| 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).
Illegal Field | Reservation | Deferred Error |
Unit Attention | Media Access | Diagnostic Status |
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:
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| 7 | 6 | 5 | 4 |
| 3 | 2 | 1 | 0 |
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| 0 |
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| Operation | Code (11h) |
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| 1 |
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| Reserved (0) |
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| Code |
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| 2 | (MSB) |
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| 3 |
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| Count (n) |
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| 4 |
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| 5 |
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| Control |
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| 7 | 6 | 5 | 4 |
| 3 | 2 | 1 | 0 |
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| 0 |
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| Operation | Code (91h) |
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| 1 |
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| Reserved (0) |
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| 4 | (MSB) |
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| Count (n) |
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| 11 |
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| 12 | (MSB) |
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| Parameter Length |
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| 13 |
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| 14 |
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| Reserved (0) |
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| 15 |
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| Control |
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172 Commands