CHAPTER 6: SCSI Description
SDLT 220 and SDLT 320 Product Manual
6-4
March 2004
81-85002-01
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
34h
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.
TEST UNIT READY
00h
Mandatory
Provides a means to check if the logical unit is
ready.
VERIFY
2Fh
Optional
Requests the drive to verify the data written to
the medium.
WRITE
0Ah
Mandatory
Requests the drive to write data transferred from
the initiator to the medium.
WRITE BUFFER
3Bh
Optional
Used in conjunction with the READ BUFFER
command as a diagnostic for testing target
memory and the integrity of the SCSI bus.
WRITE FILEMARKS
10h
Mandatory
Requests that the target write the specified
number of filemarks or setmarks to the current
position on the logical unit.
Table 6-1.
Implemented ANSI SCSI-2 Commands (Continued)
Command
Code
Class
Description
Summary of Contents for DLTtape SDLT 220
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