. ISI loss example at 1.5 Gbps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

Cheetah 15K.4 SAS Product Manual, Rev. B 1

2 Cheetah 15K.4 SAS Product Manual, Rev. B

1.0 Scope

This manual describes Seagate Technology® LLC, Cheetah® SAS (Serial Attached SCSI) disc drives.

Cheetah drives support the SAS Pr oto co l spec ifi cati ons to the exte nt de sc ribe d in this man ual . The SAS Inter-

face Manual (part number 100293071) describes t he general SAS characteri stics of this and other Se agate

SAS drives.

Figure 1. Cheetah 15K.4 SAS disc drive

Cheetah 15K.4 SAS Product Manual, Rev. B 1

2 Cheetah 15K.4 SAS Product Manual, Rev. B

2.0 Standards, compliance and reference documents

The drive has been developed as a system peripheral to the highest standards of design and construction. The

drive depends on its host equip ment to provide adequate power and e nvironment for optimum performa nce

and compliance with appl icable i ndustry and g overnme ntal regulations. Special attention mu st be given in the

areas of safety, power distribution, s hielding, audible n oise control, and temperature regulat ion. In particular,

the drive must be securely mo unted to guar antee the spe cified pe rformance char acterist ics. Mountin g by bot

tom holes must meet the requirements of Section 8.3.

2.1 Standards

The Cheetah SAS family com pl ies wi th Se aga te s tandar ds a s no ted in the app ropr iat e se cti on s of this ma nual

and the Seagate SAS Interface Manual, part number 100293071.

The Cheetah disc drive is a UL recognized component per UL1950, CSA certified to CAN/CSA C22.2 No. 950-

95, and VDE certified to VDE 0805 and EN60950.

2.1.1 Electromagnetic compatibility

The drive, as delivered , is designed for system integrati on and installation into a suitable encl osure prior to

use. The drive is supplied as a suba ssembly and is not subject to Sub part B of Part 15 of the FCC Rules and

Regulations nor the Radio Interference Regulations of the Canadian Department of Communications.

The design characteristics of the drive serve to minimize radiation when installed in an enclosure that provides

reasonable shielding. T he drive is ca pable of meeting the Cl ass B limits of the FCC Rules and Regulati ons of

the Canadian Department of C omm uni ca tio ns whe n p ro per ly pack ag ed; howe ve r, it is the user’s responsibil ity

to assure that the dri ve meets the approp riate EMI r equirements in thei r system. Sh ielded I/O c ables may be

required if the enclosure does not prov ide adequate shie lding. If the I/O cables are external to the enc losure,

shielded cables should be used, with the shields grounded to the enclosure and to the host controller.

2.1.1.1 Electromagnetic susceptibility

As a component a ssembly, the drive is not requ ired to meet any susc eptibi lity perfor mance requ irements. It is

the responsibilit y of those integrating the dr iv e wit hin the ir sy ste ms to pe rfo rm th os e te sts r eq ui red a nd des ig n

their system to ensure th at equipment operating in the same sy stem as the drive or external to the syste m

does not adversely affect the performance of the drive. See Tables

Cheetah 15K.4 SAS Product Manual, Rev. B 3

2 and 3, DC power requirements.

2.2 Compliance

2.2.1 Electromagnetic compliance

Seagate uses an inde pendent laborato ry to confirm comp liance with the directives/standa rds for CE Markin g and C-Tick Marking. The drive was tested in a representative system for typical applications. The selected sys tem represents the most popular characteristics for test platforms. The system configurations include:

• Typical current use microprocessor

• 3.5-inch floppy disc drive

• Keyboard

• Monitor/display

• Printer

• External modem

•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.

Electromagnetic compliance for the European Union

If this model has the CE Marking it co mplies with the European Union requirements of the El ectromagnetic Compatibility Directive 89 /336/EEC of 03 May 1989 as amend ed by Dir ective 92 /31/ EEC of 28 Apri l 1992 an d Directive 93/68/EEC of 22 July 1993.

Australian C-Tick

If this model has th e C-Tick Marking it complies with the Austr alia/New Zeal and Standard AS/NZS3548 199 5 and meets the Electromagnet ic Compatibility (EMC) Framework requi rements of Australia’s Spectrum Man agement Agency (SMA).

Korean MIC

If this model has the Korean Ministry of Information and Communication (MIC) logo, it complies with paragraph 1 of Article 11 of the Electromagnetic Compatibility (EMC) Control Regulation and meets the Electroma gnetic Compatibility Framework requirements of the Radio Research Laborator y (RRL) Ministry of Information and Communication Republic of Korea.

Taiwanese BSMI

If this model has t wo Chine se words meani ng “E MC ce rtifica tion” follo wed by an eig ht digi t identifi catio n n umber, as a Marking, it complies with Chinese National Standard (CNS) 13438 and meets the Electromagnetic Compatibility (EMC) Fra mework requ irements of the Taiwanese Bureau of Standards, Metrology, and Inspec tion (BSMI).

4 Cheetah 15K.4 SAS Product Manual, Rev. B

2.3 Reference documents

Cheetah 15K.4 SAS Installation Guide

Seagate part number: 100350602

SAS Interface Manual

ANSI SAS Documents

ANSI Small Computer System Interface (SCSI) Documents

Specification for Acoustic Test Requirement and Procedures

Package Test Specification

In case of conflict between this document and any referenced document, this document takes precedence.

Seagate part number: 100293071

SFF-8323 3.5” Drive Form Factor with Serial Connector SFF-8460 HSS Backplane Design Guidelines SFF-8470 Multi Lane Copper Connector SFF-8482 SAS Plug Connector ANSI INCITS.xxx Serial Attached SCSI (SAS) Standard (T10/1562-D) ISO/IEC 14776-xxx SCSI Architecure Model-3 (SAM-3) Standard (T10/1561-D) ISO/IEC 14776-xxx SCSI Primary Commands-3 (SPC-3) Standard (T10/1416-D) ISO/IEC 14776-xxx SCSI Block Commands-2 (SBC-2) Standard (T10/1417-D)

X3.270-1996 (SCSI-3) Architecture Model

Seagate part number: 30553-001

Seagate P/N 30190-001 (under 100 lb.)

Seagate P/N 30191-001 (over 100 lb.)

Cheetah 15K.4 SAS Product Manual, Rev. B 5

6 Cheetah 15K.4 SAS Product Manual, Rev. B

3.0 General description

Cheetah drives combin e giant magnetoresisti ve (GMR) heads, partia l response/maximum likelihood (PRML)

read channel electroni cs, e mbedded servo te chnol ogy, and a Serial Attached SCSI (SA S) inter face t o provid e

high performance, h igh c apaci ty d ata s tor age f or a v ari ety o f sy st ems inc l uding engineering workstations, net

work 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.

Cheetah drives are rando m ac c ess s to ra ge d evic es de si gne d to support the Serial Attached SCS I P rotoc ol as

described in the ANSI spec ifications , this documen t, and the SAS Inte rface Manual ( part number 1002 93071)

which describes the g eneral interface characteristics o f this drive. Chee tah drives are classi fied as intelligen t

peripherals and provide level 2 confo rm ance ( hig hes t lev el) with the A NSI SC SI- 1 s tandard. Th e SA S connec

tors, cables and elec trical interface are com patible with Serial ATA (SATA), giving future user s the choice of

populating their systems with either SAS or SATA hard disc drives. This allows you to continue to leverage your

existing investment in SCSI while gaining a 3Gb/s serial data transfer rate.

The head and disc assembly (HD A) is sealed at the factory. Air recircul ates within the HDA through a non-

replaceable filter to maintain a contamination-free HDA environment.

Note. Never disassemb le the HDA and do not attemp t 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 your warranty.

Cheetah drives use a dedicated landing zone at the innermost radius of the media to eliminate the possibility of

destroying or degrading data by landing in the data zone. The heads automatically go to the landing zone when

power is removed from the drive.

An automatic shipping lock prevents potential damage to the heads and discs that results from movement dur-

ing shipping and h andling. The shipping lock disengages and th e head load process be gins when power is

applied to the drive.

Cheetah 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.

Cheetah 15K.4 SAS Product Manual, Rev. B 7

3.1 Standard features

Cheetah drives have the following standard featur es:

• 1.5 / 3 Gbit Serial Attached SCSI (SAS) interface

• Integrated dual port SAS controller supporting the SCSI protocol

• Support for SAS expanders and fanout adapters

• Firmware downloadable using the SAS interface

• 64 - deep task set (queue)

• Supports up to 32 initiators

• Jumperless configuration.

• User-selectable logical block size (512 to 528 bytes per logical block) in any multiple of 4 bytes.

• Industry standard SFF 2.5-inch dimensions

• Programmable logical block reallocation scheme

• Flawed logical block reallocation at format time

• Programmable auto write and read reallocation

• Reallocation of defects on command (Post Format)

• ECC maximum burst correction length of 320 bits

• No preventive maintenance or adjustments required

• Dedicated head landing zone

• Embedded servo design

• Automatic shipping lock

• Embedded servo design

• Self diagnostics performed when power is applied to the drive

• Zone bit recording (ZBR )

• Vertical, horizontal, or top down mounting

• Dynamic spindle brake

• 8,192 Kbyte data buffer (see Section 4.5).

• Drive Self Test (DST)

• Background Media Scan (BGMS)

•Power Save

3.2 Media description

The media used on the drive has an alumi num sub st rat e co ated with a thin fi lm magn eti c mater ia l, over coate d with a proprietary protective layer for improved durability and environmental protection.

3.3 Performance

• Programmable multi-segmentable cache buffer

• 300 Mbytes/sec maximum instantaneous data transfers.

• 15k RPM spindle. Average latency = 2.0 msec

• Background processing of queue

• Supports start and stop commands (spindle stops spinning)

• Adaptive seek velocity; improved seek performance

8 Cheetah 15K.4 SAS Product Manual, Rev. B

3.4 Reliability

• Annualized Failure Rate (AFR) of 0.62%

• LSI circuitry

• Balanced low mass rotary voice coil actuator

• Incorporates industry-standard Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.)

• 5-year warranty

3.5 Formatted capacities

Standard OEM models are formatted to 512 bytes per block. The block size is sele ctable at format time an d

must be a multiple of 4 by tes. Users having the necessary equi pment may modify the data block size before

issuing a format command and obtain different formatted capacities than those listed.

To provide a stable target capacity environment and at the same time provide users with flexibility if they

choose, Seagate recommends product planning in one of two modes:

1. Seagate designs specify capacit y p oi nts at cer tain b lock siz es tha t S eag ate guarantees current and fut ur e products will meet. We recommend custo mers use this capacity in their project pl anning, as it ensures a stable operating point with backw ard and forward c ompatibi lity from gener ation to generati on. The curren t guaranteed operating points for this product are:

Capacity (Blocks)

ST3146854SS ST373454SS ST336754SS

Sector Size

Decimal Hex Decimal Hex Decimal Hex

512 286,749,488 11177330 143,374,744 88BB998 71,687,372 445DCCC 514 282,050,768 10CFC0D0 141,025,384 867E068 70,512,692 433F034 520 280,790,184 10BC84A8 140,395,092 85E4254 70,197,546 42F212A 522 279,041,740 10A1D6CC 139,463,602 8500BB2 68,914,176 41B8C00 524 275,154,368 106685C0 137,577,184 83342E0 68,766,592 4194B80

2. Se aga te dri ve s a ls o m ay be u se d at the max im um av ail ab le c apacit y at a given block size, but the excess capacity above the gua rantee d l ev el wi ll v ar y between other drive fami li es an d from generation to genera tion, depending on how eac h block size actually formats out for zo ne frequencies and splits over servo bursts. This added capaci ty potent ial may range from 0.1 to 1.3 percent above th e guarant eed capacities listed above. Us ing th e dr ives in th is mann er gi ves the ab so lute m aximu m capacity poten tial, but the user must determine if the extra ca pacity potential is useful, or whether their assurance of backward and for ward compatibility takes precedenc e.

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 Ma nual, part numb er 100293071. A value of z ero 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 z er o a nd less tha n t he maximum number of L BA s in the Num ber of B lock s field c han ges the tota l d rive capacity t o t he v al u e in t h e N umb er o f Bl o cks f ie l d. A v al u e gr ea t er t han t h e m ax im u m nu m be r of LBAs is rounded down to the maximum capacity.

3.7 Factory-install ed accessories

OEM standard drives are shipped with the Cheetah 15K.4 SAS Installation Guide (part number 100350602).

Cheetah 15K.4 SAS Product Manual, Rev. B 9

3.8 Factory-install ed options

You may order the following items which ar e incorporated at the manufac turing facility during produ ction 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 protec tion 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 Cheetah 15K.4 SAS Installatio n Guid e, part numb er 1003 50602, is u suall y included with each standar d OEM drive shipped, but extra copies may be ordered.

• The Safety and Regulatory Agency Specifications, part number 75789512, is usually included with each standard OEM drive shipped, but extra copies may be ordered.

3.9 User-installed accessories

The following accessories are available. All kits may be installed in the field.

• Single-unit shipping pack.

10 Cheetah 15K.4 SAS Product Manual, Rev. B

4.0 Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Cheetah drives.

4.1 Internal drive characteristics

ST3146854SS ST373454SS ST336754SS

Drive capaci ty 146.8 73.4 36.7 Gbytes (formatted, rounded off value) Read/write data heads 8 4 2 Bytes per track 471,916 471,916 471,916 Bytes (average, rounded off values) Bytes per surface 18,351 18,351 18,351 Mbytes (unformatted, rounded off value) Tracks per surface (total) 50,864 50,864 50,864 Tracks (user accessible) Tracks per inch 85,000 85,000 85,000 TPI Peak bits per inch 628 628 628 KBPI Internal data rate 685-1,142 685-1,142 685-1,142 Mbits/sec (variable with zone) Disc rotation speed 15k 15k 15k rpm Avg rotational latency 2.0 2.0 2.0 msec

4.2 Seek performance characteristics

See Section 9.4.1, "SAS physical interface" on page 57 and the SAS Interface Manual (part number

100293071) for additional timing details.

4.2.1 Access time

Not Including controller overhead (msec)

Read Write

Average Typical 3.5 4.0 Single track Typical 0.2 0.4 Full stroke Typical 7.4 7.9

1. Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives.

2. Access to data = access time + latency time.

1, 2

Cheetah 15K.4 SAS Product Manual, Rev. B 11

4.2.2 Format command execution time (minutes)

ST3146854SS ST373454SS ST336754SS

Maximum (with verify) Maximum (without veri fy )

90 60 30 45 30 15

4.2.3 General performance characteristics

Minimum sect or interleave 1 to 1

Data buffer to/from disc media (one 512-byte logical block)*

Minimum 685 Mbits/sec Maximum 1,142 Mbits/sec

SAS Interface maximum instantaneous transfer rate 300 Mbytes/sec* per port

Logical block sizes

Default is 512-byte data blocks Variable 512 to 704 byt es per sector in even number of bytes per sector. If n (number of bytes per sector) is odd, then n-1 will be used.

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.)

Average rotation al lat enc y 2.0 msec

*Assumes no errors and no relocated logical blocks. Rate measured from the start of the first logical block transfer to or from the host.

(dual port = 600 Mbytes/sec*)

Negligible

4.3 Start/stop time

The drive accepts the comma nds list ed in the SAS Inte rface Man ual 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 20 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 N OTIFY (ENABLE SPINUP) primit ive. After receiving a NOTIFY (ENA BLE SPINUP) primitive throu gh either port, the drive becomes ready for normal operations within 20 seconds (excluding the error recovery procedure).

12 Cheetah 15K.4 SAS Product Manual, Rev. B

If the drive receives a START STOP UNIT command with the START bit and IMMED bit equal to 1 and d oes not receive a NOTIFY (ENABL E SPINUP) primitive within 5 seco nds, 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 30 seconds (maximum) from removal of DC power. There is no power control switch on the drive.

4.4 Prefetch/multi-segmented cache control

The drive provides a prefetch ( read look-ahead) and multi-se gmented cache control algori thms that in many cases can enhan ce system performance. Cac he refers to the drive buffer stor age space when it is used in cache operations . To select this feature, th e host sends the Mode Select command with the p roper values in the applicable bytes in page 08h. Prefetch and cache operations are independent features from the standpoint that each is enabled and dis abled indepe ndently using the Mode Select c ommand; however, in actual opera tion, the prefetch feature overlaps cache operation somewhat as described in sections 4.5.1 and 4.5.2.

All default cache and prefetch mode paramete r values (Mode Page 08 h) for standard OEM versions of this drive family are given in Table

9.3.2.1.

4.5 Cache operation

Note. Refer to the SAS Interface Manual for more detail concerning the cache bits.

Of the 8,192 kbytes p hysical buffer space in the dri ve, approximately 7,077 kbytes can be u sed as a cache. The buffer can be divided into logical segments (using Mode Select Page 08h, byte 13) from which data is read and to which data is written.

The drive keeps track of the logical block addresses of the data stor ed 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 disc access is initiated. If cache operation is not enabled, the buffer (still segmented with the required number of segments) is still used, but only as circular buffer segments during disc medium read oper ations (di sregardin g Prefetch oper ation for th e moment). That i s, 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 throug h some buffer seg ment on the wa y to the hos t. On a c ache miss, all data transfers to the host are in accorda nce with bu ffer-full ratio rules. On a c ache hit , the drive ig nores the bufferfull 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 the first logical block is already in the cache:

1. Drive transfers to the initiator the first logical block requested plus all subsequent contiguous logical blocks

that are already in the cache. This data may be in multiple segments.

2. Wh en a requested logical block is reached that is not in any cache se gment, the d rive fetches it and any

remaining requested lo gical b lock a ddres ses from th e disc and puts them in a seg ment o f the cache . The drive transfers the r emaining requested logical blocks from t he cache to the host in a ccordance with the Mode Select Disconnect/Reconnect parameters, page 02h.

3. If the prefetch feature is enabled, refer to section 4.5.2 for operation from this point. Case B—A Read command requests data, and the first logical block is not in any segment of the cache:

1. The drive fetc hes the req uested lo gical bloc ks from t he disc and transfers them int o a segme nt, and the n

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 4.5.2 for operation from this point.

Cheetah 15K.4 SAS Product Manual, Rev. B 13

During a prefetch, the drive cross es a cylinder boundary to fetc h data only if the Disco ntinui ty (DISC) bit is se t to 1 in bit 4 of byte 2 of the Mode Select parameters page 08h. Default is zero for bit 4.

Each cache se gment is actually a s elf-contained circula r buffer whose length is an integer number of logical blocks. The wrap-ar ound capability of the individual segm ents greatly enhances the cache’s overa ll perfor mance, allowing a wide range of user-sele ctable configurations. The d rive supports operation of any integer number of segments from 1 to 16. D ivide the 7 ,077 Kbyt es in the b uffer by the numbe r of seg ments to get the segment size. Default is 3 segments.

Note. The size of eac h 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 segm ent . Se ndi ng a siz e specification using the Mode Select command (byt es 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 driv e respon ds as it does for any attempt to change an unchangeable parameter.

4.5.1 Caching write data

Write caching is a write operation by the drive th at mak es u se of a drive buffer storage ar ea wher e the da ta 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 s ame buffer space an d segme ntation is use d as set up for read func tions. The buffer segmentation s cheme is set up or changed independently, having nothing to do with the state of RCD. When a write command is issued, i f RCD=0, the cache is first checke d to see if any logical blocks tha t are to be written are a lready stored in the cache f rom a previous read or write comman d. 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 befor e the data has been written to the medium. If an error oc curs while writing the data to the medium, and Good status has already been returned, a deferred error will be gen erated.

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 9.3.2.1 shows the mode default settings for the drive.

4.5.2 Prefetch operation

If the Prefetch fea ture i s ena bl ed, data in co nti guo us lo gic al b lock s on t he d is c immediately beyond tha t whi c h was requested by a Read c ommand are retrieved and stored in the buffer for immediate transfer from the buffer to the host on subseque nt Read com mands that request t hose logica l block s (this is tr ue 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 Mod e Select page 08h, byte 12, bit 5 (Di sable Read Ahead - DRA bit). DRA bit = 0 enables prefetch.

Since data that is pr efetch ed r eplaces data alr eady in som e b uffer segmen ts, the ho st can limit the a mount o f prefetch data to optimize system per formance. The Max Prefetch field (bytes 8 and 9) limits the amount of prefetch. The drive does not use the Prefetch Ceiling field (bytes 10 and 11).

14 Cheetah 15K.4 SAS Product Manual, Rev. B

During a prefetch operation, the drive cros ses a cylinder boundary to fetch more data only if Mode paramete rs page 08h, byte 2, bit 4 is set to 1 (Discontinuity--DISC bit).

When prefetch (read look -ahead) is enabled (enabled by DRA = 0), it opera tes under the control of ARLA (Adaptive Read Look-Ahead). If the host uses software interleave, ARLA enables prefetch of contiguous blocks from the disc when it senses that a prefetch hit will likely occur, even if two consecutive read operations were not for physically co ntiguous blocks of data (e.g. “software interleave ”). ARLA disables pr efetch when it decides that a prefetch hit will not likely occur. If the host is not using software interleave, and if two sequential read operations are no t for c ontigu ous bloc ks of data, ARLA d isables prefetc h, but as long as se quentia l read operations request contiguous blocks of data, ARLA keeps prefetch enabled.

4.5.3 Optimizing cache performance for desktop and server applications

Desktop and server applications require different drive caching operations for optimal performance. This means it is difficult to provide a single configuration that meets both of these needs. In a desktop environment, you want to con figure the cache to respond q uickly to repetitive ac cesses of multiple s mall segmen ts of data without taking the time to “look ahea d” to the next conti guous segmen ts of data. In a server environ ment, you want to configure the cac he to provide large volumes of seque ntial data in a non-repetitive manner. In this case, the ability of the cache to “look ahead” to the next contiguous segmen ts of sequential data is a good thing.

The Performance Mode (PM) bit contr ols the way the drive switches the cache buffer into different modes o f segmentation. In “server mode” (PM bit = 0), the drive can dynamically cha nge the number of cache buffer segments as needed to opt imize the performa nce, based on the command st ream from the hos t. In “desktop mode” (PM bit = 1), the number of segments is maintained at the value defined in Mode Page 8, Byte 13, at all times (unless changed by using a Mode Select command). For additional information about the PM bit, refer to the Unit Attention Pa rameters page (00h) of the Mod e Sense command (1Ah) in the SAS Interface Manual, part number 100293071.

Cheetah 15K.4 SAS Product Manual, Rev. B 15

16 Cheetah 15K.4 SAS Product Manual, Rev. B

5.0 Reliability specifications

The following reli ability specifica tions assume co rrect host and drive operational interfa ce, including al l interface timings, power supply voltages, environmental requirements and drive mounting constraints.

Seek error rate: Less than 10 errors in 108 seeks Read Error Rates

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 Annualized Failure Rate (AFR): 0.62% (see section 5.2.1) Service Life 5 years Preventive maintenance: None required

1. Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.

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 p ower as defined in paragraph 6.2, "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, ARR E, full read retries, full write retries and full retry time.

5.1.1 Recoverable Errors

Recovereable errors are those detected and corrected by the drive, and do not require user intervention. Recoverable Data errors will use co rrection, although ECC on -the-fly is not c onsidered for purposes of recov-

ered error specifica tio ns. Recovered Data error rate is determine d using read bits transfer red for recove rable errors occurring dur ing a

read, and using write bits transferred for recoverable errors occurring during a write.

5.1.2 Unrecoverable Erro rs

An unrecoverable data erro r is defined as a fail ure of the drive to rec over data from the me dia. These errors occur due to head/medi a or write problems . Unrecoverable data errors are only detected du ring read opera tions, but not caused by the r ead. If an unrec overable data erro r is detected, a ME DIUM ERROR (03 h) in the Sense Key will be reported. Multiple unrecoverable data errors resulting from the same cause are treated are 1 error.

Cheetah 15K.4 SAS Product Manual, Rev. B 17

5.1.3 Seek errors

A seek error is defined as a fail ur e of the dr i ve to pos it ion 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 reporte d with a Hardware error (04h) in t he Sense Key. Recoverab le seek er rors are sp ecifi ed at Less than 10 erro rs in 10

seeks. Unrecoverable seek errors

(Sense Key = 04h) are classified as drive failures.

5.1.4 Interface errors

An interface error is defin ed as a failure of the receiver on a port to recover the d ata 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.

5.2 Reliability and service

You can enhance the r eliability of Cheetah disc drives by ensuring that the drive recei ves adequate cooling. Section 6.0 provides te mperature mea surements and othe r informatio n that may be used to en hance the service life of the drive. Section 8.2 provides recommended air-flow information.

5.2.1 Annualized Failure Rate (AFR)

The production disc dr ive shall achieve an AFR of 0.62% when oper ated in an environmen t that ensures the HDA case temperatur es spec ified in Sectio n 6. 4 are not exce eded. S hort -term ex cursi ons u p to th e spec ification limits of the operating e nvironment will not affect AFR perfor mance. Continual or sustained operation at case temperatures above the values shown in Section 6.4.1 may degrade product reliability.

Estimated power-on operation hours means power-up hours per disc drive times the total number of disc drives in service. Ea ch dis c drive shall h ave accu mulate d at le ast nine months of operatio n. Data sha ll be ca lculated on a rolling average base for a minimum period of six months.

AFR is based on the following assumption s:

• 8,760 power-on hours per year.

• 250 average on/off cycles per year.

• Operations at nominal voltages.

• Systems will provide adequa te cooling to ensure the case temper atures specified in Section 6.4.1 are not exceeded.

Drive failure means any stoppage or substandard performance caused by drive malfunction. A S.M.A.R.T. predictive fail ure indic ates that the dri ve is deter iorating to an immin ent failu re and is co nside red

an AFR hit.

5.2.2 Preventive maintenance

No routine scheduled preventive maintenance is required.

5.2.3 Hot plugging the drive

When a disc is powered on by switchin g the powe r or hot plugged, the drive run s a self test befor e attemp ting to communicate o n its’ interfaces. When the self test co mpletes successfull y, the drive initiates a Link R eset starting with OOB. An attached devic e should respond to the link rese t. If the link reset attempt fails, or any time the drive looses sync, the drive initiated l ink reset. The drive will i nitiate link reset once p er second but alternates between por t A and B. Therefor e each port will atte mpt a link reset on ce per 2 seconds assuming both ports are out of sync..

If the self-test fails, the does not respond to link reset on the failing port.

18 Cheetah 15K.4 SAS Product Manual, Rev. B

Note. It is the respon si bi li ty o f the sy s tems in tegrator to assure that no tem per atu re, energy, voltage haz-

ard, or ESD potential haza rd is presented dur ing the hot connect/di sconnect oper ation. Discharge the static electricity from the drive carrier prior to inserting it into the system.

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.

5.2.4 S.M.A.R.T.

S.M.A.R.T. is an acronym for Se lf-Moni toring Analy sis and Repor ting Technology. This technology is intende d to recognize conditio ns that indicate imminent drive failure and is desig ned to provide sufficient warn ing of a failure to allow you to back up the data before an actual failure occurs.

Note. The drive’s firmware monitors specific attributes for degradation over time but can’t predict instanta-

neous drive failures.

Each monitored a ttrib ute has b een sele cted to moni tor a specifi c se t of fai lure c onditi ons in th e oper ating per formance 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 th e DEXCPT bit to ena ble or disab le the S.M.A.R. T. feature. Se tting the DE X CPT 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 consi dered to be in “On-line Mod e Only” and will not perform off-line functions.

You can measur e off-line attributes a nd force the dri ve to save the data by using the Rez ero Unit command . Forcing S.M.A.R.T. resets the timer so that the next scheduled interrupt is in two hours.

You 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 you to c ontrol when S.M.A.R.T. interruptions occ ur. 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 disc so that the events that caused a predi ctive failure can be recreated. The drive measures and saves paramete rs once every two hour s subject to an idle pe riod on the drive interfaces. The pro cess o f meas uring off-line attribute data a nd sa ving data to th e disc is u ninterr uptable. Th e maximum on-line only processing delay is summarized below:

Maximum processing delay

S.M.A.R.T. delay times

On-line only delay DEXCPT = 0, PERF = 1

50 milliseconds

Fully-enabled delay DEXCPT = 0, PERF = 0

300 milliseconds

Cheetah 15K.4 SAS Product Manual, Rev. B 19

Reporting control

Reporting is controlled by the MRIE bits in the Inform ational Exceptio ns Control mode page (1Ch). Subject to the reporting metho d, t he firmw are w ill is sue to the h ost a n 0 1-5Dxx sense code. The error code is pr eserve d 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 attribu te. The in terval de fine s the numb er of operati ons over which to mea sure 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 an d their inte rval. If the nu mber of error s exceed s the thr eshold bef ore the interval expires, the error rate i s considered to be unacc eptable. 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 inter val and failure counters are reset and the process starts over.

Predictive failures

S.M.A.R.T. signals predict ive failures when the dri ve is perfor ming unacc eptably for a period of time. Th e firmware keeps a running count of the number of times the error rate for each attribute is unacceptable. To accomplish this, a cou nter is i ncremen ted each time the error rat e is un acceptable and decr emented (not to e xceed zero) whenever t he error ra te is a cceptabl e. If the co unter contin ually in crem ents such that it reache s the pr e dictive threshol d, a predictive failure is signaled. This counter is r eferred to as the Failure H istory Counter. There is a separate Failure History Counter for each attribute.

5.2.5 Thermal monitor

Cheetah drives implement a temperature warning sy s tem whic h:

1. Signals the host if the temperature exceeds a value which would threaten the drive.

2. Signals the host if the temperature exceeds a user-specified value.

3. Saves a S.M.A.R.T. data frame on the drive which exceeds the threatening temperature value.

A temperature sensor monito rs the drive temperature and is sues a warning over the int erface when the temperature exceeds a s et threshol d. The temper ature is measured at power-up an d then at te n-minute intervals after power-up.

The thermal monitor syste m generates a warn ing code of 01- 0B01 when the temp erature exceeds th e specified limit in compl iance with the SCSI standard. T he drive temperature is repo rted in the FRU code field o f mode sense data. You can use this information to determine if the warning is due to the temperature exceeding the drive threatening temperature or the user-specified temperature.

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).

The current algorithm impl ements two temperature trip points. The first trip point is set at 65°C which is the maximum temperatur e limit a ccordi ng to th e dri ve spec ific ation. Th e seco nd trip point is us er-se lectable using the Log Select command. The reference temperature parameter in the temperature log page (see Table

1) can

20 Cheetah 15K.4 SAS Product Manual, Rev. B

be used to set this trip point. The default value for this drive is 65°C, however, you can set it to any value in the range of 0 to 65°C. If you specify a temperature g reater than 65°C in this fi eld, the temperature is rou nded down to 65°C. A sense code is sent to the host to indicate the rounding of the parameter field.

Table 1: Temperature Log Page (0Dh)

Parameter Code Description

0000h 0001h

Primary Temperature Reference Temperature

5.2.6 Drive Self Test (DST)

Drive Self Test (DST) is a technology designed to recog nize 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 text 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 s hort test is time-r estricted and limited i n length—it does n ot scan the entire media surface, but does some fundamental tests and scans portions of the media.

If DST encounters an er ror during either of these tests, i t reports a fault condition. If the driv e fails the test, remove it from service and return it to Seagate for service.

5.2.6.1 DST failure definition

The drive will presen t a “diagnostic failed” con dition through the self-te sts results value of the diagnos tic log page if a functional failur e is enco untered du ring DST. The channel and servo parameters are not mod ified to test the drive more strin gently, and the number of retries are not redu ced. All retries and recovery proce sses 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.

5.2.6.2 Implementation

This section provides all of the information necessary to implement the DST function on this drive.

Cheetah 15K.4 SAS Product Manual, Rev. B 21

5.2.6.2.1 State of the drive prior to testing

The drive must be in a ready state before issuing the Send Diagno stic command . There are multipl e 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 disc

In these conditions, the drive responds to a Test Unit Ready command with an 02/04/00 or 02/04/03 code.

5.2.6.2.2 Invoking DST

To invoke DST, submit th e Send Dia gnostic com mand with th e appropria te Function Code (001b for the shor t test or 010b for the extended test) in bytes 1, bits 5, 6, and 7.

5.2.6.2.3 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 th ree s egm ents: a n el ec tric al test segm ent, a servo test segment , and a re a d/ver ify sca n

segment.

Short test (Function Code: 001b)

The purpose of the short test is to prov ide a ti me- l imi ted te st tha t tests as much of the drive as poss ib le wi thi n 120 seconds. The shor t test does not scan the entire me dia surface, but does some fu ndamental 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 tes t the pos it ion ing mec han ism. T he read op erati on tes ts the read hea d ele men t and the media surface. The write element is tested throu gh read/write/read operations. The inte grity of the media is checked through a r ead/verif y scan of the med ia. Motor functio nality is tested by d efault as a part of these tests.

The anticipated length of the Extended test is reported through the Control Mode page.

5.2.6.2.4 Log page entries

When the drive begi ns DST, it creates a new entry in the Se lf -test Res ul ts Log page. T he new entry is cr eate d by inserting a new self-test parameter block at the beginning of the self-test results log parameter section of the log page. Existing d ata will be moved to make ro om f or the new param eter b lock . T he driv e r ep or ts 20 param eter 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

22 Cheetah 15K.4 SAS Product Manual, Rev. B

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 dr i ve upda tes the Self-Test Results Value field in its Self-

Test Results Log page in non-v ola til e m emo ry. The host may use Log Se nse to re ad th e r es ults from up to th e 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 th e failure condition and LBA (i f applicable) in the Self-tes t Results Log parameter. The Sense key, ASC, ASCQ, and FRU are used to report the failure condition.

5.2.6.2.5 Abort

There are several ways to abort a diagnostic. You can use a SCSI Bus Reset or a Bus Device Reset message to abort the diagnostic.

You can abort a DST ex ecuting in b ackground m ode by us ing the abort c ode in the DS T Function Cod e field. This will cause a 01 ( self-test aborted b y the application cl ient) code to appear i n the self-test results v alues log. All other abort mechanisms will be reported as a 02 (self-test routine was interrupted by a reset condition).

5.2.7 Product warranty

Beginning on the da te of shipment to the customer and contin uing for the period spe cified in your purchas e contract, Seagate wa rra nts that e ach pro duct (i nclud ing com pon ents and su basse mblie s) that fails t o fu nction properly under normal use due to defect in materials or workmanship or due to nonconformance to the applica ble specifications will be repaired or replaced, at Seagate’s option and at no charge to the customer, if returned by customer at cus tomer’s expense to S eagate’s designated facility in ac cordance with Seagate’s warranty procedure. Seagate will pay for tr an sp or tin g th e repa ir or rep lac em ent ite m t o th e c us tome r. For more detailed warranty information, refer to the standard terms and conditions of purchase for Seagate products on your pur chase documentation.

The remaining warranty for a particular drive can be determined by calling Seagate Customer Service at 1-800-468-3472. You can also determine remain ing war ranty using the Seagate web si te (www.seagate.com) . The drive serial number is required to determine remaining warranty information.

Shipping

When transporting or shipping a drive, use only a Seagate-approved container. Keep your 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 refus e rece ipt of compo nents impro perly packaged or obviou sly damag ed in transit. Contact your author ized Seag ate distr ibutor to purchas e additio nal boxe s. Seagat e recom mends sh ipping by an air-ride carrier experienced in handling computer equipment.

Product repair and return information

Seagate customer se rvice centers are th e only facilities au thorized to service S eagate drives. Seag ate does not sanction any third-party repair facilities. Any unauthorized repair or tamper ing with the factory seal voids the warranty.

Cheetah 15K.4 SAS Product Manual, Rev. B 23

24 Cheetah 15K.4 SAS Product Manual, Rev. B

6.0 Physical/electrical spe cifications

This section provides information relating to the physical and electrical characteristics of the drive.

6.1 AC power requirements

None.

6.2 DC power requirements

The voltage and current requi rements for a single drive are shown below. Values indicated apply at the drive connector.

Table 2: ST3146854SS DC power requirements

ST3146854SS 3 Gbit mode

Notes

Voltage +5V +12V [2] +5V +12V [2] Regulation [5] ±5% ±5% [2] ±5% ±5% [2] Avg idle current DCX [1] [7] 1.02 0.77 1.08 0.77 Maximum starting current

(peak DC) DC 3σ [3] 1.21 1.82 1.23 1.82

(peak AC) AC 3σ [3] 1.67 3.89 1.67 3.88 Delayed motor start (max) DC 3σ [1] [4] 1.03 0.04 1.02 0.04 Peak operating current: Typical DCX [1] [6] 1.12 1.17 1.04 1.17 Maximum DC 3σ [1] 1.15 1.19 1.12 1.20 Maximum (peak) DC 3s 1.70 2.86 1.70 2.90

(Amps) (Amps) (Amps) (Amps)

ST3146854SS

1.5 Gbit mode

Cheetah 15K.4 SAS Product Manual, Rev. B 25

Table 3: ST373454SS DC power requirements

ST373454SS 3 Gbit mode

Notes

Voltage +5V +12V [2] +5V +12V [2] Regulation [5] ±5% ±5% [2] ±5% ±5% [2] Avg idle current DCX [1] [7] 1.02 0.56 1.07 0.56 Maximum starting current

(peak DC) DC 3σ [3] 1.20 1.76 1.21 1.78

(peak AC) AC 3σ [3] 1.62 3.79 1.56 3.87 Delayed motor start (max) DC 3σ [1] [4] 1.03 0.04 0.91 0.04 Peak operating current: Typical DCX [1] [6] 1.12 0.95 1.00 0.94 Maximum DC 3σ [1] 1.13 0.96 1.02 0.96 Maximum (peak) DC 3s 1.64 2.70 1.52 2.74

(Amps) (Amps) (Amps) (Amps)

ST373454SS

1.5 Gbit mode

Table 4: ST336754SSDC power requirements

ST336754SS 3 Gbit mode

Notes

Voltage +5V +12V [2] +5V +12V [2] Regulation [5] ±5% ±5% [2] ±5% ±5% [2] Avg idle current DCX [1] [7] 1.01 0.44 1.07 0.44 Maximum starting current

(peak DC) DC 3σ [3] 1.17 1.58 1.20 1.59

(peak AC) AC 3σ [3] 1.65 3.43 1.52 3.39 Delayed motor start (max) DC 3σ [1] [4] 1.02 0.04 0.91 0.04 Peak operating current: Typical DCX [1] [6] 1.12 0.83 1.01 0.83 Maximum DC 3σ [1] 1.14 0.85 1.02 0.85 Maximum (peak) DC 3s 1.64 2.56 1.52 2.58

(Amps) (Amps) (Amps) (Amps)

ST336754SS

1.5 Gbit mode

[1] Measured with average reading DC ammet er. Instantaneous +12V current peaks wi ll exceed these val-

ues. Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.

[2] For +12 V, a –10% toler an ce is a llowed du ri ng in iti al sp in dle s tart bu t m ust retu rn to ±5% before re ac hin g

14,904 RPM. The ±5% must be maintained after the drive signifi es that its power-up sequen ce has bee n completed and that the drive is able to accept selection by the host initiator.

[3] See +12V current profile in Figure 2.

26 Cheetah 15K.4 SAS Product Manual, Rev. B

[4] This condition occurs after OOB and Speed Negotiation compl etes but b efore the dr ive has r eceived th e

Notify Spinup primitive.

[5] See paragraph 6.2.1, "Conducted noise immunity." Specified voltage toleran ce in cl ud es rip ple, noise, and

transient response.

[6] Operating condition is defined as random 8 block reads with 225 I/Os per second for ST3146854SS

drives, 230 I/Os per se cond for ST373454SS dr ives, and 230 I/Os per se cond for ST336754SS dr ives. Current and power sp ecified at no minal voltages . Decreasi ng +5 volt s upply by 5 % increase s 5 volt cur rent by 2.5%. Decreasing +12 volt supply by 5% i ncreases 12 volt current by 3.0% for ST3146854SS models, 2.0% for ST3734 54S S mod els , and 2 .0% for ST336754SS models.

[7] During idle, the drive he ads are relocated every 60 seconds to a random location within the band from

three-quarters to maximum track.

General DC power requirement notes.

1. Minim um cu rrent load ing for eac h supply voltage is n ot less than 1. 7% of the ma ximum o perating current shown.

2. The +5V and +12V supplies should employ separate ground returns.

3. Where power is provided to multiple drives from a comm on supply, careful consideration for individual drive power requirem ents s hou ld b e no ted. Whe re mu lti ple uni ts ar e pow er ed o n simu lta neou sl y, 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.

6.2.1 Conducted noise immunity

Noise is specified a s a periodic an d random distri bution of frequenc ies covering a band from DC to 10 MHz. Maximum allowed no ise values given below are peak-to -peak measurements and apply at the dr ive power connector.

+5V +12V

0 to 100 kHz 150mV 150mV 100 kHz to 10 MHz 100mV 100mV

6.2.2 Power sequencing

The drive does not require power sequenci ng. The drive prote cts against inadver tent writing dur ing power-up and down.

6.2.3 Current profiles

The +12V and +5V current profiles for ST3146854SS, ST373454SS and ST336754SS models are shown below in the following figures.

Note: All times and currents are typical. See Tables 2 and 3 for maximum current requirements.

Cheetah 15K.4 SAS Product Manual, Rev. B 27

Figure 2. Typical ST3146854SS drive +12V current profile

Figure 3. Typical ST3146854SS drive +5V current profile

28 Cheetah 15K.4 SAS Product Manual, Rev. B

Figure 4. Typical ST373454SS drive +12V current profile

Figure 5. T yp ical ST373454SS drive +5V current profile

Cheetah 15K.4 SAS Product Manual, Rev. B 29

Figure 6. Typical ST336754SS drive +12V current profile

Figure 7. T yp ical ST336754SS drive +5V current profile

30 Cheetah 15K.4 SAS Product Manual, Rev. B

6.3 Power dissipation

ST3146854SS in 3 Gbit operation

Typical power dissipation under idle conditions in 3Gb operation is 14.34 watts (48.93 BTUs per hour). To obtain operating power for typical random read ope rations , refer to the following I/O rate cur ve (see Figure

8). Locate the typica l I/O rate for a drive i n your sys tem on the h orizontal axi s and read th e corres ponding + 5

volt current, +12 vol t cur r ent, and total wa tts on the v erti ca l a xis . To calculate BTUs per hour, multiply watts by

3.4123.

ST3146854SS DC CURRENT/POWER vs THROUGHPUT (3 Gbit)

Amperes

1.800

1.600

1.400

1.200

1.000

0.800

0.600

Random 8 Block Reads

20.00

18 .0 0

16 .0 0

14 .0 0

12 .0 0

10 .0 0

8.00

6.00

5Volt A 12 V o l t A Watts

Power (watts)

0.400

0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0

4.00

I/Os per Second

Figure 8. ST3146854SS (3 Gbit) DC current and power vs. input/output operations per second

ST3146854SS in 1.5 Gbit operation

Typical power dissipation under idle conditions in 1.5 Gbit operation is 14.64 watts (49.96 BTUs per hour). To obtain operating power for typical random read ope rations , refer to the following I/O rate cur ve (see Figure

8). Locate the typica l I/O rate for a drive i n your sys tem on the h orizontal axi s and read th e corres ponding + 5

volt current, +12 vol t cur r ent, and total wa tts on the v erti ca l a xis . To calculate BTUs per hour, multiply watts by

3.4123.

ST3146854SS DC CURRENT/POWER vs THROUGHPUT (1.5 Gbit)

1.800

1.600

1.400

1.200

1.000

Amperes

0.800

0.600

Random 8 Block Reads

20.00

18 . 00

16 . 00

14 . 00

12 . 00

10 . 00

8.00

6.00

5Volt A 12 Vo l t A Watts

Power (watts)

0.400

0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0

Figure 9. ST3146854SS (1.5 Gbit) DC current and power vs. input/output operations per second

Cheetah 15K.4 SAS Product Manual, Rev. B 31

4.00

I/Os per Second

ST373454SS in 3 Gbit operation

Typical power dissipation under idle conditions in 3Gb operation is 11.8 watts (40.27 BTUs per hour). To obtain operating power for typical random read ope rations , refer to the following I/O rate cur ve (see Figure

8). Locate the typica l I/O rate for a drive i n your sys tem on the h orizontal axi s and read th e corres ponding + 5 volt current, +12 vol t c ur rent, and tota l wa tts on the v er ti cal a xi s. To calculate BTUs per hour, multiply watts by

3.4123.

ST373454SS DC CUR RENT/POWER vs THROUGHPUT (3 Gbit )

1.800

1.600

Random 8 Block Reads

18 .0 0

16 .0 0

5Volt A 12 Vo l t A Watts

1.400

1.200

1.000

Amperes

0.800

0.600

0.400

0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0

14 .0 0

12 .0 0

10 .0 0

8.00

6.00

4.00

Power (watts)

I/Os per Second

Figure 10. ST373454SS (3 Gbit) DC current and power vs. input/output operations per second

ST373454SS in 1.5 Gbit operation

Typical power dissipation under idle conditions in 1.5 Gbit operation is 12.0 watts (40.95 BTUs per hour). To obtain operating power for typical random read ope rations , refer to the following I/O rate cur ve (see Figure

3.4123.

ST373454SS DC CURRE NT/POWER vs THROUGHPUT (1.5 Gbit)

1.8 00

1.6 00

Rando m 8 Block R eads

18 .0 0

16 .0 0

5Volt A 12 V o lt A Watts

1.4 00

1.2 00

1.0 00

Amperes

0.800

0.600

0.400

0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0

I/Os per Second

Figure 11. ST373454SS (1.5 Gbit) DC current and power vs. input/output operations per second

32 Cheetah 15K.4 SAS Product Manual, Rev. B

14 .0 0

12 .0 0

10 .0 0

8.00

6.00

4.00

Power (watts)

ST336754SS in 3 Gbit operation

Typical power dissipation under idle conditions in 3Gb operation is 10.33 watts (35.25 BTUs per hour). To obtain operating power for typical random read ope rations , refer to the following I/O rate cur ve (see Figure

8). Locate the typica l I/O rate for a drive i n your sys tem on the h orizontal axi s and read th e corres ponding + 5

volt current, +12 vol t cur r ent, and total wa tts on the v erti ca l a xis . To calculate BTUs per hour, multiply watts by

3.4123.

ST336754SS DC CURRENT/POWER vs THROUGHPUT (3 Gbit)

1.8 00

1.6 00

Random 8 Block Reads

18 . 00

16 . 00

5Volt A 12 V o l t A Watts

1.4 00

1.2 00

1.0 00

Amperes

0.800

0.600

0.400

0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0

14 . 00

12 . 00

10 . 00

8.00

6.00

4.00

Power (watts)

I/Os per Second

Figure 12. ST336754SS (3 Gbit) DC current and power vs. input/output operations per second

ST336754SS in 1.5 Gbit operation

Typical power dissipation under idle conditions in 1.5 Gbit operation is 10.63 watts (36.27 BTUs per hour). To obtain operating power for typical random read ope rations , refer to the following I/O rate cur ve (see Figure

8). Locate the typica l I/O rate for a drive i n your sys tem on the h orizontal axi s and read th e corres ponding + 5

volt current, +12 vol t cur r ent, and total wa tts on the v erti ca l a xis . To calculate BTUs per hour, multiply watts by

3.4123.

ST336754S S DC CURRE NT/PO WER vs THR OUGHPUT ( 1. 5 Gbit )

1.8 0 0

1.6 0 0

Random 8 Block Reads

18 . 00

16 . 00

5Volt A 12 V o l t A Watts

1.4 0 0

1.2 0 0

1.0 0 0

Amperes

0.800

0.600

0.400

0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0

Figure 13. ST336754SS (1.5 Gbit) DC current and power vs. input/output operations per second

Cheetah 15K.4 SAS Product Manual, Rev. B 33

I/Os per Second

14 . 00

12 . 00

10 . 00

8.00

6.00

4.00

Power (watts)

6.4 Environmental limits

Temperature and humidity val ues exper i enced by the drive mus t be suc h that c ond ens ation does not occur on any drive part. Altitude and atmospheric pressu re specifications are refer enced to a standard day at 58.7 °F (14.8°C). Maximum wet bulb temperature is 82°F (28°C).

6.4.1 Temperature

a. Operating

With cooling designe d to maintain the case temper atures, the dr ive meets all s pecificati ons over a 41° F to 131°F (5°C to 55°C) drive ambient temperature range with a maximum temperature gradient of 36°F (20°C) per hour. The enclosure for the drive shoul d be desig ned such that these temper atures not e xceeded. Air flow may be needed to achieve these temp erature values (see Section tures above these values may adversely affect the drives ability to meet specifications.

The AFR specification for the drive is based on operating in an environment that ensures that the case temperatures are not exceeded. Occasional excursions to drive ambient temperatures of 131°F (55°C) or 41°F (5°C) may occur without impact to spe cified AFR. A ir flow may be needed to ac hieve these tempe ratures. Continual or sustained operation at case temperatures above these value s may degrade AFR. The maxi mum allowable continuous or sustained HDA case temperature for the rated AFR is 122°F (50°C).

To confirm that the required cooling for the electr onics and HDA is provided, place the drive in its final mechanical configurati on, perform random write/read operati ons . After the temper atu res stabil iz e, meas ure the case temperature of the drive.

The maximum allowabl e HDA c ase temperature is 60°C. Op erati on of t he d riv e a t the ma xi mu m c as e t emperature is intended for short time periods only. Continuous operatio n at the elevated temperatures will reduce product reliabili ty.

b. Non-operating

–40° to 158°F (–40° to 70°C) package ambient with a maxim um 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.

8.2). Operation at case tempera-

HDA Temp. Check Point

Figure 14. Location of the HDA temperature check point

1.0"

.5"

34 Cheetah 15K.4 SAS Product Manual, Rev. B

6.4.2 Relative humidity

The values below assume that no condensation on the drive occurs. 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.

6.4.3 Effective altitude (sea level)

a. Operating

–1,000 to +10,000 feet (–305 to +3,048 meters)

b. Non-operating

–1,000 to +40,000 feet (–305 to +12,210 meters)

6.4.4 Shock and vibration

Shock and vibration lim its specifie d in this docum ent are measur ed directl y on the driv e chassis . If the drive is installed in an e nclosure to which the stated shock and/or vibra tion cri teria is ap plied, reson ances 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 vibr ation define d within this doc ument are spec ified with the d rive mounted by any of the four methods show n i n Fig ure

15, and in accordance with t he r es tri cti ons o f S ect ion 8.3. Orientation of the

side nearest the LED may be up or down.

6.4.4.1 Shock

a. Operating—normal

The drive, as installed for normal operation, shall operate error free while subjected to intermittent shock not exceeding 15 Gs at a maximum duration of 11 msec (half sinewave). The drive, as ins talled for normal operation, shall operate error free while subjected to intermittent shock not exceeding 65 Gs at a maximum duration of 2 msec (half sinewave). Shock may be applied in the X, Y, or Z axis.

b. Operating—abnormal

Equipment, as installed for norma l operation, does not inc ur physical damage while subjected to intermittent shock not exceedi ng 40 Gs at a maximum duratio n of 11 msec (half sinewave ). Shock occurring at abnormal levels may promote degraded operational performance during the abnormal shock period. Speci fied 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 two times per second.

c. Non-operating

The limits of non-operating shock shall apply to all c onditions of handl ing and transpo rtation. This inc ludes both isolated drives and integrated drives.

The drive subjected to nonrepetitive sh ock not exceeding 7 5 Gs at a maximum d uration of 11 msec (half sinewave) shall n ot exh ibit dev ice d amage or pe rformanc e deg radation . Sh ock may be ap plied in the X, Y, or Z axis.

The drive subjected to no nrepetitive shock n ot exceeding 250 Gs at a maxi mum duration of 2 msec (hal f sinewave) does not exhibi t device dam age or pe rforman ce degr adati on. Shock m ay be appl ied in th e X, Y, or Z axis.

The drive subjected to no nrepetitve shock not exc eeding 10 0 Gs at a maxim um duration of 0.5 msec (hal f sinewave) does not exhibi t device dam age or pe rforman ce degr adati on. Shock m ay be appl ied in th e X, Y, or Z axis.

Cheetah 15K.4 SAS Product Manual, Rev. B 35

d. Packaged

Disc drives shipped as loose load (no t palletized) g eneral frei ght will b e packaged to w ithstand drops f rom 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).

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)

Drives packaged in single or mul tipacks with a gross weight o f 20 pounds (8.95 k g) or less by Se agate for general freight ship ment shal l withstand a drop t est from 48 inches (1, 070 mm) aga inst a co ncrete floor or equivalent.

Y X

Figure 15. Recommended mounting

36 Cheetah 15K.4 SAS Product Manual, Rev. B

6.4.4.2 Vibration

a. Operating—normal

The drive as installed for normal ope ration, shall comply with the complete specif ied performance while subjected to continuous vibration not exceeding

5-500 Hz @ 0.5 G (zero to peak) Vibration may be applied in the X, Y, or Z axis. Operating normal translational random flat profile 10 - 400 Hz 0.4 GRMS

b. Operating—abnormal

Equipment as installed for normal operation shall not in cur physical damage while subj ected to periodic vibration not exceeding:

15 minutes of duration at major resonant frequency

5-500 Hz @ 0.75 G (X, Y, or Z axis) 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 10 - 400 Hz 1.2 GRMS

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 i ncur ph ysi cal damag e o r degrad ed per formanc e as a result of con tinuous vib ratio n not exceeding

5-22 Hz @ 0.040 inches (1.02 mm) displacement (zero to peak)

22-500 Hz @ 2.00 G (zero to peak) Vibration may be applied in the X, Y, or Z axis. Non-operating translational random flat profile 10 - 400 Hz 1.2 GRMS

6.4.5 Air cleanliness

The drive is designed to operate in a typical office environment with minimal environmental control.

6.4.6 Corrosive environment

Seagate electronic driv e components pass accelerated corr osion testing equivalent to 10 ye ars exposure to light industrial envir onments containi ng sulfuro us gases, chlorine an d nitric oxide , classes G and H per ASTM B845. However, this accelerated testing cannot duplicate every potential application environment.

Users should use cauti on exposing any ele ctronic compo nents to uncontrolled chem ical pollutants and corr osive chemicals as electronic drive component reliability can be affected by the installation environment. The silver, copper, nickel and gold films us ed in Sea gate pro ducts are espec ially sensit ive to the pres ence of sulfide , chloride, and nitrate contaminants. Sulfur is found to be the most damaging. In addition, electronic components should never be ex pose d to c ondensin g water on the surfac e of th e pri nted cir cuit bo ard a ssembly (PCBA ) or exposed to an ambient relative humidity greater than 95%. Materials used in cabinet fabrication, such as vulca nized rubber, that can outgas corr osive compoun ds should be m inimized or e liminated. Th e useful life of any electronic equipment may be extended by replacing materials near circuitry with sulfide-free alternatives.

Cheetah 15K.4 SAS Product Manual, Rev. B 37

6.4.7 Acoustics

Sound power during idle mode shall be 3.6 bels typical when measured to ISO 7779 specification. There will not be any discrete tones more than 10 dB above the masking nois e on typical drives when mea-

sured according to Sea gate specificat ion 30553-001 . There will not be any tones more than 24 dB abo ve the masking noise on any drive.

6.4.8 Electromagnetic susceptibility

See Section 2.1.1.1.

6.5 Mechanical specifications

Refer to Figure 16 for detailed physical dimensions. See Section 8.3, “Drive mounting.”

Height: 1.000 in 25.4 mm Width: 4.000 in 101.6 mm Depth: 5.75 in 146.05 mm Weight: 1.5 pounds 0.68 kilograms

50.80

(2.000)

UNITS OF MEASURE: mm (inches)

20.14 (.793)

101.60 +/- .25

(4.000 +/- .010)

2X 100.13 (2X 3.942)

(3.875)

26.11 MAX

(1.028 MAX)

98.42

33.40

(1.315)

2X 20.14 (2X .793)

1.45 (.057)

20.68 (.814)

0.76

( .030)

6.35 (.250)

3.17 (.125)

24.00 (.945)

2X 28.45

(2X 1.120)

41.15 (1.620)

2X 29.21

(2X 1.150)

2X 70.05 (2X 2.758)

2X 130.05 (2X 5.120)

85.60 (3.370)

122.00 (4.803)

146.99 MAX (5.787 MAX)

131.17 (5.164)

4.22 X 90 ( .166 X 90 )

0.36

( .014)

4.57 MIN BLIND

( .18 MIN BLIND)

4.22 X 90 ( .166 X 90 )

0.36

( .014)

DRIVE

CENTER

LINE

0.13

(.005)

0.25

(.010)

0.13

(.005)

3.50 +/- .38

(.138 +/- .015)

Figure 16. Physical dimensions

38 Cheetah 15K.4 SAS Product Manual, Rev. B

0.99

(.039)

0.41

(.016)

36.37

(1.432)

7.0 Defect and error management

The drive, as deli ve re d, c om pl ies w ith thi s pr odu ct ma nual. The read erro r rates an d s pe ci fi ed sto rage capacities are not dependent upon use of defect management routines by the host (initiator).

Defect and error managem ent in the SCSI protocol involves the drive internal defect/error m anagement and SAS system error consid erations (errors in co mmunicat ions betwee n the initiato r and the drive). Tools for use in designing a def ect/error man agement plan are briefly outl ined in this se ction. Refe rences to othe r sections are provided when necessary.

7.1 Drive internal defects/errors

During the initial drive format operation at the factor y, media defects are identified, tagged as being unusable , and their locations recorded on the dr ive 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 lo cation listed in the defects reallocat ion table. The “P” list is n ot altered after factory formatting. Locations of defects found and reallocated duri ng error recovery p rocedures after drive shipment are listed in the “G” list (d efects growth list) . The “P” and “G ” lists may be refe renced by the in itiator u sing the Read Defect Data command.

Details of the SCSI com man ds supp orted by the dr ive ar e des cribe d in t he SA S Interface Manual. Also, mor e information on the drive Error Recovery philosophy is presented in the SAS Interface Manual.

7.2 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 Par am ete rs mod e page. E rror r ecov er y and defect management may inv olv e us ing se v eral SCSI commands de scribed i n the SAS In terface M anual. The drive implem ents selectabl e error recove ry 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 addi tion to c ontr o ll ing the re co ve ry le ve l for a singl e LB A. T he total amount of time spent in error recovery for a comm and c an be li mited using the Recovery Time Limit bytes in the E rror Recov er y mod e page. The total amount of time spent in e rror recovery for a single LBA can be limited using the Re ad Retry Count or Write Retry Count bytes in the Error Recovery mode page.

The drive firmware error rec overy algo rithms con sists of 11 levels for read recoveries and five leve ls for write. Each level may consis t of multip le steps, where a step is define d as a recove ry function involv ing a si ngle reread or re-write at temp t. Th e maximum level used by t he driv e i n LBA rec ov er y i s dete rmin ed by the read and write retry counts.

Table 5 equates the re ad and write retry count with the max imum possible recovery tim e for read and write recovery of individua l LBAs . The time s give n do not inc lude time taken to pe rform realloc ations . Realloc ations are performed when the ARRE bit (for reads) or AWRE bit (for writes) is one, the RC bit is zero, and the recov ery time limit for the command has not yet been met. Time needed to perform reallocation is not counted against the recovery time limit.

Cheetah 15K.4 SAS Product Manual, Rev. B 39

When the RC bit is on e, reall ocatio ns are d isabled even i f the AR RE or AWRE bits are one. The d rive wi ll 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.

Table 5: Read and write retry count maximum recovery times

Maximum recovery time per

Read retry count

0 51.87 0 23.94 1 59.85 1 35.91 2 203.49 2 55.86 3 235.41 3 67.83 4 271.32 4 119.7 5 283.29 5 (default) 147.63 6 315.21 7 395.01 8 454.86 9 486.78 10 522.69 11 (default) 1,264.83

LBA (cumulative, msec)

Write retry count

Maximum recovery time per

LBA (cumulative, msec)

[1] Setting these retry c ounts to a val ue be low th e defa ult s etting cou ld res ult i n deg radat ion o f the unre cov-

ered error rate which may exceed the value given in this product manual. A setting of zero (0) will result in the drive not performing error recovery.

For example, suppose the read /wr ite recov ery page has the RC bit set to 0, r ead ret ry co unt s et to 4, an d the recovery time limit fi eld ( Mode S ense page 0 1, byt es 10 a nd 11) set to FF FF hex (max imum ). A f our LBA Read command is a llowed to take up to 271.32 msec recove ry time fo r eac h of the four LBA s in the command. If the reco very ti me lim it is set to 0 0 C8 hex (200 m sec dec imal) a four LB A rea d comm and is allowed to take up to 200 msec for all err or re co very with in tha t command. The use of the Recover y Time Limit field allows f iner granularity on control of the time spent in error reco very. The recov ery time limit only starts counting when the dr ive is executi ng error recove ry and it resta rts on each command . There fore, each command’s total re covery ti me is subjec t to the recov ery tim e lim it. Note : A reco very ti me li mit of 0 will use the drive’s defa ult value of FF FF. Minimum re covery time limit is achieved by setting the Recovery Time Limit field to 00 01.

7.3 SAS system errors

Information on the re porting of operational er rors or faults across the i nterface 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 de scribed in the SAS Interfac e Manu al. Status reporting plays a

role in systems e rro r manage men t and its use in that res pect is d escribed in sectio ns wh ere the v arious com mands are discussed.

40 Cheetah 15K.4 SAS Product Manual, Rev. B

8.0 Installation

Cheetah disc drive installation is a plug- and-play pr ocess. The re are no j umpers, sw itches, o r terminator s on the drive.

SAS drives are desi gned to be used in a host s ystem that provides a SAS -compatible backplane with ba ys designed to accom odate the drive. In su ch systems, the h ost system typically p rovides a carrier or tray into which you need to mount the drive. Mount the drive to the carrier or tray provided by the host system using four 6-32 UNC screws. Do not over-tighten or force the screws. You can mount the drive in any orientation.

Note. SAS drives a re designed to be attached to the host system without I/O or power cables. If you

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).

Slide the carrier or tray into the appropriate bay in your host system using the instructions provided by the host system. This connects the drive directly to your system’s SAS connector. The SAS connector is normally located on a SAS backpanel. See

Power is supplied through the SAS connector. The drive is shipped fr om the factory low-level forma tted in 512 -byte logical blocks. You need to reformat the

drive only if you want to select a different logical block size.

Section 9.4.1 for additional information about these connectors.

SAS Interface

connector

Figure 17. Physical interface

8.1 Drive orientation

The drive may be m ounted in any orientation. All dr ive performance characterizati ons, however, have been done with the drive in horizontal (discs level) and vertical (drive on its side) orientations, which are the two pre ferred mounting orientations.

Cheetah 15K.4 SAS Product Manual, Rev. B 41

8.2 Cooling

Cabinet cooling mus t be desig ned by th e customer so tha t the ambi ent tempera ture imm ediately sur roundin g the drive will not exceed temperature conditions specified in

The rack, cabinet, or drawer environment for the drive must provide heat remov al from the electronics and head and disc assem bl y (HD A). You should confirm that ade quate heat removal is pr o vided us in g th e tem per ature measurement guidelines described in Section 6.4.1.

Forced air flow may be required to keep temper atures at or below the temp eratures spe cified in Section 6.4.1 in which case the drive should be oriented, or air flow directed, so that the least amount of air flow resistance is created while providi ng air flow to the elec tronics and HDA. Al so, the shortest poss ible path between the air inlet and exit should be chos en to minimi ze the tr avel leng th of air heated by the drive and other heat sourc es within the rack, cabinet, or drawer environment.

If forced air is det er min ed to be nec es sa ry, possible air-flow patter ns a re s hown i n Fi gur e 18. The air-flow patterns are created by on e or more fans, e ither forcing or d rawing air as sh own in the illu strations. C onduction, convection, or other for ced air-flow patterns are acceptabl e as long as the temperature m easurement guide lines of Section 6.4.1 are met.

Section 6.4.1, "Temperature."

Note. Air flows in the direction shown (back to front) or in reverse direction (front to back)

Note. Air flows in the direction shown or in reverse direction (side to side)

Figure 18. Air flow

Above unit

Under unit

Above unit

Under unit

42 Cheetah 15K.4 SAS Product Manual, Rev. B

8.3 Drive mounting

Mount the drive using the bottom or side mounting holes. If you mount the drive using the bottom holes, ensure that you do not physically distort the drive 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:

K x X = F < 15lb = 67N

where K is the mounting s urface stiffness (units in lb/i n or N/mm) and X is the out-of-plane surfac e distortion (units in inches or millimeters ). The out-of- plane distor tion (X) is determine d by defin ing a plane w ith three o f the four mounting po ints fixed and evaluat ing the out-of-plan e deflection of the fo urth mounting poi nt when a known force (F) is applied to the fourth point.

8.4 Grounding

Signal ground (PCB A) and HDA ground a re connected to gether in the drive an d cannot be separate d by the user. The equipment in which the drive is mou nte d is co nne cte d dire ct ly to the HD A an d P CBA with no el ec tri cally isolating s hock mounts. If it is desired for the sy stem chassis to not be connected t o the HDA/PCBA ground, the systems in tegrator or user must provide a noncond uctive (elec trically is olating) m ethod of mou nt ing the drive in the host equipment.

Increased radiated em issions may res ult if you do not provid e the maximum su rface area ground conn ection between system ground and drive ground. This is the system designer’s and integrator’s responsibility.

Cheetah 15K.4 SAS Product Manual, Rev. B 43

44 Cheetah 15K.4 SAS Product Manual, Rev. B

9.0 Interface requirements

This section partially describes the interface requirements as implemented on Cheetah drives. Additional information is provided in the SAS Interface Manual (part number 100293071).

9.1 SAS features

This section lists the SAS-specific features supported by Cheetah drives.

9.1.1 task management functions

Table 6 lists the SAS task management functions supported.

Table 6: SAS task management functions supported

Ta sk nam e Supported

Abort Task Yes Clear ACA Yes Clear task s et Yes Abort task set Yes Logical Unit Reset Yes Query Task Yes

9.1.2 task management respons es

Table 7 lists the SAS response codes returned for task management functions supported.

Table 7: 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

Cheetah 15K.4 SAS Product Manual, Rev. B 45

9.2 Dual port support

Cheetah 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 run at the same link ra te. The first po rt to successfu lly complet e speed ne gotiation sets the li nk rate support by both ports. When the second port participates in sp eed negotiatio n, it indicates the only sup ported speed is the s peed sele cted by the fi rst por t. If the fi rst port to compl ete spe ed nego tiatio n loos es sync before the second port completes speed negotiation, both ports revert back to the power on condition of allow ing either link rate (1.5 or 3.0 Gbits/sec).

Subject to buffer availability, the Cheetah drives support:

• Concurrent port tr ansfers—The dr ive suppor ts receiving COM MAND, TASK management transf ers 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.

46 Cheetah 15K.4 SAS Product Manual, Rev. B

9.3 SCSI commands supported

Table 8 lists the SCSI commands supported by Cheetah drives.

Table 8: Commands supported by Cheetah 15K.4 SAS family drives

Command name Command code Supported

Change Definition 40h N Compare 39h N Copy 18h N Copy and Verify 3Ah N Format Unit [1] 04h Y DPRY bit supported N DCRT bit supported Y STPF bit supported Y IP bit supported Y DSP bit supported Y IMMED bit supported Y VS (vendor specific) N Inquiry 12h Y Date Code page (C1h) Y Device Behavior page (C3h) Y Firmware Numb er s page (C0h) Y Implemented Operating Def page (81h) Y Jumper Settings page (C2h) 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) Y Buffer Over-run/Under -run page (01h) N Cache Statistics page (37h) Y Factory Log page (3Eh) Y Last n Deferred Errors or Asynchronous Events page (0Bh) N Last n Error Events page (07h) N

Cheetah 15K.4 SAS Product Manual, Rev. B 47

Table 8: Commands supported by Cheetah 15K.4 SAS family drives (continued)

Command name Command code Supported

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 Recover y pag e (0 1 h) Y Format page (03h) Y Information Exceptions Control page (1Ch) Y Notch and Partition Page (0Ch) N Protocol-Specific Port page (19h) Y Power Conditi on page (1Ah ) Y Rigid Disc 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 Prefetch 34h N Read 08h Y Read Buffer (modes 0, 2, 3, Ah and Bh supported) 3Ch Y Read Capacity 25h Y Read Defect Data (10) 37h Y Read Defect Data (12) B7h Y Read Extended 28h Y DPO bit supported Y FUA bit supported Y Read Long 3Eh Y Reassign Blocks 07h Y Receive Diagnostic Results 1Ch Y

48 Cheetah 15K.4 SAS Product Manual, Rev. B

Table 8: Commands supported by Cheetah 15K.4 SAS family drives (continued)

Command name Command code Supported

Supported Diagnostics pages (00h) Y Translate page (40h) Y Release 17h Y Release (10) 57h 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 Search Data Equal 31h N Search Data High 30h N Search Data Low 32h N Seek 0Bh Y Seek Extended 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 Test Unit Ready 00h Y Verify 2Fh Y BYTCHK bit Y Write 0Ah Y Write and Verify 2Eh Y DPO bit Y Write Buffer (modes 0, 2, supported) 3Bh Y Firmware Download option

(modes 5, 7, Ah and Bh supported) [3] Write Extended 2Ah Y DPO bit Y FUA bit Y Write Long 3Fh Y

Cheetah 15K.4 SAS Product Manual, Rev. B 49

Table 8: Commands supported by Cheetah 15K.4 SAS family drives (continued)

Command name Command code Supported

Write Same 41h Y PBdata N LBdata N XDRead 52h N XDWrite 50h N XPWrite 51h N

[1] Cheetah drives can format to any multiple of four bytes per logical block in the range 512 to 704 bytes. [2] Warning. Power loss during flash programming can r es ult i n fir mwa re c orr upti on . Thi s us ually m ak es th e

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.

50 Cheetah 15K.4 SAS Product Manual, Rev. B

9.3.1 Inquiry data

Table 9 lists the Inquiry command data that the dri ve should return to the initiator per the form at given in the SAS Interface Manual.

Table 9: Cheetah 15K.4 SAS inquiry data

Bytes Data (hex)

0-15 00 00 03** 12 8B 00 10 0A 53 45 41 47 41 54 45 20 Vendor ID 16-31 [53 54 33 37 33 34 35 34 53 53 20]120 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* 30* 34* 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

* Copyright year (changes with actual year). ** 02 = SCSI-2 implemented with some SCSI-3 features (default).

03 = SCSI-3 implemented.

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 18 through 26 reflect model of drive. The table above shows the hex values for Model ST373454SS.

Refer to the values below for the values of bytes 18 through 27 of you particular model:

ST3146854SS 5354333134363835345353

ST373454SS 53 54 33 37 33 34 35 34 53 53 20

ST336754SS 53 54 33 33 36 37 35 34 53 53 20

9.3.2 Mode Sense data

The Mode Sense command pr ovide s a way for the driv e to report its operati ng paramete rs to the initi ator. The drive maintains four sets of mode parameters:

1. Default values

Default values are har d-coded in the drive firmwa re stored in fl ash E-PROM (non volatile me mory) on the drive’s PCB. These defa ult values can be changed o nly by downloadi ng a complete s et of new firmw are into the flash E-PROM. An ini tiator can requ est and rece ive from the driv e a list of default values and use those in a Mode Select co mmand to set up new current and s aved values , where the val ues are chan ge able.

2. Saved values

Saved values are st ored on the dr ive’s media us ing a Mode Selec t comman d. Only parameter va lue s 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 command 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 memo ry. It is not possible to change the current val ues (or the saved va lues) with a Mode

Cheetah 15K.4 SAS Product Manual, Rev. B 51

Select command before the drive achieves operating speed and is “ready.” An attempt to do so results in a “Check Condition” status.

On drives requiring unique sa ved value s, the req uired unique saved value s are sto red into the saved va lues storage location on the medi a pr i or to sh ip ping the drive. Some drives m ay hav e uni qu e firm war e wit h 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. Curr ent va lue s 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 identifi ed as chan geable va lues. Ori ginally, current values a re 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) i ndicates the value can be changed. A zero (0) indicates the value is not changeable. For example, in Table

9.3.2.1, refer to Mode page 81, in the row entitled “CHG.” These are hex numbers representing the ch angeable v alues for Mode page 81. Note in colu mns 5 and 6 (by tes 0 4 and 05), ther e is 00h which in dicat es tha t in byte s 04 an d 05 none of the bits are changeable. Note al so 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 i n the fi eld, it mea ns that bi t is no t chan geable . Sinc e all of th e bits in byte 02 are o nes, all of these bits are changeable.

The changeable values list can only be changed by downloading new firmware into the flash E-PROM.

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.

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 ).

Definitions: DEF = Default value. Standard OEM drives are shipped configured this way. CHG = Changeable bits; indicates if default value is changeable.

52 Cheetah 15K.4 SAS Product Manual, Rev. B

9.3.2.1 ST3146854SS Mode Sense data

DEF Page 0(0x00), 00 00 0F 00 00 00 CHG Page 0(0x00), B7 40 0F 00 00 00

DEF Page 1(0x01), C0 0B FF 00 00 00 05 00 FF FF CHG Page 1(0x01), FF FF 00 00 00 00 FF 00 FF FF

DEF Page 2(0x02), 00 00 00 00 00 00 00 00 00 A1 00 00 00 00 CHG Page 2(0x02), 00 00 00 00 00 00 00 00 FF FF 00 00 00 00

DEF Page 3(0x03), 56 20 00 00 00 30 00 00 02 C2 02 00 00 01 00 AA 00 91 40 00 00 00 CHG Page 3(0x03), 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

DEF Page 4(0x04), 00 C6 88 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3A A7 00 00 CHG Page 4(0x04), 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

DEF Page 7(0x07), 00 0B FF 00 00 00 00 00 FF FF CHG Page 7(0x07), 0F FF 00 00 00 00 00 00 FF FF

DEF Page 8(0x08), 14 00 FF FF 00 00 FF FF FF FF 80 20 00 00 00 00 00 00 CHG Page 8(0x08), B5 00 00 00 FF FF FF FF 00 00 A0 FF 00 00 00 00 00 00

DEF Page 10(0x0A), 02 00 00 00 00 00 00 00 08 4D CHG Page 10(0x0A), 03 F1 00 00 00 00 00 00 00 00

DEF Page 25(0x19), 06 00 07 D0 00 00 CHG Page 25(0x19), 10 00 FF FF FF FF

DEF Page 26(0x1A), 00 02 00 00 00 05 00 00 00 04 CHG Page 26(0x1A), 00 03 FF FF FF FF 00 00 00 00

DEF Page 28(0x1C), 10 00 00 00 00 00 00 00 00 01 CHG Page 28(0x1C), 9D 0F FF FF FF FF FF FF FF FF

DEF Page 53(0x35), 01 00 00 00 01 00 00 0F 00 00 CHG Page 53(0x35), 03 00 00 00 03 00 FF FF 00 00

DEF Page 57(0x39), 00 0C 00 00 00 00 00 00 00 00 CHG Page 57(0x39), 00 0C 00 00 00 00 00 00 00 00

DEF Page 58(0x3A), 00 00 00 18 00 18 50 00 00 00 CHG Page 58(0x3A), 00 00 FF FF FF FF 00 00 00 00

Cheetah 15K.4 SAS Product Manual, Rev. B 53

9.3.2.2 ST373454SS Mode Sense data

DEF Page 0(0x00), 00 00 0F 00 00 00 CHG Page 0(0x00), B7 40 0F 00 00 00

DEF Page 1(0x01), C0 0B FF 00 00 00 05 00 FF FF CHG Page 1(0x01), FF FF 00 00 00 00 FF 00 FF FF

DEF Page 2(0x02), 00 00 00 00 00 00 00 00 00 A1 00 00 00 00 CHG Page 2(0x02), 00 00 00 00 00 00 00 00 FF FF 00 00 00 00

DEF Page 3(0x03), 2B 10 00 00 00 18 00 00 02 C2 02 00 00 01 00 AA 00 91 40 00 00 00 CHG Page 3(0x03), 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

DEF Page 4(0x04), 00 C6 88 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3A A7 00 00 CHG Page 4(0x04), 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

DEF Page 7(0x07), 00 0B FF 00 00 00 00 00 FF FF CHG Page 7(0x07), 0F FF 00 00 00 00 00 00 FF FF

DEF Page 8(0x08), 14 00 FF FF 00 00 FF FF FF FF 80 20 00 00 00 00 00 00 CHG Page 8(0x08), B5 00 00 00 FF FF FF FF 00 00 A0 FF 00 00 00 00 00 00

DEF Page 10(0x0A), 02 00 00 00 00 00 00 00 04 7E CHG Page 10(0x0A), 03 F1 00 00 00 00 00 00 00 00

DEF Page 25(0x19), 06 00 07 D0 00 00 CHG Page 25(0x19), 10 00 FF FF FF FF

DEF Page 26(0x1A), 00 02 00 00 00 05 00 00 00 04 CHG Page 26(0x1A), 00 03 FF FF FF FF 00 00 00 00

DEF Page 28(0x1C), 10 00 00 00 00 00 00 00 00 01 CHG Page 28(0x1C), 9D 0F FF FF FF FF FF FF FF FF

DEF Page 53(0x35), 01 00 00 00 01 00 00 0F 00 00 CHG Page 53(0x35), 03 00 00 00 03 00 FF FF 00 00

DEF Page 57(0x39), 00 0C 00 00 00 00 00 00 00 00 CHG Page 57(0x39), 00 0C 00 00 00 00 00 00 00 00

DEF Page 58(0x3A), 00 00 00 18 00 18 50 00 00 00 CHG Page 58(0x3A), 00 00 FF FF FF FF 00 00 00 00

54 Cheetah 15K.4 SAS Product Manual, Rev. B

9.3.2.3 ST336754SS Mode Sense data

DEF Page 0(0x00), 00 00 0F 00 00 00 CHG Page 0(0x00), B7 40 0F 00 00 00

DEF Page 1(0x01), C0 0B FF 00 00 00 05 00 FF FF CHG Page 1(0x01), FF FF 00 00 00 00 FF 00 FF FF

DEF Page 2(0x02), 00 00 00 00 00 00 00 00 00 A1 00 00 00 00 CHG Page 2(0x02), 00 00 00 00 00 00 00 00 FF FF 00 00 00 00

DEF Page 3(0x03), 15 88 00 00 00 0C 00 00 02 C2 02 00 00 01 00 F0 00 91 40 00 00 00 CHG Page 3(0x03), 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

DEF Page 4(0x04), 00 C6 88 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3A A7 00 00 CHG Page 4(0x04), 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

DEF Page 7(0x07), 00 0B FF 00 00 00 00 00 FF FF CHG Page 7(0x07), 0F FF 00 00 00 00 00 00 FF FF

DEF Page 8(0x08), 14 00 FF FF 00 00 FF FF FF FF 80 20 00 00 00 00 00 00 CHG Page 8(0x08), B5 00 00 00 FF FF FF FF 00 00 A0 FF 00 00 00 00 00 00

DEF Page 10(0x0A), 02 00 00 00 00 00 00 00 02 5B CHG Page 10(0x0A), 03 F1 00 00 00 00 00 00 00 00

DEF Page 25(0x19), 06 00 07 D0 00 00 CHG Page 25(0x19), 10 00 FF FF FF FF

DEF Page 26(0x1A), 00 02 00 00 00 05 00 00 00 04 CHG Page 26(0x1A), 00 03 FF FF FF FF 00 00 00 00

DEF Page 28(0x1C), 10 00 00 00 00 00 00 00 00 01 CHG Page 28(0x1C), 9D 0F FF FF FF FF FF FF FF FF

DEF Page 53(0x35), 01 00 00 00 01 00 00 0F 00 00 CHG Page 53(0x35), 03 00 00 00 03 00 FF FF 00 00

DEF Page 57(0x39), 00 0C 00 00 00 00 00 00 00 00 CHG Page 57(0x39), 00 0C 00 00 00 00 00 00 00 00

DEF Page 58(0x3A), 00 00 00 18 00 18 50 00 00 00 CHG Page 58(0x3A), 00 00 FF FF FF FF 00 00 00 00

Cheetah 15K.4 SAS Product Manual, Rev. B 55

9.4 Miscellaneous operating features and conditions

Table 10 lists variou s features and con dit ions. A “Y” in the support c olumn i ndica tes the fea ture or co nditio n is supported. An “N” in the support column indicates the feature or condition is not supported.

Table 10: Miscellaneous features

Supported Feature or condition

N Automatic contingent allegiance N Asynchronous event notification N Synchronized (locked) spind le ope rati on 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 11: Miscellaneous status

Supported Status

Y Good Y Check condition Y Condition met/good Y Busy Y Intermediate/good Y Intermediate/condition met/good Y Reservation conflict Y Task set full N ACA active N ACA active, faulted initiator

56 Cheetah 15K.4 SAS Product Manual, Rev. B

9.4.1 SAS physical interface

Figure 19 shows the location of the SAS device connector J1. Figures 20 and 21 provide the dimensions of the SAS device.

Details of the physical, el ectrical, and logica l characteristics are p rovided within this se ction. The operati onal aspects of Seagate’s SAS drives are provided in the SAS Interface Manual..

SAS Interface

connector

Figure 19. Physical interface

Cheetah 15K.4 SAS Product Manual, Rev. B 57

0.80 (6X)

0.30 0.05 (2X)

4.00 0.08

0.15 D

2.00 (3X)

7.625.92

5.08

42.73 REF.

41.13 0.15

0.20 B

4.65

0.52 0.08 x 45

0.45 0.03 (7X)

0.10 M E

1.10

C OF DATUM D

0.30 0.05 (4X)

0.35MIN

15.875

1.27 (14X)

P15

Figure 20. SAS connector dimensions

33.43 0.05

5.08

C OF DATUM B

15.875

1.27 (6X)

R0.30 0.08 (4X)

SEE Detail1

0.84 0.05 (22X)

0.15 B

4.90 0.08

58 Cheetah 15K.4 SAS Product Manual, Rev. B

Detail A

SEE Detail 2

3.90 0.15

2.25 0.05

4.85 0.05

0.10 B

SECTION A - A

0.08 0.05

S14

6.10

4.40 0.15

0.35 0.05

CONTACT SURFACE FLUSH TO DATUM A 0.03

0.40 0.05 X 45 (3X)

CORING ALLOWED IN THIS AREA.

0.30 0.05 x 45 (5X)

R0.30 0.08

SECTION C - C

1.95 0.08

1.23 0.05

Detail 2

0.08 0.05

2.40 0.08

0.10 A SECTION B - B

1.90 0.08

Figure 21. SAS connector dimensions

9.4.2 Physical characteristics

This section defines physical interface connector.

9.4.3 Connector requirements

Contact your preferred conn ector manu facturer for mating part in formation . Part numb ers for SAS connectors will be provided in a fu ture rev ision of th is pub lica tion when produ ction parts are availabl e from maj or co nnec tor manufacturers.

The SAS device connector is illustrated i n Figures 20 and 21.

Cheetah 15K.4 SAS Product Manual, Rev. B 59

9.4.4 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.

9.4.5 Pin descriptions

This section provides a pin-out of the SAS device and a description of the functions provided by the pins.

Table 12: SAS pin descriptions

Pin Signal name Signal type Pin Signa l name Signal type

S1 Port A Ground P1* NC (reserved 3.3Volts) S2* +Port A_in Diff. input pa ir P2* NC (reserved 3.3Volts) S3* -Port A_in P3 NC (reserved 3.3Volts) 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 pa ir 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

* - Short pin to support hot plugging NC - No connection in the drive.

60 Cheetah 15K.4 SAS Product Manual, Rev. B

9.4.6 SAS transmitters and receivers

A typical SAS differential copper tran smitt er and recei ver pair is sho wn in Fig ure 22. The receiver i s AC coupling to eliminate ground shift noise.

Transmitter

Figure 22. SAS transmitters and receivers

Differential

Transfer Medium

.01

Receiver

100100

9.4.7 Power

The drive receives power (+5 volts and +12 volts) through the SAS device connector. Three +12 volt pi ns provide power to the drive, 2 shor t and 1 long. The c urrent 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 a nd 1 lo ng. The current return for the +5 volt power s upply 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 throu gh the long po wer pins may be l imited by the s ystem to red uce inrush current to th e drive during hot plugging.

9.5 Signal characteristics

This section descri bes the elec tric al si gna l c harac te ri st ic s of the dr iv e’s input a nd output signals. See Ta ble 12 for signal type and signal name information.

9.5.1 Ready LED Out

The Ready LED Out signal is driven by the drive as indicated in Table 13.

Table 13: Ready LED Out conditions

Normal command activity LED status

Ready LED Meaning bit mode page 19h

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

0 1

Cheetah 15K.4 SAS Product Manual, Rev. B 61

The Ready LED Out signal i s designed to pull down the cathode of an LED. T he anode is attached to the proper +3.3 volt supply through an appropr i ate cu rren t li mi tin g r esis tor. The LED and the current limiting resi s tor are external to the drive. See Table 14 for the output characteristics of the LED drive signals.

Table 14: LED drive signal

State Test condition Output voltage

LED off, high 0 V ≤ VOH ≤ 3.6 V -100 µA < IOH < 100 µA LED o

n, l

ow IOL = 15 mA 0 ≤ VOL ≤ 0.225 V

9.5.2 Differential signals

The drive SAS differential signals comply with the intra-enclosure (internal connector) requirements of the SAS standard.

Table 15 defines the general interface characteristics.

Table 15: General interface characteristics

Characteristic Units 1.5 Gbps 3.0 Gbps

Bit rate (nominal) Mbaud 1,500 3,000 Unit interval (UI)(nominal) ps 666.6 333.3 Impedance (nominal, differential ) ohm 100 100 Transmitter transients, maximum V ± 1.2 ± 1.2 Receiver transients, maximum V ± 1.2 ± 1.2

9.5.2.1 Eye masks

9.5.2.1.1 Eye masks overview

The eye masks are g raphical representations of t he voltage and time limits on the s ignal at the compliance point. The time value s b etwe en X 1 a nd (1 - X 1) c ov er al l bu t 10

-12

of the jitter populati on. T he ran dom content

of the total jitter population has a range of ± 7 standard deviations.

62 Cheetah 15K.4 SAS Product Manual, Rev. B

9.5.2.1.2 Receive eye mask

Figure 23 describes the r eceive eye mas k. This eye mask appli es to j itter after the applicati on of a s ingle pole high-pass frequency-weigh t in g fun ction that p ro gr essi vely att enu ates ji tte r a t 20 d B/d ecade b el ow a fr eq uen cy of ((bit rate) / 1.667).

Absolute

amplitude

(in V)

Z2 Z1

0 V

-Z1

-Z2

X1X2

N ormalized time (in U I)

Figure 23. Receive eye mask

1-X1

1-X2

Verifying compliance with the limits represented by the receive eye mask should be done with reverse channel traffic present in order that the effects of crosstalk are taken into account.

9.5.2.1.3 Jitter toleran c e masks

Figure 24 describes the recei ve tole rance eye masks a nd is con structed u sing the X2 and Z2 values given i n table 18. X1OP is half the value for total jitter intable 18 and X1

is half the value for total jitter in table 19, for

TOL

jitter frequencies above ((bit rate) / 1.667).

Absolute

amplitude

(in V)

TOL

0 V

-Z1

TOL

-Z1

-Z2

TOL

Normalized ti me (in UI)

(additional sinusoidal jitter) / 2

1-X1

TOL

Outline of eye mask

before adding

sinusoidal jitter

Outline of eye mask

after adding

sinusoidal jitter

Figure 24. Reveive tolerance eye mask

Cheetah 15K.4 SAS Product Manual, Rev. B 63

The leading and tr ailing edge slopes of figure 23 shall be pres erved. As a result the ampli tude value of Z1 is less than that giv en in table 1 7 a nd Z1

and Z1OP shall be defined fr om thos e sl ope s by the following equa-

TOL

tion:

TOL

Z1OPx

---------------------------------------------------------------------------------------------------------------------------------- -=

05,()xadditional sinusoidal jitter()– X1

–

where: Z1

is the value for Z1 to be used for the tolerance masks; and

TOL

Z1OP, X1OP, and X2OP are the values in table 17 for Z1, X1, and X2. The X1 points in the recei ve toleran ce mask s are gr eater than the X1 points in t he rece ive mask s, due to the

addition of sinusoidal jitter. Figure 25 defines the sinusoidal jitter mask.

Pe ak-to-

peak

sinusoidal

jitter

(in UI)

1.5

1.0

Si nusoidal j i tter frequency

(log/log plot)

= 1.5 x 109 for 1.5 Gbps

NOM

= 3.0 x 109 for 3.0 Gbps

NOM

0.1 0

/ 25,000 F

NOM

Frequency (in kHz)

Figure 25. Sinusoidal jitter mask

NOM

/ 1,667

64 Cheetah 15K.4 SAS Product Manual, Rev. B

9.5.2.2 Transmitter signal characteristics

Table 16 specifies the signal requirem ents at the transmitter end of a TxRx con nection as measur ed into the zero-length test load. All specifications are based on differential measurements.

The OOB sequence is per formed at si gnal voltage le vels corr esponding to th e lowest supported tran sfer rate. Table 16 specifies the signal characteristics.

T able 16: Transmitter signal characteristics

Signal characteristic

Skew Tx Off Voltage Maximum rise/fall time Minimum ri se/fall time Maximum transmitter output imbalance OOB offset delta OOB common mode delta

a All tests in this table shall be performed with zero-length test load shown in figure 27. b The skew measurement shall be made at the mid point of the tran sition wi th a repeating 01 01b patte rn on the physic al

link. The same stable trigger, coherent to the data stream, shall be used for both the Tx+ and Tx- signals. Skew is defined as the time difference between the m ean s of th e m idpoint crossing times of the Tx+ signal and the Tx- signa l.

c The transmitter off voltage is the maximum A.C. voltage measured at compliance points when the transmitter is

unpowered or transmitting D.C. idle (e.g., during idle time of an OOB signal). d Rise/fall times are measured from 20 % to 80 % of the transition with a repeating 0101b pattern on the physical link. e The maximum difference between the V+ and V- A.C. RMS transmitter amplitudes measured on a CJTPAT test

pattern (see 9.5.2.3.3) into the test load shown in figure 27, as a percentage of the average of the V+ and V- A.C.

RMS amplitudes. f The maximum diff eren ce in the average differential vol t ag e (D .C. offset) component between the burs t tim es and the

idle times of an OOB signal. g The maximum difference in the average of the common mode voltage between the burst times and the idle times of

an OOB signal.

Units 1.5 Gbps 3.0 Gbps

ps 20 15

mV(P-P) < 50 < 50 ps 273 137 ps 67 67 % 10 10 mV ± 25 ± 25 mV ± 50 ± 50

Cheetah 15K.4 SAS Product Manual, Rev. B 65

9.5.2.3 Receiver signal characteristics

Table 17 defines the complia nce point requ irements of the signal at the recei ver end of a TxRx connection as measured into the test loads specified in figure 26 and figure 27.

Table 17: Receiver sign al characteristics

Signal characteristic Units 1.5 Gbps 3.0 Gbps

Jitter (see figure 23)

N/A See table 18 See table 18 2 x Z2 mV(P-P) 1,200 1,600 2 x Z1 mV(P-P) 325 275

UI 0.275 0.275 X2 UI 0.50 0.50

Skew

ps 80 75 Max voltage (non-op) mV(P-P) 2.000 2.000 Minimum OOB ALIGN burst amplitude Maximum noise during OOB idle time Max near-end crosstalk

a The value for X1 shall be half the va lue given for total jitte r in table 18. The test or an aly si s sh all include the effect s o f

a single pole high-pass frequency-weighting function that progressively attenuates jitter at 20 dB/decade below a frequency of ((bit rate) / 1,667).

b The value for X1 applies at a total jitter probability of 10

between the mask and actual signals is not a valid method for determining compliance with the jitter output

requirements. c With a measurement bandwidth of 1.5 times the baud rate (i.e. 4.5 GHz for 3.0 Gbps). d The skew measurement shall be made at the mid point of the trans ition with a repe ating 0101b p attern on the physical

link. The same stable trigger, coherent to the data stream, shall be used for both the Rx+ and Rx- signals. Skew is

defined as the tim e dif feren ce between t he mea ns of th e mid poi nt cros sing t imes of the R x+ si gnal a nd the R x- si gnal. e Near-end crosstalk is the unwan t ed s ign al am pli tud e a t rec ei ve r term in al s D R, C R, an d XR c ou ple d from signals and

noise sources other than the desired signal. Refer to SFF-8410.

mV(P-P) 240 240 mV(P-P) 120 120 mV(P-P) 100 100

-12

. At this level of probability direct visual comparison

9.5.2.3.1 Jitter

Table 18 defines the maximum allowable jitter .

Table 18: Maximum allowable jitter

1.5 Gbps m,

Deterministic jitter

0.35 0.55 0.35 0.55

a Units are in UI. b The values for jitter in this section are measured at the average amplitude point. c Total jitter is the sum of dete rmi nis tic ji tter a nd ran do m ji tter. If the actual dete rmi ni sti c ji tter i s le ss tha n the maxim um

specified, then the ran dom jitt er may increase as long as the total ji tter does not ex ce ed th e specified maximum total

jitter. d Total jitter is specified at a probability of 10 e The deterministic and total values in this table apply to jitter after application of a single pole high-pass frequency-

weighting function that progressively attenuates jitter at 20 dB/decade below a frequency of ((bit rate) / 1 667). f If total jitter received at any point is less th an the maximum allowed, the n the jitter dis tribution of th e signals is allowed

to be asymmetric. The total jitter plus the magnitude of the asymmetry shall not exceed the allowed maximum total

jitter. The numerical difference between the average of the peaks with a BER < 10

individual events is the measure of the asymmetry. Jitter peak-to-peak measured < (maximum total jitter -

|Asymmetry|).

Total jitterc,d,e,f Deterministic jittere Total jitterc,d,e,f

-12

3.0 Gbps m,

-12

and the average of the

66 Cheetah 15K.4 SAS Product Manual, Rev. B

9.5.2.3.2 Receiver jitter tolerance

Table 19 defines the amount of jitter the receiver shall tolerate .

Table 19: Receiver jitter tolerance

jitter

e,f,h

Total

jitter

Sinusoidal

b,d

jitter

-12

. Receivers shall tolerate sinusoidal jitter of

-12

. The additional 0.1 UI of sinusoidal jitter is

3.0 Gbps

Deterministic

1.5 Gbps

Sinusoidal

b,c

jitter

0.10 0.35 0.65 0.10 0.35 0.65

a Units are in UI. b The jitter values given are normative for a combination of deterministic jitter, random jitter, and sinusoidal jitter that

receivers shall be able to tolerate without exceeding a BER of 10 progressively greater amplitude at lower frequencies, according to the mask in figure 25 with the same deterministic

jitter and random jitter levels as were used in the high frequency sweep. c Sinusoidal swept frequency: 900 kHz to > 5 MHz. d Sinusoidal swept frequency: 1.800 kHz to > 5 MHz. e No value is given for random jitter. For compliance with this standard, the actual random jitter amplitude shall be the

value that brings total jitter to the stated value at a probability of 10

added to ensure the receiver has sufficient operating margin in the presence of external interference. f Deterministic jitter: 900 kHz to 750 MHz. g Deterministic jitter: 1.800 kHz to 1.500 MHz. h The deterministic and total values in this table apply to jitter after application of a single pole high-pass frequency-

weighting function that progressively attenuates jitter at 20 dB/decade below a frequency of ((bit rate) / 1.667).

Deterministic

jitter

e,g,h

Total

jitter

9.5.2.3.3 Compliant jitter test pattern (CJTPAT)

The CJTPAT within a compliant pro tocol frame is used f or all jitte r testing unl ess othe rwise spec ified. Se e the SAS Interface Manual for def inition of the requ ired pattern on the phys ical link and information re garding spe cial considerations for scrambling and running disparity.

9.5.2.3.4 Impedance specifications

Table 20 defines impedance requirements.

Table 20: Impedance requirements (Sheet 1 of 2)

Requirement Units 1.5 Gbps 3.0 Gbps

Time domain reflectometer rise time 20 % to 80 %

a,b

ps 100 50 Media (PCB or cable) Differential impedance Differential impedance imbalance Common mode impedance

b,c,d

b,c,d,g

ohm 100 ± 10 100 ± 10

ohm 5 5

ohm 32.5 ± 7.5 32.5 ± 7.5 Mated connectors Differential impedance Differential impedance imbalance Common mode impedance

b,c,d

b,c,d,g

ohm 100 ± 15 100 ± 15

ohm 5 5

ohm 32.5 ± 7.5 32.5 ± 7.5 Receiver termination Differential impedance Differential impedance imbalance Receiver termination time constant

b,e,f

b,e,f,g

b,e,f

ohm 100 ± 15 100 ± 15

ohm 5 5

ps 150 max 100 max

Cheetah 15K.4 SAS Product Manual, Rev. B 67

Table 20: Impedance requirements (Sheet 2 of 2)

receiver termination time constant

Requirement Un its 1.5 Gbps 3.0 Gbps

Common mode impedance

b,e

ohm 20 min/40 max 20 min/40 max Transmitter source termination Differential impedance Differential impedance imbalance Common mode impedance

a All times indicated for time domain reflectometer measurements are recorded times. Recorded times are twice the

transit time of the time domain reflectometer signal. b All measurements are made through mated connector pairs. c The media impedance measurement identifies the impedance mismatches present in the media when terminated in

its characteristic impedance. This measurement excludes mated connectors at both ends of the media, when

present, but includ es any interm ediate con nectors or s plices. The mated conn ectors me asurement ap plies onl y to the

mated connector pair at each end, as applicable. d Where the media has an electrical length of > 4 ns the procedure detailed in SFF-8410, or an equivalent procedure,

shall be used to determine the impedance. e The receiver termination impedance specification applies to all receivers in a TxRx connection and covers all time

points between the connector nearest the receiver, the receiver, and the transmission line terminator. This

measurement shall be made from that connector. f At the time point corresponding to th e con ne cti on of the rec eiv er to th e trans m is sio n li ne the inpu t ca p ac it a nc e of the

receiver and its connection to the transmission line may cause the measured impedance to fall below the minimum

impedances specified in this table. The area of the impedance dip (amplitude as ρ, the reflection coefficient, and

duration in time) caused by this capacitance is the receiver termination time constant. The receiver time constant

shall not be greater than the values shown in this table. An approximate value for the receiver termination time

constant is giv en b y t he p r od uct of the amplitude of the dip (as ρ) and its width (in p s) measured at the half amplitude

point. The ampli tude i s de fined as be ing th e dif fere nce i n the refl ection coef fic ient between the re flecti on co ef ficien t at

the nominal impedance and the reflection coefficient at the minimum impedance point. The value of the receiver

excess input capacitance is given by the following equation:

b,g

ohm 60 min/115 max 60 min/115 max ohm 5 5 ohm 15 min/40 max 15 min/40 max

--------------------------------------------------------------------------------- -=

R0 RR

()

where (R0 || RR) is the parallel combination of the transmission line characteristic impedance and

termination resistance at the receiver.

g The difference in measured im pe dan ce to g round on the plus and minus term in als on the in terc on nec t, t r ans mi tte r or

receiver, with a differential test signal applied to those terminals.

9.5.2.4 Electrical TxRx connections

TxRx connections may be divided into TxRx connection segments. In a single TxRx connection individual TxRx connection segme nts may be for med from di fferin g me dia and m ate ri al s, inc lu din g tr aces on p ri nte d wir ing boards and optic al fiber s. This su bclause ap plies onl y to TxRx co nnection segments that are form ed from electrically conducti ve media .

Each electrical TxRx co nnection segment shall comply with the impedance requirements of table 20 for the media from which they are formed. An equalizer network, if present, shall be part of the TxRx connection.

TxRx connections that are composed entirely of electrically conducting media shall be applied only to homogenous ground applicati ons (e.g., betwe en devi ces withi n an encl osur e or rack, or between enclo sures in tercon nected by a common ground return or ground plane).

9.5.2.4.1 Transmitter characteristics

The drive are D.C. coupled.

68 Cheetah 15K.4 SAS Product Manual, Rev. B

A combination of a zero-length test load and the transmitter compliance transfer function (TCTF) test load

6–

10–

20–

6–

10–

20–

methodology is us ed for the spe cification of transmitte r characterist ics. This m ethodology spe cifies the trans mitter signal at the tes t points on the requir ed test loads. The tra nsmitter uses the same settings (e.g., preemphasis, voltage swing ) with both the ze ro -len gth te st load and the TCTF tes t l oad . T he si gnal s pecifications at IR are met under each of these loading conditions.

The TCTF is the mathematical statement of the transfer function through which the transmitter shall be capable of producing acce ptable signals as defined by a recei ve mask. The tra nsmission magnitud e response of th e TCTF in dB is given by the following equation for 1.5 Gbps:

for 50 MHz < f < 1.5 GHz, and:

20–log10e() 65, 10

××()20, 10

f××()33, 10

f2××()++()× dB×=

for 1.5 GHz < f < 5.0 GHz, where:

a) f is the signal frequency in hertz.

The transmission magnitude response of the TCTF in dB is given by the following equation for 3.0 Gbps:

for 50 MHz < f < 3.0 GHz, and:

for 3.0 GHz < f < 5.0 GHz, where:

a) f is the signal frequency in hertz.

The TCTF is used to specify the requirements on transmitters that may or may not incorporate pre-emphasis or other forms of compensation. A compliance interconnect is any physical interconnect with loss equal to or greater than that of the T CT F at the abo ve frequencies that also mee ts th e ISI loss requirements shown i n ure 28 and figure 29.

Compliance with the TC TF te st l oa d r equ ireme n t is v eri fie d by me asu r ing the s i gna l pr od uced by the transmitter through a physical compliance interconnect attached to the transmitter.

Compliance with the zero-l ength test load requirement verified by measurement made acr oss a load equivalent to the zero-length load shown in figure 27.

5 437,–dB=

20–log10e() 65, 10

10 884,–dB=

××()20, 10

f××()33, 10

f2××()++()× dB×=

fig-

For both test load cases , the tr ansmitter deli vers the output v oltages an d timing li sted i n table 17 at the designated compliance points. The default mask is IR for intra-cabinet TxRx connections. The eye masks are shown in

9.5.2.1.

Cheetah 15K.4 SAS Product Manual, Rev. B 69

Figure 26 shows the compliance interconnect test load.

Tx +

10 nF 5 0 ohm

10 nF

Probe points

50 ohm

TCTF

Tx -

SAS internal connector

Figure 26. Compliance interconn ect test load

Figure 27 shows the zero-length test load.

Tx +

Tx -

10 nF

50 ohm

P robe points

50 ohm

SAS internal connector

Figure 27. Zero-length test load

Figure 28 shows an ISI loss example at 3.0 Gbps.

(dB)

Compliance interconnect magnitude response and

ISI loss

> 3.9 dB

0.9 dB

0.3

Figure 28. ISI loss example at 3.0 Gbps

ISI loss example for 3.0 Gbps

Sample complia nce in terconnect

3.01.5

Frequency (GH z)

70 Cheetah 15K.4 SAS Product Manual, Rev. B

Figure 29 shows an ISI loss example at 1.5 Gbps.

(dB)

ISI loss

> 2.0 dB

-5.4 dB

0.15

Compliance interconnect magnitude response and ISI

loss exam ple for 1.5 Gbps

Sample compliance interconnect

1.50.75

Frequency (GH z)

Figure 29. ISI loss example at 1.5 Gbps

9.5.2.5 Receiver characteristics

The drive receiver is A.C. coupled. The receive network terminates the TxRx connection by a 100 ohm equivalent impedance as specified in table 20.

The receiver operates wit hin a BE R of 10

-12

when a SAS signal with valid v ol tage and ti min g ch ar acter isti cs is delivered to the compliance p oint from a 1 00 ohm source. The received SAS signal are considered valid if it meets the voltage and timing limits specified in

table 17.

Additionally the rec eiver operates within th e BER objective when the si gnal at a receiving phy ha s the additional sinusoida l jitter present that is specified in table 19 and the common mode signal VCM over frequency range FCM as specified in table 15. T he j itter tol erance is s hown in Figu re 25 for all Rx complian ce po ints in a TxRx connection. The figure given assumes that any external interference occurs prior to the point at which the test is applied. Wh e n te st ing th e j it ter to ler a nce c apabil it y of a rec ei v er, the additional 0.1 UI of sinusoidal ji tter may be reduced by an amount propor tional to the actual externa lly induced interference betwe en the applic a tion point of the tes t and the input to the receiving phy. The additional jitter red uces the eye open ing in both voltage and time.

Cheetah 15K.4 SAS Product Manual, Rev. B 71

72 Cheetah 15K.4 SAS Product Manual, Rev. B

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Cheetah 15K.4 SAS Product Manual, Rev. B 73

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SeagateRMA.br@jabil.com

74 Cheetah 15K.4 SAS Product Manual, Rev. B

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For presales and technic al support in Europe , dial the Seagate Serv ice Center toll-free nu mber for your specific location. If yo ur location is not listed h ere, dial our presales and tech nical support call cen ter at +1-405324-4714 from 8:00

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here, dial our Euro pean CS O warr an ty ce nter at +31-20-316-7222 fr om 8:3 0

A.M. to 5:00 P.M. (Central Europ e

time) Monday through Friday. The CSO warranty center is located in Amsterdam, The Netherlands.

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Toll-free support numbers

Call center Presales and Technical Support Warranty Service

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For presales and tec hnical suppo rt in Africa and the Midd le East, dia l our presal es and technic al support c all center at +1-405-32 4-471 4 from 8:00 day through Friday. The presales and technical support call center is located in Oklahoma City, USA.

For warranty service in Africa and the Middle East, dial our Euro pean CSO warranty center at +31-20-3167222 from 8:30

A.M. to 5:00 P.M. (Centr al Euro pe time ) Mond ay throu gh Frid ay, or send a FAX to +31-20-653-

3513. The CSO warranty center is located in Amsterdam, The Netherlands.

A.M. to 11:45 A.M. and 1:00 P.M. to 5:00 P.M. (Central Europe time) Mon-

Cheetah 15K.4 SAS Product Manual, Rev. B 75

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For Asia/Pacific pr esales and technical s upport, dial the toll-fre e number for your specific location. The Asia / Pacific toll-free numbers are available from 6:00

A.M. to 10:45 A.M. and 12:00 P.M. to 6:00 P.M. (Australian East-

ern time) Monday through Friday, except as noted. If your location is not listed here, direct dial one of our technical support locations.

Warranty service is availabl e from 9:00 A.M. to 6:00 P.M. April through O ctober, and 10:00 A.M. to 7:00 P.M. November through March (Australian Eastern time) Monday through Friday.

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2, 4

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Hours of operation are 8:30 A.M. to 5:30 P.M., Monday through Friday (Australian Western time).

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76 Cheetah 15K.4 SAS Product Manual, Rev. B

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Cheetah 15K.4 SAS Product Manual, Rev. B 77

78 Cheetah 15K.4 SAS Product Manual, Rev. B

Index

Numerics

12 volt

pins 61

5 volt pins 61

abort task set function 45 AC coupling 61 AC power requirements 25 ACA active status 56 ACA active, faulted initiator status 56 acoustics 38 active LED Out signal 61 actuator 9

assembly design 7 adaptive caching 56 AFR 9, 18 air cleanliness 37 air flow 34, 42

illustrated 42 air inlet 42 altitude 35 ambient 34 ambient temperature 34, 42 Annualized Failure Rate 18 ANSI documents

SCSI 5

Serial Attached SCSI 5 asynchronous event notification 56 audible noise 3 auto write and read reallocation

programmable 8 automatic contingent allegiance 56 average idle current 25, 26 average rotational latency 11

backpanel 60 buffer

data 8

space 13 busy status 56 bytes per surface 11 bytes per track 11

cache operation 13 cache segments 14 caching write data 14 Canadian Department of Communications 3

capacity

unformatted 11 case temperature 34 check condition statu s 56 chemical pollutants 37 class B limit 3 clear ACA function 45 clear task set function 45 commands supported 47 condensation 35 condition met/good status 56 connector

illustrated 59

requirements 59 continuous vibration 37 cooling 42 corrosive environment 37 CRC

error 18 Current profiles 27 customer servic e 23

data block size

modifing the 9 data buffer to/from disc media 12 data heads

read/write 11 data rate

internal 11 data transfer rate 12 DC power 60

requirements 25 defect and error management 39 deferred error handling 56 description 7 dimensions 38 disc rotation speed 11 drive 37 drive characteris tic s 11 drive failure 18 drive malfunction 18 drive mounting 38, 43 drive select 60 dual port support 46

electrical

description of connector 60

signal characteristi cs 61

specifications 25 electromagnetic compatibility 3 electromagnetic susceptibility 38 EMI requirements 3

Cheetah 15K.4 SAS Product Manual, Rev. B 79

environment 42 environmental

limits 34 requirements 17

environmental control 37 error

management 39 rates 17

FCC rules and regulations 3 features 8

interface 45

firmware 8

corruption 50 flawed sector reallocati on 8 Format command execution time 12 function

complete, code 00 45

not supported, code 05 45

reject, code 04 45

Good status 56 gradient 34, 35 ground shift noise 61 grounding 43

HDA 42, 43 head and disc assembly (HDA) 7 head and disc assembly. See HDA heads

read/write data 11 heat removal 42 heat source 42 host equipment 43 hot plugging the drive 18 humidity 35 humidity limits 34

inquiry data 51 installation 41

guide 5 interface

commands supported 47

error rate 17

errors 18

illustrated 57

physical 57

requirements 45 interleave

minimum 12 intermediate/condition met/good status 56 intermediate/good status 56 internal data rate 11 internal defects/errors 39 internal drive characteristics 11

jumpers 41

latency

average rotational 11, 12 logical block address 13 logical block realloc ati on scheme 8 logical block size 8, 12 logical segments 13 LSI circuitry 9

maintenance 17 maximum delayed motor start 25, 26 maximum start current 25, 26 media description 8 minimum sector interleave 12 miscellaneous feature support

Adaptive caching 56

Asynchronous event notification 56

Automatic contingent allegiance 56

Deferred error handling 56

Parameter rounding 56

Queue tagging 56

Reporting actual retry count 56

Segmented caching 56

SMP = 1 in Mode Select command 56

Synchronized (locked) spindle operation 56

Zero latency read 56 miscellaneous status support

ACA active 56

ACA active, faulted initiator 56

Busy 56

Check condition 56

Condition met/good 56

Good 56

Intermediate/condition met/good 56

Intermediate/good 56

Reservation conflict 56

Task set full 56 miscorrected media data 17 Mode sense

data, table 51, 53 mounting 43

holes 43

orientations 41

80 Cheetah 15K.4 SAS Product Manual, Rev. B

MTBF 17, 18, 34 MTBF, see AFR 18

noise

audible 3 noise immunity 27 non-operating 35, 37

temperature 34 non-operating vibration 37

office environment 37 operating 35, 37 operating environment 18 option selection 60 options 10 orientation 35 out-of-plane distortion 43

package size 36 package test specification 5 packaged 36 parameter rounding 56 PCBA 43 peak bits per inch 11 peak operating current 25, 26 peak-to-peak measurements 27 performance characteristics

detailed 11

general 12 performance degradation 35 performance highlights 8 physical damage 37 physical dimensions 38 physical interface 57 physical specifications 25 pin descriptions 60 power 61

dissipation 31

requirements, AC 25

requirements, DC 25

sequencing 27 power distribution 3 power-on operating hours 18 power-up hours 18 prefetch/multi-seg men ted ca ch e contr ol 13 preventive maintenance 17

queue tagging 56

radio interference regulations 3 RCD bit 13 read error rates 17 read/write data heads 11 receivers 61 recommended mounting 36 Recoverable Errors 17 recovered media data 17 reference

documents 5 relative humidity 35 reliability 9

specifications 17 reliability and service 18 repair and return information 23 reporting actual retry count 56 reservation conflict status 56 resonance 35 return information 23 rotation speed 11

safety 3 SAS

interface 60

physical interface 57

task management functions 45 SAS documents 5 SAS Interface Manual 3, 5 SCSI interface

commands supported 47 seek error

defined 18

rate 17 seek performance characteristics 11 seek time

average typical 11

full stroke typical 11

single track typical 11 segmented caching 56 Self-Monitoring Analysis and Reporting Technology

9, 19 Serial Attached SCSI (SAS) Interface Manual 1 shielding 3 shipping 23 shipping container 34 shock 35

and vibration 35

shock mount 43 signal

characteristics 61 single-unit shipping pack kit 10 SMART 9, 19

Cheetah 15K.4 SAS Product Manual, Rev. B 81

SMP = 1 in Mode Select command 56 spindle brake 8 standards 3 start/stop time 12 Sulfur 37 support services 73 surface stiffness

allowable for non-flat surface 43

switches 41 synchronized spind le

operation 56

system chassis 43

task management functions 45

Abort task set 45 Clear ACA 45 Clear task set 45 terminate task 45

task management response codes 45

Function complete 00 45 Function not supported 05 45

Function reject 04 45 task set full status 56 technical support servic es 73 temperature 34, 42

ambient 34

case 34

gradient 34

limits 34

non-operating 34

regulation 3

See also cooling terminate task function 45 terminators 41 tracks per inch 11 tracks per surface 11 transmitters 61 transporting the drive 23

zone bit recording (ZBR) 8

unformatted 9 Unrecoverable Errors 17 unrecovered media data 17

vibration 35, 37

warranty 23

zero latency read 56

82 Cheetah 15K.4 SAS Product Manual, Rev. B

Seagate Technology LLC 920 Disc Drive, Scotts Valley, California 95066-4544, USA

Publication Number: 100350601, Rev. B, Printed in USA

Seagate ST336754SS - Cheetah 36.7 GB Hard Drive, Cheetah 15K.4 SAS, ST373454SS Product Manual

Specifications and Main Features

Frequently Asked Questions

User Manual