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SCSI Commands
Quantum DLT 7000 Tape System 5-137
5.15 READ POSITION COMMAND (34h)
The READ POSITION command is used to read a position identifier or SCSI Logical
Block Address (LBA). The LOCATE command uses this identifier to position back to
this same logical position in a high-performance fashion.
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (34h)
1 Logical Unit Number Reserved BT
2 - 8 Reserved
9 Unused Reserved Flag Link
Figure 5–67 READ POSITION Command Descriptor Block - Data Format
Table 5–65 READ POSITION Command Descriptor Block - Field Descriptions
Field Name Description
BT Block Type. This bit indicates how the position is to be interpreted. Since the
tape drive uses the same logical block regardless of the setting of this bit, the
setting is ignored. The logical block address values include all recorded objects:
blocks and filemarks.
NOTE
The drive returns CHECK CONDITION with UNIT NOT READY sense
key with the READ POSITION command if the media is not ready to
be accessed.
- DLT™7000 Tape System 1
- Product Manual 1
- TABLE OF CONTENTS 7
- REVISION HISTORY 19
- Revision History 20
- Quantum DLT 7000 Tape System 20
- ABOUT THIS MANUAL 21
- CONVENTIONS 23
- FOR MORE INFORMATION… 23
- READER COMMENTS 24
- Chapter 1 25
- 1.2 PRODUCT FEATURES 26
- 1.3 PRODUCT SPECIFICATIONS 26
- 1.3.2 Interface Type 27
- 1.3.3 Storage Capacity 27
- 1.3.4 Reliability (Projected) 27
- 1.3.5 Performance Data 28
- 1.3.7 Power Requirements 32
- 1.3.8 Current Requirements 33
- 1.3.14 Conducted Emissions 36
- 1.3.15 Radiated Emissions 37
- 1.3.16 Susceptibility 37
- Chapter 2 39
- HARDWARE IMPLEMENTATION 39
- 2.1.1 Safety Precautions 40
- 2.1.2 Handling 40
- Hardware Implementation 43
- 4-Pin Power Connector 47
- Drive Back 47
- SCSI-2 Connector 47
- SCSI ID Pushbutton 51
- Power Switch 51
- Power Connector 51
- SCSI Connector (2) 51
- 220 / 240 V 53
- Table 2–6 LED Functionality 55
- 2.4.2 Selecting Density 59
- 2.5 POWER ON SELF TEST (POST) 61
- 2.6 TROUBLESHOOTING 63
- Chapter 3 65
- SCSI DESCRIPTION 65
- 3.2 SCSI COMMANDS 66
- SCSI Description 67
- 3.3 SIGNAL STATES 68
- 3.3.2 SCSI ID Bits 69
- 3.4 SCSI SIGNALS 70
- 3.4.2 Signal Bus Timing 71
- 3.5 SCSI BUS PHASES 74
- Messages Received by Drive: 75
- 3.5.2 ARBITRATION Phase 76
- 3.5.3 SELECTION Phase 77
- The initiator: 78
- The drive: 78
- 3.5.4 RESELECTION Phase 79
- 3.6 SCSI BUS CONDITIONS 88
- 3.6.2 Reset Condition 89
- 3.6.3 Queued Unit Attentions 90
- Chapter 4 91
- MESSAGES 91
- Messages 94
- 4.2 SUPPORTED SCSI MESSAGES 95
- 4.2.12 NO OPERATION (08h) 101
- • After a power cycle 103
- Chapter 5 105
- SCSI COMMANDS 105
- SCSI Commands 106
- 5.1.1 SCSI Pointers 107
- 5.1.3 Status/Error Reporting 110
- 5.2 SCSI COMMAND DESCRIPTIONS 116
- 5.3 ERASE COMMAND (19h) 118
- 5.4 INQUIRY COMMAND (12h) 119
- 5.6 LOCATE COMMAND (2Bh) 134
- 5.7 LOG SELECT COMMAND (4Ch) 136
- 5.7.2 Operation of LOG SELECT 138
- 5.8 LOG SENSE COMMAND (4Dh) 143
- • A page is not supported 146
- • The SP bit is set to 1 146
- • PPC bit set to 1 146
- (continued) 150
- 5.8.5 TapeAlert Page (2Eh) 154
- 0000h – 000Fh) 164
- 0000h, 0001h, or 0002h) 167
- 5.9.1 Mode Parameter List 171
- 5.9.8 TapeAlert Page (1Ch) 191
- 5.10.3 MODE SENSE Mode Pages 212
- 5.12 READ COMMAND (08h) 232
- READ Command (08h) 233
- 5.14.2 Data Mode 239
- 5.14.3 Descriptor Mode 240
- • A hard reset occurs 260
- 5.20 REWIND COMMAND (01h) 261
- 5.22 SPACE COMMAND (11h) 267
- 5.24 VERIFY COMMAND (13h) 270
- 5.25 WRITE COMMAND (0Ah) 272
- 5.26.2 Write Data Mode (010b) 275
- Appendix A 279
- INFORMATION 279
- Appendix B 283
- B.2 BUGCHECK PACKETS 284
- B.2.2 Event Log Packets 285
- Appendix C 287
- UPDATING THE FIRMWARE 287
- • Examines the data 289
- • Power failure 290
- Appendix D 293
- THE TAPE CARTRIDGE 293
- Reel Lock Opening 296
- Spring-Loaded Hub 297
- WRITE-PROTECTION 300
- D.4 LOADING A TAPE CARTRIDGE 302
- *81-60000-06 A01* 312
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