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SCSI Commands
5-98 Quantum DLT 4000 Tape Drive
MODE SENSE (6) / (10) Command (1Ah / 5Ah) (continued)
Table 5–47 MODE SENSE Block Descriptor - Field Descriptions
Field Name Description
Density Code The contents of this field match the density of the media, or 0 if the density is
unknown:
Density Code
00h
0Ah
16h
17h
18h
19h
1Ah
Description
Use default density.
6667 bpi MFM serial cartridge tape X3B5/86-199 (read only).
10000 bpi MFM serial cartridge tape X3.193-1990 (read only).
42500 bpi MFM serial cartridge tape X3B5/91- 2.6 GB (DLTtape III
only).
Same as 17h, but with 56 track pairs vs. 24 - 6.0 GB (DLTtape III
only).
62500 bpi, 64 track pairs, serial cartridge tape - 10.0 GB (DLTtape
III only) /15.0 GB (DLTtape IIIxt only)
81633 bpi, 64 track pairs, serial cartridge tape - 20.0 GB (DLTtape
IV only)
The density codes above are the preferred codes used to define density.
Additionally, the following codes may be used, though use of the Data
Compression Page is preferred (these codes are only returned if they were set using
the MODE SELECT command):
80h 62500 bpi, 64 track pairs, serial cartridge tape - 10.0 GB (DLTtape III)
/15.0 GB (DLTtape IIIxt) without compression
81h 62500 bpi, 64 track pairs, serial cartridge tape - 20.0 GB (DLTtape III)
/30.0 GB (DLTtape IIIxt) with compression
82h 81633 bpi, 64 track pairs, serial cartridge tape - 20.0 GB (DLTtape IV)
without compression
83h 81633 bpi, 64 track pairs, serial cartridge tape - 40 GB (DLTtape IV) with
compression
Number of
Blocks
This field is sent as 0, indicating that all of the remaining logical blocks on the tape
have the medium characteristics specified by the block descriptor.
Block Length This field specifies the length (in bytes) of each logical block transferred over the
SCSI bus. A block length of 0 indicates that the length is variable (as specified in the
I/O command). Any other value indicates the number of bytes per block that are
used for READ, WRITE, and VERIFY type commands that specify a fixed bit of 1
(fixed block mode).
- 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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