Optical Drive and Library SCSI-2 Command Reference

SCSI Command Overview
Drive Control Commands
Chapter 1 1-11
SCSI Command OverviewSCSI Command Overview
No Operation 08H
This message is ignored by the target.
Message Parity Error 09H
When the target receives this message, it retries the operation by
resending the original message once. If the message cannot be sent
successfully, the target immediately goes to the Bus Free Phase and
aborts the current SCSI command. No further reconnection is attempted
and no status or COMMAND COMPLETE message is returned for the
command. The target sets the Sense Key/Additional Sense Code to
Hardware Error/SCSI Interface Parity Error.
Linked Command Complete 0AH
This message is sent from the drive to an initiator to indicate the
execution of a linked command has been completed and that the status
has been sent.
Linked Command Complete (with flag) 0BH
This message is sent from the drive to an initiator to indicate the
execution of a linked command (with flag bit set to 1) has been completed
and that the status has been sent.
Bus Device Reset 0CH
This message is sent from an initiator to reset the target.
Abort Tag 0DH
The drive goes to the BUS FREE phase following successful receipt of the
ABORT TAG message and clears the current I/O process. If the drive
already started execution of the I/O process, the execution will be halted.
The medium contents may have been modified before the execution was
halted.