User's Guide

Chapter 3 Emulated DLT7000 SCSI Commands
Request Sense (03h)
Quantum DX-Series Software Interface Guide 247
Request Sense (03h) 3
The REQUEST SENSE command causes the tape drive to transfer
detailed sense data to the initiator.
Table 199 REQUEST
SENSE Command
Descriptor Block -
Data Format
Bit/Byte 7 6 5 4 3 2 1 0
0
1
2-3
4
5
Table 200 REQUEST
SENSE Command
Data - Field
Descriptions
The REQUEST SENSE command causes the tape drive to transfer
detailed sense data to the initiator.
The sense data is valid for a CHECK CONDITION or RESERVATION
CONFLICT status returned on the previous command. The sense data
bytes are preserved by the tape drive until 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 tape 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. The
positional information provided reflects the logical position of the tape
Operation Code (03h)
Logical Unit Number Reserved
Reserved
Allocation Length
Unused Reserved Flag (0)Link (0)
Field Name Description
Allocation
Length
This field specifies the maximum number of sense
bytes to be returned. The tape drive terminates the
transfer when this number of bytes has been
transferred or when all available sense data has
been transferred to the host, whichever is less.