Table of Contents
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SCSI Commands
Field Descriptions
Sense Data Format
Field Descriptions
Field
Bytes
Bits
Operation
0
Code
Ignored
1
5-7
Logical
Unit
Allocation
4
Length
Reserved
Control
5
The Request Sense command returns sense data in the following format.
Bits
Byte
7
6
0
Valid
Error Code
1
2
FM
EOM
3
4
5
6
7
8
9
10
11
12
13
14
15
SKSV
C/D
16
17
18
19
20
21
Reserved
Field
Bytes
Bits
Valid
0
7
Error Code
0
0-6
Segment
1
Number
FM bit
2
7
Description
The Operation code for Request Sense is 03h.
The LUN field is residual from the SCSI-1 days and is ignored.
Specifies the amount of data to be returned, in bytes.
All reserved bits must be 0.
See Control Byte Format on page 18.
5
4
3
Segment Number
ILI
Reserved Sense Key
Information, MSB
Information
Information
Information, LSB
Additional Sense Length
Command-specific Information, MSB
Command-specific Information
Command-specific Information
Command-specific Information, LSB
Additional Sense Code
Additional Sense Code Qualifier
Field-Replaceable Unit Code
Reserved
BPV
Field Pointer, MSB
Field Pointer, LSB
Reserved
Reserved
Reserved
CLN
Description
0 = The Information field does not contain valid information
1 = The Information field contains valid information
This is always 0 for deferred errors.
70h = A current error, associated with the most recent command.
71h = A deferred error, not associated with the current command.
Always 0, because the Copy, Compare, and Copy and Verify com-
mands are not supported.
1 = A Space, Read, or Verify command did not complete because a
file mark was read.
Page 99
2
1
0
Bit Pointer
Reserved
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