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MODE SELECT (6) 15h Optional Provides a means for the initiator to
specify device parameters.
MODE SENSE
(6)/(10)
1Ah/
5Ah
Optional Provides a means for a drive to report
parameters to the initiator.
PREVENT ALLOW
MEDIUM REMOVAL
1Eh Optional Requests that the target enable or
disable the removal of the medium in
the logical unit. Medium cannot be
removed if any initiator has medium
removal prevented.
READ 08h Mandatory Requests the drive to transfer data to
the initiator.
READ BLOCK
LIMITS
05h Mandatory Requests that the logical unit’s block
length limits capability be returned
READ BUFFER 3Ch Optional Used in conjunction with the WRITE
BUFFER command as a diagnostic
function for testing target memory and
the integrity of the SCSI bus. This
command does not alter the medium.
READ POSITION 34 h Optional Reports the current position of the
logical unit and any data blocks in the
buffer.
RECEIVE DIAG
RESULTS
1Ch Optional Requests analysis data to be sent to
the initiator after completion of a SEND
DIAGNOSTIC Command.
RELEASE UNIT 17h Mandatory Used to release a previously reserved
logical unit.
REQUEST SENSE 03h Mandatory Requests the drive to
transfer sense data to
the initiator.
RESERVE UNIT 16h Mandatory Used to reserve a
logical unit.
SEND DIAGNOSTIC 1Dh Mandatory Requests the drive to perform diagnostic
operations on itself.
SPACE 11h Mandatory Provides a selection of positioning
functions (both forward and backward)
that are determined by the code and
count.
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