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100

101

SCSI Commands

5-152 Quantum DLT 4000 Tape Drive

5.23 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 5–75 SPACE Command Descriptor Block - Data Format

Table 5–76 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 7FFFFFh.

1 2 ... 247 248 249 250 251 252 253 254 255 256 257 ... 299 300

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