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Command
PREVENT/ALLOW
MEDIUM REMOVAL
READ
READ BLOCK LIMITS
READ BUFFER
READ POSITION
RECEIVE DIAGNOSTICS
RESULTS
RELEASE UNIT
REQUEST SENSE
RESERVE UNIT
REWIND
SEND DIAGNOSTIC
SPACE
TEST UNIT READY
WRITE
WRITE BUFFER
WRITE FILEMARKS
VERIFY
LUN identification
Identify messages are used to identify the LUN being addressed by the initiator, and to identify
which LUN is reselecting the initiator. The old LUN field in the CDB from the SCSI-2 standards is
obsolete and should not be used (set to 0).
Bus parity or CRC errors
If the drive detects a bus parity error in a message out or command phase, it will still accept the
command, which will then return
error). Detection of a parity error during the data out phase also causes the drive to return
. Additional sense is set to 4701h (data phase CRC error detected) if the bus is in DT
CONDITION
mode or 4700h if not.
Abort Processing
The command completes.
The logical position is set to that at the start of the operation.
None
None
None
None
The command completes.
Sense data is discarded.
The command completes.
The command completes.
If data transfer is complete, the command is completed, otherwise no action
is taken
The logical position is set back to that at the start of the operation.
None
The logical position is set back to that at the start of the operation.
If data transfer is complete, the command is completed, otherwise no action
is taken.
The logical position is set back to that at the start of the operation
The logical position is set back to that at the start of the operation
(parallel SCSI only)
CHECK CONDITION
. Additional sense is 4700h (SCSI parity
CHECK
SCSI features
15
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