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SCSI Commands
Quantum DLT 8000 Tape System
5-217
SPACE Command (11h) (continued)
Table 5–99 SPACE Command Data — Field Descriptions (continued)
Field Name
Description
Count
When spacing over blocks or marks, the Count field is interpreted as
follows:
A positive value N causes forward motion over N blocks or marks. The
tape is logically positioned after the Nth block or mark on the EOM or
EOP side.
A value of 0 causes no change in logical position.
A negative value -N (two’s complement notation) causes reverse
movement over N blocks or marks. The tape is logically positioned on
the BOM or BOP side of the Nth block or mark.
When spacing to EOD, the Count field is ignored. Forward movement
occurs until the drive encounters EOD. The position is such that a
subsequent WRITE command would append data after the last object
that has been written to tape before EOD.
When executing SPACE, the tape drive implements the following hierarchy:
HIGHEST
BOM/P or EOM/P*
EOD**
Filemarks / Sequential Filemarks
LOWEST
Blocks
* Beginning of Media/Partition or End of Media/Partition
**End of Data
The tape drive supports only one partition.
Note that a “SPACE Sequential Filemarks” is a SPACE to the first occurrence of
n
filemarks written sequentially.
A SPACE command in the form “SPACE N blocks” will halt with GOOD status after
the Nth block, or with CHECK CONDITION status on any occurrence of Filemark,
EOD, BOM/P, or EOM/P. A command “SPACE N Filemarks” will halt on the Nth
Filemark with GOOD status on any occurrence of EOD, BOM/P, or EOM/P.
Depending on the size of blocks, read ahead data in the buffer allows some spacing
requests to be satisfied without actual tape movement.
Summary of Contents for DLTtape DLT 8000
Page 1: ...DLTTM 8000 Tape System Product Manual Nov 10 2003 81 60118 06...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued...
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Page 26: ...Table of Contents xxiv Quantum DLT 8000 Tape System...
Page 36: ...About This Manual Quantum DLT 8000 Tape System xxxii...
Page 54: ...General Description and Specifications 1 18 Quantum DLT 8000 Tape System...
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Page 376: ...Appendix A Definition of Vendor Unique Sense Data Information A 4 Quantum DLT 8000 Tape System...
Page 386: ...Appendix C Updating the Firmware C 6 Quantum DLT 8000 Tape System...
Page 396: ...Appendix E Visual Inspection Procedure for DLTtape Cartridges E 8 Quantum DLT 8000 Tape System...
Page 406: ...Appendix G DLT 7000 Emulation Feature G 8 Quantum DLT 8000 Tape System...
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