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SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5–197
5.37 REZERO UNIT Command (01h)
The REZERO UNIT command sends the heads to cylinder 0 (Logical Block Address
0). Once the heads are on the track, they are not guaranteed to stay at cylinder 0;
periodic calibrations may send them to a different cylinder. If periodic calibrations
have been disabled by using the MAN bit (byte 3, bit 6) of the Vendor Unique
Function Control Page in the MODE SELECT command (15h), the REZERO UNIT
command will cause the drive to perform the next scheduled calibration.
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (01h)
1 - 4 Reserved
5 Control
Figure 5–94 REZERO UNIT Command Descriptor Block — Data Format
- Quantum Atlas 1
- 10K II 9.2/18.4/36.7/73.4 GB 1
- Ultra 160/m S 1
- Product Manual 1
- CONTENTS 3
- Chapter 4 SPECIFICATIONS 4
- Chapter 5 SCSI DESCRIPTION 4
- Appendix A QUICK REFERENCE 7
- Contents 10
- Figures (continued) 12
- Tables (continued) 16
- REVISION RECORD 20
- Revision Record 21
- ABOUT THIS MANUAL 22
- 1.4 REFERENCES 24
- About This Manual 25
- GENERAL DESCRIPTION 26
- 2.4 HARDWARE REQUIREMENTS 27
- INSTALLATION 28
- 3.2 SPACE REQUIREMENTS 30
- Shock Feet 31
- 3.3 UNPACKING INSTRUCTIONS 32
- SCSI Connector 33
- Installation 34
- DRIVES WITH 68-PIN SCSI 34
- CONNECTOR 34
- Connector) 38
- Versions 39
- Connector 45
- 3.6.1 Orientation 47
- 160/m SCSI Hard Disk Drive 48
- 3.6.3 Shock Clip 50
- 3.6.4 Mounting 50
- 3.6.5 Ventilation 50
- 3.6.9 Drive Connections 53
- 3.6.9.1 SCSI Bus Connection 53
- 3.6.9.2 Power Connection 53
- 3.6.9.3 Cables 54
- SPECIFICATIONS 56
- Specifications 57
- 4.2 FORMATTED CAPACITY 58
- 4.3 DATA TRANSFER RATES 59
- 4.4 TIMING SPECIFICATIONS 60
- 4.5 POWER 61
- 4.5.1 Power Sequencing 61
- 4.5.2 Power Reset Limits 61
- 4.5.3 Power Requirements 62
- 4.5.3.1 Power Consumption 62
- 4.5.3.2 DC Voltage Tolerances 62
- 4.5.3.3 Current Requirements 63
- Spin-Up Mode 63
- Idle Mode 63
- ECMA Seek Mode 63
- 4.5.3.4 Current Transients 64
- Active Mode (ECMA Seeking) 64
- 4.5.3.6 DC Voltage Monitoring 64
- 4.6 ACOUSTICS 65
- 4.7 MECHANICAL 65
- 4.8 ENVIRONMENTAL CONDITIONS 66
- 4.9 SHOCK AND VIBRATION 66
- 4.10 RELIABILITY 67
- SCSI DESCRIPTION 68
- 5.2 Command Descriptor Block 72
- 5.3 Status/Error Reporting 76
- Table 5–4 Status Codes 77
- Condition 78
- 5.6 Linked Commands 82
- 5.8 SCSI COMMAND DESCRIPTIONS 88
- Common Fields 88
- Index Format 97
- 5.11 INQUIRY Command (12h) 100
- SCSI Description 101
- INQUIRY command if EVPD = 0 102
- 5.13 LOG SENSE Command (4Dh) 120
- 5.13.2 LOG SENSE Log Pages 123
- 5.14.2 Mode Page Types 128
- 5.14.3 Mode Parameter List 128
- 5.14.3.6 Caching Page (08h) 140
- (continued) 155
- 5.16.1 Read-Only Mode Pages 171
- Descriptions (continued) 185
- Persistent 189
- Reservation 189
- Attempted 189
- 5.20 READ (6) Command (08h) 202
- 5.21 READ (10) Command (28h) 204
- 7 6 5 4 3 2 1 0 209
- 4 - 7 Block Length in Bytes 209
- 5.26 READ LONG Command (3Eh) 218
- Descriptions 225
- 5.34.2 Clearing Sense Data 239
- 5.34.3 Status Reporting 239
- SKSV = 1 256
- 5.38 SEEK (6) Command (0Bh) 266
- 5.39 SEEK (10) Command (2Bh) 268
- 5.45 VERIFY Command (2Fh) 280
- 5.46 WRITE (6) Command (0Ah) 282
- FEATURE DESCRIPTIONS 302
- 6.2 PREFETCH 303
- 6.3 WRITE-BACK CACHING 303
- 6.4 ZERO LATENCY READ/WRITE 304
- 6.5 DISCONNECT-RECONNECT 304
- 6.7 AVERAGE ACCESS TIME 304
- 6.8 EMBEDDED SERVO SYSTEM 305
- 6.9.1 Media Error Protection 305
- 6.9.5 Data Verification 306
- 6.10 TAGGED COMMAND QUEUING 306
- 6.11 COMMAND REORDERING 307
- 6.12 BANDED RECORDING 307
- 6.13 SPECIAL FUNCTIONS 307
- 6.14 POWER MANAGEMENT 307
- require operator 307
- 6.15 DIAGNOSTICS 308
- 6.15.3 Host Diagnostics 309
- 6.15.4 Log Sense 309
- 6.16 ERROR RECOVERY 309
- 6.16.1 Seek Error Recovery 309
- 6.16.2 Data Read Errors 309
- INTERFACE 310
- 6.17.1DIFFSENS 311
- 6.17.5 DOMAIN VALIDATION 313
- System Considerations 314
- Feature Descriptions 315
- Quick Reference 316
- Appendix A. Quick Reference 317
- SCSI REFERENCE INFORMATION 322
- B.2 SCSI-3 Bus Timing 325
- B.3 Signal States 330
- B.4 SCSI Signals 332
- B.5 SCSI Bus Phases 333
- B.5.2 ARBITRATION Phase 334
- B.5.3 SELECTION Phase 335
- B.5.4 RESELECTION Phase 336
- B.5.5.3 Wide Data Transfer 342
- B.6 SCSI Bus Conditions 344
- B.6.2 Reset Condition 345
- B.7 SCSI MESSAGE FORMAT 346
- B.8 SUPPORTED SCSI MESSAGES 349
- Bit 7 6 5 4 3 2 1 0 354
- 1 Queue Tag 354
- Appendix C 364
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