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SCSI Commands: 29BREAD ATTRIBUTE
Page
128
3.17
READ ATTRIBUTE
The READ ATTRIBUTE command allows the application client to READ
ATTRIBUTE values from medium auxiliary memory.
3.17.1
READ ATTRIBUTE Command Descriptor Block
Bits
Byte
7 6 5 4 3 2 1 0
0
OPERATION CODE 8Ch
1
Reserved SERVICE
ACTION
2
(MSB)
4
Restricted (See SMC-2)
(LSB)
5
VOLUME NUMBER
6
Reserved
7
PARTITION NUMBER
8
(MSB)
9
FIRST ATTRIBUTE IDENTIFIER
(LSB)
10
(MSB)
13
ALLOCATION LENGTH
(LSB)
14
Reserved
15
CONTROL
3.17.1.1
READ ATTRIBUTE Command Field Descriptions
Field
Bytes
Bits
Description
OPERATION
CODE
0
The operation code for the READ ATTRIBUTE command is 8Ch.
SERVICE
ACTION
1 0-4
Service
Action
0h = return attribute values.
1h = return a list of available attribute identifiers.
2h = return a list of known volume numbers.
3h = return a list of known partition numbers.
VOLUME
NUMBER
5
Always 0 – the drive only supports a single volume
PARTITION
NUMBER
7
Always 0 – the LTO format only supports a single partition
FIRST
ATTRIBUTE
IDENTIFIER
8-9
Specifies the attribute identifier of the first attribute to be returned.
ALLOCATION
LENGTH
10-13
Specifies the maximum number of bytes the application client has
allocated in the Data-In Buffer.
Reserved
All reserved bits must be 0.
CONTROL 15 See
SCSI Command Control Byte Format on page 25.
Summary of Contents for LTO 4
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