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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
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