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Commands172
SPACE 11h
SPACE provides a variety of positioning functions that are determined by Code and Count fields in
the Command Descriptor Block. Both forward (towards EOM) and reverse (towards BOM)
positioning are provided.
Any unwritten data in the buffer is flushed to tape before the space is started. The logical media
position is then modified according to the Code and Count fields. Once the space has started, it
will complete even if the SCSI operation is aborted for some reason (for example, the host selects
and sends an abort message).
Pre-execution checks:
The Code field must be 0, 1 or 3. If it is not then CHECK CONDITION status is reported. Sense data
will be as described in the Illegal Field Checks.
Command descriptor block:
6-byte version
16-byte version
Illegal Field Reservation Deferred Error
Unit Attention Media Access Diagnostic Status
7 6 5 4 3 2 1 0
0 Operation Code (11h)
1 Reserved (0) Code
2 (MSB)
Count (n)
3
4 (LSB)
5 Control
7 6 5 4 3 2 1 0
0 Operation Code (91h)
1 Reserved (0) Code
2–3 Reserved (0)
4 (MSB)
Count (n)
11 (LSB)
12 (MSB)
Parameter Length
13 (LSB)
14 Reserved (0)
15 Control