Quantum LTO 4, Руководство пользователя

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SCSI Commands: 42BREWIND Page 182
3.30 REWIND
The REWIND command requests that the medium be positioned to the Beginning Of
Tape (BOM). Prior to performing the rewind operation, the buffered data and
filemarks are written to the tape and an EOD marker is recorded. The rewind
operation is done at high speed.
3.30.1 REWIND Command Descriptor Block
Byte Bits
7 6 5 4 3 2 1 0
0 Operation Code (01h)
1 Ignored LUN Reserved IMMED
2 Reserved
3 Reserved
4 Reserved
5 Control
3.30.1.1 REWIND Command Field Descriptions
Field Bytes Bits Description
Operation
Code 0 The Operation code for REWIND is 01h.
Ignored
Logical
Unit 1 5-7 The LUN field is vestigial from the SCSI-1 standard and is
ignored.
IMMED 1 0 Immediate bit:
0 = Status is not returned until the rewind operation has
completed.
1 = Status is returned as soon as all buffered data and filemarks
have been written to the medium and the REWIND CDB has
been validated.
Reserved All reserved bits must be 0.
Control 5 See SCSI Command Control Byte Format on page 25.
If Check Condition status is returned from REWIND command with the IMMED bit
set to one, then the rewind operation is not performed.
3.30.2 REWIND Completion Status
Code Message Description
00h Good
Status
•
The drive is ready to perform any appropriate command.
•
The drive remains in any previously set mode.
•
The tape position is BOM (if not an immediate command).
Note: If IMMED is one, then Good Status only indicates that all buffered data
and filemarks have been written to the medium and that the REWIND CDB is
valid.