Quantum DAT 24 Drive Guía de usuario Pagina 170
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Page 158 DDS-4 SCSI Interface Manual, Rev. B
TEST UNIT READY (00h)
The TEST UNIT READY command tests for three conditions:
• The drive is powered on.
• A cartridge is inserted in the drive.
• The drive is ready to accept a medium-access command.
If these three conditions are met, the drive returns Good Status.
This command does not access the medium or initiate a diagnostic routine.
Note: For autoloaders, the Test Unit Ready command will be accepted by LUN 1
and will test the readiness of the autoloader to accept media movement
commands.
TEST UNIT READY Command Descriptor Block
The following table shows the layout of the Command Descriptor Block.
Byte
Bits
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0 0
2 0 0 0 0 0 0 0 0
3 0 0 0 0 0 0 0 0
4 0 0 0 0 0 0 0 0
5 vendor unique* 0 0 0 0 Flag Link
* This vendor-unique field is reserved and must be set to zero.
TEST UNIT READY Detailed Operation
The following text lists the sense keys plus the additional sense codes and qualifiers
reported by the drive during various stages of loading and unloading cartridges. The
format of the values is additional sense code/additional sense qualifier. In all other
cases, CHECK (02) is returned.
In the following table and text, NOT READY indicates a sense key of 02, and UNIT
ATTN indicates a sense key of 06.
Action
First TUR response
Response while
Ejecting
Response after Tape is Out
Press eject NOT READY 5A/01 NOT READY 04/03 NOT READY 3A/00
UNLOAD
command
NOT READY 04/03,
IMMED=1
NOT READY 04/03,
IMMED=1
NOT READY 3A/00
Insert, then eject NOT READY 5A/01 NOT READY 04/03 NOT READY 3A/00
- Contents 5
- Commands 34 6
- Introduction 13
- SCSI Interface Description 14
- Signal Descriptions 15
- Command Set Description 16
- General features 17
- SCSI Bus Protocol 18
- Waiting and Control Phases 19
- Figure 2-1 20
- Figure 2-2 20
- Select With Attention 22
- Identify Message 22
- Information Transfer Phases 23
- Figure 2-4 24
- Synchronous Data Transfer 25
- Command Phase 26
- Data Phase 27
- Status Phase 27
- Message Phase 27
- Command Descriptor Block 28
- Logical Unit Support 29
- Attention Condition 36
- Reset Condition 36
- Unit Attention Condition 36
- Buffered Mode 37
- Immediate Function 37
- Residual Length Function 37
- SCSI Memory Address Pointers 39
- Early Warning Function 39
- Error Reporting 40
- Autoloader Operation 41
- General Operation 43
- Loading and Initialization 43
- Front Panel Operation 44
- Cassette Selection 44
- Automatic Loading Mode 44
- Magazine Ejection 45
- Stray Tape Recovery 45
- Commands 46
- Conventions 47
- ERASE (19h) 49
- INQUIRY (12h) 53
- Standard INQUIRY Data Format 54
- LOAD/UNLOAD (1Bh) 57
- LOCATE (2Bh) 59
- LOCATE and the BT Bit 60
- LOG SELECT (4Ch) 62
- Use of the PC Bits 63
- LOG SELECT Parameter Data 64
- LOG SENSE (4Dh) 69
- Using Page Control Bits 71
- Log Sense Pages 72
- Page Header 73
- MODE SELECT (15h) 85
- MODE SELECT Parameters 86
- Completion Status 100
- MODE SENSE (1Ah) 101
- MODE SENSE Parameters 103
- Mode Page Format 105
- READ (08h) 117
- READ BLOCK LIMITS (05h) 122
- READ DATA BUFFER (3Ch) 124
- READ DATA BUFFER Header 125
- Element Status Data 126
- Element Status Data Header 127
- READ POSITION (34h) 131
- READ POSITION Data Format 132
- RELEASE UNIT (17h / 57h) 138
- REPORT DENSITY SUPPORT (44h) 140
- REQUEST BLOCK ADDRESS (02h) 143
- REQUEST SENSE (03h) 145
- Definition of Sense Keys 147
- RESERVE UNIT (16h / 56h) 158
- REWIND (01h) 161
- SEEK BLOCK (0Ch) 162
- SEND DIAGNOSTIC (1Dh) 164
- SPACE (11h) 166
- Space-by-Count Functions 167
- Space and the RSMK Bit 168
- TEST UNIT READY (00h) 170
- VERIFY (13h) 172
- WRITE (0Ah) 174
- WRITE DATA BUFFER (3Bh) 176
- WRITE FILEMARKS (10h) 179
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