Seagate BARRACUDA 2LP

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Publication number: 83328930, Rev. D

January 1996

Seagate

, Seagate Technology

, and the Seagate logo are registered

trademarks of Seagate Technology, Inc. Barracuda™ is a trademark of

Seagate Technology, Inc. Other product names are registered trademarks

or trademarks of their owners.

Seagate reserves the right to change, without notice, product offerings or

specifications. No part of this publication may be reproduced in any form

without written permission from Seagate Technology, Inc.

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

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Table of Contents8
Scope12
Figure 1. Barracuda 2LP Disc Drive (ST32550N Drive Shown)12
Applicable Standard and Reference Documentation14
Standards14
Applicable Reference Documents14
General Description16
Figure 2. Barracuda 2LP Disc Drive (Exploded View)16
Standard Features18
Performance18
Reliability18
Unformatted and Formatted Capacities19
Options19
Installation20
Performance Characteristics22
Internal Drive Characteristics22
SCSI Seek Performance Characteristics22
Seek Time24
Format Drive Command Execution Time24
Figure 3. ASA I OEM Thermal Calibration24
General Performance Characteristics25
Start/Stop Time26
Prefetch/Multi-Segmented Cache Control26
Caching Write Data27
Synchronized Spindle Operation28
Figure 4. Synchronized Drive Interconnect Diagram28
Figure 5. Synchronized Reference Signal Characteristics29
Reliability Specifications32
Error Rates32
Environmental Interference32
Write Errors32
Seek Errors33
Reliability and Service33
Mean Time between Failures (MTBF)33
Air Flow33
Figure 6. Air Flow Pattern (ST32550N Drive Shown)34
Figure 7. WYGX Temperature Measurement Locations35
Figure 8. HYHX Temperature Measurement Locations36
Figure 9. JYHX Temperature Measurement Locations37
Figure 10. KYHX Temperature Measurement Locations38
Figure 11. ZYHX Temperature Measurement Locations39
Figure 12. PYJX Temperature Measurement Locations40
Figure 13. Temperature Measurement Location (ST32550N Shown)40
Preventive Maintenance41
Service Life41
Service Philosophy41
Installation41
Service Tools41
Hot Plugging Barracuda 2LP Disc Drives41
Physical/Electrical Specifications44
AC Power Requirements44
DC Power Requirements44
Conducted Noise Immunity45
Power Sequencing45
Current Profile46
Figure 14. Barracuda 2LP Drives Typical +12V Current Profile46
Heat/Power Dissipation47
Environmental Limits47
Temperature47
Relative Humidity47
Effective Altitude (Sea Level)48
Shock and Vibration48
Air Cleanliness49
Acoustics49
Electromagnetic Compatibility49
Mechanical Specifications50
Figure 15. ST31250N/ND and ST32550N/ND Mounting Configuration Dimensions50
Figure 16. ST31250W/WD and ST32550W/WD Mounting Configuration Dimensions51
Figure 17. ST31250WC/DC and ST32550WC/DC Mounting Configuration Dimensions52
Drive Orientation53
Cooling53
Drive Mounting53
Figure 18. Recommended Mounting53
Media Characteristics54
Media Description54
Defect and Error Management56
Defects and Errors56
Option/Configuration Headers58
Drive ID/Option Select Headers58
ST31250N/ND and ST32550N/ND Configuration58
Figure 19. ST31250N/ND and ST32550N/ND Jumper Connectors58
ST31250W/WD and ST32550W/WD Configuration61
Figure 20. ST31250W/WD and ST32550W/WD Jumper Connectors61
ST31250WC/DC and ST32550WC/DC Configuration64
Figure 21. ST31250WC/DC and ST32550WC/DC Jumper Connectors64
Synchronized Spindles Interface66
Electrical Description66
Figure 22. SCSI Reference Index Signal Driver/Receiver Combination66
Figure 23. ST31250N/ND and ST32550N/ND Configuration Select Header67
Figure 24. ST31250W/WD and ST32550W/WD Configuration Select Header67
Grounding68
Figure 25. ST31250WC/DC and ST32550WC/DC Configuration Select Header68
Interface Requirements70
General Description70
SCSI Interface Messages Supported70
Table 1. SCSI Interface Messages Supported70
SCSI Interface Commands Supported71
Table 2. Supported Commands71
Inquiry Data73
Table 3. Barracuda 2LP Family Drive Inquiry Data-ASA I73
Table 4. Barracuda 2LP Family Drive Inquiry Data-ASA II73
Mode Sense Data74
Table 5. Mode Sense Data, ST31250 Default Values-ASA I (SCSI-1 Implementation)74
Table 6. Mode Sense Data, ST32550 Default Values-ASA I (SCSI-1 Implementation)74
Table 7. Mode Sense Data, ST31250 Default Values-ASA I (SCSI-2 Implementation)75
Table 8. Mode Sense Data, ST32550 Default Values-ASA I (SCS-2 Implementation)75
Table 9. Mode Sense Data, ST31250 Default Values-ASA II (SCSI-2 Implementation)76
Table 10. Mode Sense Data, ST32550 Default Values-ASA II (SCSI-2 Implementation)76
SCSI Bus Conditions and Miscellaneous Features Supported77
Table 11. SCSI Bus Conditions and Other Miscellaneous Features77
Synchronous Data Transfer78
Synchronous Data Transfer Periods Supported78
REQ/ACK Offset78
Table 12. Synchronous Data Transfer Periods78
DC Cable and Connector79
SCSI Physical Interface79
Figure 26. ST31250N/ND and ST32550N/ND Physical Interface79
Table 13. Mating Connector Parts79
Figure 27. ST31250W/WD and ST32550W/WD Physical Interface80
Figure 28. ST31250WC/DC and ST32550WC/DC Physical Interface80
Physical Characteristics81
Connector Requirements82
Electrical Description83
Figure 29. Single-Ended Transmitters and Receivers84
Figure 30. Typical Differential I/O Line Transmitter/Receiver and Terminators85
SCSI Non-Wide Physical Interface87
Figure 31. Non-Shielded SCSI Device Connector87
Table 14. Single-Ended Cable Pin Assignments for ST31250N and ST32550N Drives88
Table 15. Differential Cable Pin Assignments for ST31250ND and ST32550ND Drives89
SCSI Wide Physical Interface90
Figure 32. Wide SCSI Device Connector90
Table 16. Single-Ended Contact Assignments for ST31250W and ST32550W Drives91
Table 17. Differential Contact Assignments for ST31250WD and ST32550WD Drives92
SCSI Single-Connector Attachment (SCA) Physical Interface93
Figure 33. Non-Shielded, 80-Pin I/O and DC Power Single-Connector Attachment (SCA)93
Table 18. SCA Contact Assignments for ST31250WC and ST32550WC Drives94
Table 19. SCA Contact Assignments for ST31250DC and ST32550DC Drives95
Table 20. Disc Drive SCSI Timing96
Index98

Seagate BARRACUDA 2LP - Page 5

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