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Page 160 DDS-4 SCSI Interface Manual, Rev. B
VERIFY (13h)
The VERIFY command verifies one or more blocks of data beginning with the next
block from the tape unit.
The command terminates after the specified number of bytes or blocks are verified
or when the drive encounters a filemark, the EOT, or an unrecoverable error. On
completion the medium is positioned after the last block verified or after a filemark.
If a VERIFY with a zero verification length is issued, no data is verified, and the
current position on the tape does not change. This condition is not considered an
error.
VERIFY 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 1 0 0 1 1
1 0 0 0 0 0 0 0 Fixed
2 MSB—Verify Length
3 Verify Length
4 Verify Length—LSB
5 vendor unique* 0 0 0 0 Flag Link
* This vendor-unique field is reserved and must be set to zero.
Command Descriptor Block Field Description
The following table defines the fields in the CDB.
Field
Name
Bytes
Bits
Description
Fixed
Block
Size bit
1 0 If this bit is 0, block is variable length. IF this bit is 1, blocks are fixed
length.
Verify
Length
2-4 This field specifies the number of contiguous bytes or blocks to be
verified in fixed mode or the length of the variable block..
Data Blocks Verified
Errors detected cause a Check Condition with the Sense Key set to 0E
hexadecimal, which indicates a data correction error. The residual byte or block
count is reflected in the REQUEST SENSE data.
When the Fixed bit is set (1), the Verify Length specifies the number of contiguous
blocks to be verified on the tape. When the Fixed bit is reset (0), the Verify Length
specifies the number of bytes in the block to verify.
- 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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