Quantum DLTtape DLT 7000, Product Manual

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SCSI Commands
Quantum DLT 7000 Tape System 5-163
5.22 SPACE COMMAND (11h)
The SPACE command provides a variety of positioning functions that are
determined by Code and Count fields in the Command Descriptor Block. Both
forward (toward End of Medium/End of Partition) and reverse (toward
Beginning of Medium/Beginning of Partition) positioning are provided.
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (11h)
1 Logical Unit Number Reserved Code
2 - 4
(MSB)
Count
(LSB)
5 Unused Reserved Flag Link
Figure 5–78 SPACE Command Descriptor Block - Data Format
Table 5–80 SPACE Command Data - Field Descriptions
Field Name Description
Code The code can be one of the following:
Space Code Space by:
000b Blocks
001b Filemarks
010b Sequential Filemarks
011b End of Data
For 2.6 GB and 6.0 GB format, the tape drive supports count values 0, 1, and 2 only.
For 10.0 GB and newer formats, compressed or noncompressed, the count value
can be from 0 to FFFFFFh.