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SCSI Commands
Quantum DLT 4000 Tape Drive 5-53
LOG SENSE Command (4Dh) (continued)
Table 5–26 Log Parameters for Read / Write Compression Ratio LOG SENSE Page Field
Descriptions (Parameter Codes 02h through 09h) (continued)
Field Name Description
DU Disable Update. Always 0.
DS Disable Save. Not supported. This bit always set to 1.
TSD Target Save Disable. Not supported. This bit always set to 1.
ETC Enable Threshold Comparison. Threshold checking is not supported on this
page. Always set to 0.
TMC Threshold Met Criteria. Always 0.
LP List Parameter. Always set to 0 (parameter codes treated as data counter).
Counter
Value
Parameter Codes 02h through 09h provide a count of the number of bytes
transferred since the current tape cartridge was inserted or since the last time
the counters were reset via a MODE SELECT command.
Parameter Codes 02h and 03h -- Report the count of bytes transferred from
the tape drive to the initiator. Parameter Code 02h reports the number of full
megabytes transferred; Parameter Code 03h reports the number of bytes less
than a full megabyte that have been transferred. Multiplying the counter
returned for Parameter Code 02h by 1,048,576 and then adding the value of
the counter returned by Parameter Code 03h results in the actual total bytes
transferred to the initiator.
Parameter Codes 04h and 05h -- Report the count of bytes transferred from
the tape drive to the buffer. Parameter Code 04h reports the number of full
megabytes transferred; Parameter Code 05h reports the number of bytes less
than a full megabyte that have been transferred. Multiplying the counter
returned for Parameter Code 04h by 1,048,576 and then adding the value of
the counter returned by Parameter Code 05h results in the actual total bytes
transferred from tape to the buffer.
- DLT™4000 Tape Drive 1
- Product Manual 1
- TABLE OF CONTENTS 7
- REVISION HISTORY 19
- Revision History 20
- Quantum DLT 4000 Tape Drive 20
- ABOUT THIS MANUAL 21
- CONVENTIONS 23
- READER COMMENTS 23
- About This Manual 24
- Chapter 1 25
- Tabletop Version 1 26
- Tabletop Version 2 26
- 1.2 PRODUCT FEATURES 27
- 1.3 PRODUCT SPECIFICATIONS 27
- 1.3.2 Interface Type 28
- 1.3.3 Storage Capacity 28
- 1.3.4 Performance Data 28
- 1.3.6 Power Requirements 31
- 1.3.9 Reliability (Projected) 32
- Chapter 2 35
- HARDWARE IMPLEMENTATION 35
- 2.1.1 Safety Precautions 36
- 2.1.2 Handling 36
- 2.2 DRIVE SETUP 37
- Hardware Implementation 39
- SCSI ID Pushbutton 41
- 2.3 DRIVE INSTALLATION 42
- 2.4 DRIVE CONNECTIONS 44
- Pin Number Signal Name 48
- 1 +12 VDC 48
- 2 Ground (+12 V return) 48
- 3 Ground (+5 V return) 48
- 4 +5 VDC 48
- Table 2–5 LED Functionality 52
- 2.5.2 Selecting Density 56
- 2.6 POWER ON SELF TEST (POST) 58
- 2.7 TROUBLESHOOTING 60
- Chapter 3 63
- SCSI DESCRIPTION 63
- SCSI Description 64
- 3.3 SIGNAL STATES 66
- Table 3–2 Signal Sources 67
- 3.4 SCSI SIGNALS 68
- 3.4.2 Signal Bus Timing 69
- 3.5 SCSI BUS PHASES 72
- • DISCONNECT 73
- • COMMAND COMPLETE 73
- 3.5.3 SELECTION Phase 75
- The initiator: 76
- The drive: 76
- 3.5.4 RESELECTION Phase 77
- Table 3–6 Status Bytes 85
- 3.6 SCSI BUS CONDITIONS 86
- 3.6.2 Reset Condition 87
- 3.6.3 Queued Unit Attentions 88
- Chapter 4 89
- MESSAGES 89
- 4.2 SUPPORTED SCSI MESSAGES 93
- Messages 100
- Chapter 5 101
- SCSI COMMANDS 101
- SCSI Commands 102
- 5.1.1 SCSI Pointers 103
- 5.1.3 Status/Error Reporting 107
- 5.2 SCSI COMMAND DESCRIPTIONS 113
- 5.3 ERASE COMMAND (19H) 115
- 5.4 INQUIRY COMMAND (12H) 117
- 5.6 LOCATE COMMAND (2BH) 130
- 5.7 LOG SELECT COMMAND (4CH) 132
- 5.7.2 Operation of LOG SELECT 134
- 5.8 LOG SENSE COMMAND (4DH) 139
- • A page is not supported 142
- • The SP bit is set to 1 142
- • PPC bit is set to 1 142
- (continued) 146
- 0000h – 000Fh) 156
- 0000h, 0001h, or 0002h) 159
- 5.9.1 Mode Parameter List 163
- 5.10.3 MODE SENSE Mode Pages 199
- Data Format 215
- 5.12 READ COMMAND (08H) 217
- 5.14.2 Data Mode 224
- 5.14.3 Descriptor Mode 224
- • A hard reset occurs 245
- 5.23 SPACE COMMAND (11H) 252
- 5.25 VERIFY COMMAND (13H) 255
- 5.26 WRITE COMMAND (0AH) 257
- 5.27.2 Write Data Mode (010b) 260
- Appendix A 265
- INFORMATION 265
- Appendix B 269
- B.2.1 POST Failure Packets 270
- B.2.2 Event Log Packets 271
- Appendix C 275
- UPDATING THE FIRMWARE 275
- • Examines the data 277
- Appendix D 281
- THE TAPE CARTRIDGE 281
- Reel Lock Opening 284
- Spring-Loaded Hub 285
- WRITE-PROTECTION 288
- D.4 LOADING A TAPE CARTRIDGE 290
- *81-60043-04 A01* 300
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