Table of Contents
Advertisement
SPACE
S
provides a variety of positioning functions that are determined by Code and Count fields in
PACE
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:
Illegal Field
Unit Attention
The Code field must be 0, 1 or 3. If it is not then
will be as described in the Illegal Field Checks.
Command descriptor block:
6-byte version
7
0
1
2
(MSB)
3
4
5
16-byte version
7
0
1
2–3
4
(MSB)
11
(MSB)
12
13
14
15
172
Commands
Reservation
Deferred Error
Media Access
Diagnostic Status
6
5
4
Operation Code (11h)
Reserved (0)
6
5
4
Operation Code (91h)
Reserved (0)
Reserved (0)
Parameter Length
Reserved (0)
CHECK CONDITION
3
2
Count (n)
Control
3
2
Count (n)
Control
11h
status is reported. Sense data
1
0
Code
(LSB)
1
0
Code
(LSB)
(LSB)
Advertisement
Table of Contents
