
SDLT 220 and SDLT 320 Product Manual CHAPTER 6: SCSI Description
81-85002-01 March 2004 6-3
6.2 SCSI-2 Commands
ANSI classifies SCSI commands as mandatory, optional, or vendor-specific.
The mandatory and optional SCSI-2 commands implemented for the drives are
summarized in Table 6-1.
Table 6-1. Implemented ANSI SCSI-2 Commands
Command Code Class Description
ERASE 19h Mandatory Causes part or all of the tape medium to be
erased, beginning at the current position on the
logical unit.
INQUIRY 12h Mandatory Requests that information be sent to the initiator.
LOAD UNLOAD 1Bh Optional Causes tape to move from not ready to ready.
Prior to performing the load unload, the target
ensures that all data, filemarks, and/or setmarks
shall have transferred to the tape medium.
LOCATE 2Bh Optional Causes the target to position the logical unit to
the specified block address in a specified
partition. When complete, the logical position is
before the specified position.
LOG SELECT 4Ch Optional Provides a means for the initiator to manage
statistical information maintained by the drive
about the drive. This standard defines the format
of the log pages but does not define the exact
conditions and events that are logged.
LOG SENSE 4Dh Optional Provides a means for the initiator to retrieve
statistical information maintained by the drive
about the drive.
MODE SELECT (6)/(10) 15h/
55h
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.
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