SCSI Commands

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

 

7

 

6

 

5

4

 

3

2

 

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

Operation Code (11h)

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

Logical Unit Number

Reserved

 

 

 

Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(MSB)

 

 

 

 

 

 

 

 

 

 

2 - 4

 

 

 

 

 

 

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.

Quantum DLT 7000 Tape System

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Image 267
Quantum Instruments DLT 7000 manual Space Command 11h, Lsb
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