Tandberg Data SLR7-140 PROGRAMMER, Руководство пользователя

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32-1 Tandberg SLR Product Line SCSI Functional Specifications
32.
Write Filemarks
32.1. Command Description
The WRITE FILEMARKS command causes the specified number
of tapemarks to be written beginning at the current tape
position. A zero value of tapemarks indicates that no
tapemarks are to be written. This can be used to force
any buffered write data or tapemarks to be written to
the tape.
If the WRITE FILEMARKS command is the first media access
command executed on a newly inserted cartridge, the
write operation will start from BOM. If the WRITE
FILEMARKS command follows an ERASE, LOAD/UNLOAD (with
Load bit set to one) or REWIND command, the write
operation will also start from BOM. If the WRITE
FILEMARKS command follows a READ, SPACE, WRITE or
another WRITE FILEMARKS command, and the tape is in an
append position, the write filemark operation will start
at the current tape position.
Upon termination of a successful WRITE FILEMARKS
command, the logical tape position will be after the
last tapemark written (end-of-partition side).
See also the WRITE command for details on terminating
write operations.
If disconnection is allowed, the Drive will disconnect
when executing this command.
32.2. Command Descriptor Block
BYTE BIT 7 6 5 4 3 2 1 0
00 Operation Code 10h
01 Logical Unit Number (LUN) RESERVED WSmk IMM
02 Number of Tapemarks
03
04
05 Control Byte
Table 32-1: WRITE FILEMARKS Command Descriptor Block
WSmk
A Write Setmark (WSmk) bit of one indicates that the
Write Filemarks command should write the requested
number of setmarks. A Write Setmark (WSmk) bit of zero
indicates that the Write Filemarks command should write
the requested number of filemarks.