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 The old LUN field in the CDB from the SCSI-2 standards is
obsolete and should not be used (set to 0).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