Reference Guide

Chapter 4 SCSI Commands
REQUEST SENSE Command (03h)
DLT-S4 Interface Reference Guide 306
The Sense Data are valid for a CHECK CONDITION or RESERVATION
CONFLICT
status returned on the previous command. The drive preserves
the Sense Data bytes until it is passed to the host as autosense data, it is
retrieved by a
REQUEST SENSE command or until the receipt of any other
command from the same initiator, though some commands, such as
INQUIRY, do not change Sense Data.
If the drive receives an unsolicited
REQUEST SENSE, it returns Sense Data
with the appropriate values in the End of Media (EOM), Sense Key,
Additional Sense Code, and Additional Sense Code Qualifier fields.
Figure 159
illustrates the REQUEST SENSE data format.
Figure 159 REQUEST
SENSE—Data Format
Bit
7 6 5 4 3 2 1 0
Byte
0 Valid Response Code (70h or 71h)
1 Obsolete
2 Filemark EOM ILI Reserved Sense Key
3 — 6
(MSB)
Information
(LSB)
7 Additional Sense Length (n – 7)
8 — 11
(MSB)
Command Specific Information
(LSB)
12 Additional Sense Code (ASC)
13 Additional Sense Code Qualifier (ASCQ)
14 Field Replaceable Unit Code
15 SKSV C/D Reserved BPV Bit Pointer