Optical Drive and Library SCSI-2 Command Reference

Jukebox SCSI-2 Command Set
Request Sense Command (03H)
Chapter 33-8
Request Sense Command (03H)
This command determines the specific error condition when the library
fails to successfully complete a command and returns a check condition
status. (Sense data is preserved for the initiator until retrieved by a
Request Sense Command or until the initiator sends another command.)
Codes are used to represent the error condition and this information can
be used to determine what type of error recovery procedure is
appropriate.
Allocation
Length This field contains the number of data bytes to be
returned.
Table 3-5 Request Sense Command CDB
Byte 7 6 5 4 3 2 1 0
0 Operation Code (03H)
1 Logical Unit Number
(0)
Reserved (0)
2 Reserved (0)
3 Reserved (0)
4 Allocation Length
5 Control Byte (0)