Write From Eod, Append; Writing Over Existing Data, Overwrite; Terminating Write Operations - Tandberg Data SLR7-140 PROGRAMMER Manual

Tandberg Data

30.5. Write from EOD, Append

If the WRITE command follows a LOCATE, READ, SPACE, VERIFY,
WRITE FILEMARKS or another WRITE command, and the tape is
positioned for a data append, the write operation will
start at the current tape position

30.6. Writing Over Existing Data, Overwrite

The Drive may in certain cases allow a limited possibility
for overwrite. See section 2.5 Overwrite for details

30.7. Terminating Write Operations

When writing on
properly terminated before the cartridge is suitable for
reading on the same or any other Drive. The cartridge is
suitable for reading
tapemarks) and an end-of-data marker is written to the
tape. If necessary, FILLER blocks are padded to fill up the
last frame written. For some medium types (
SLRtape7 or SLR32
Media Header information located near the BOM marker on the
loaded medium.
The following commands will force all the buffered data
(and tapemarks) and the end-of-data marker to be written to
the tape:
LOAD/UNLOAD
LOCATE
REWIND
SPACE
WRITE FILEMARKS (if IMMEDIATE bit not set)
WRITE FILEMARKS (if Number of Filemarks is zero)
If the Drive is
commands will not terminate before all data transferred
from host is written to the tape. This will reduce the
.
performance
Note:
When the Drive is in unbuffered mode the actual capacity
of a tape may
Transfer Length of the write command is small. This is
because FILLER blocks are used to fill the last frame of
all WRITE commands.
The following commands will perform a Media Header update:
LOAD/UNLOAD
REWIND
The Drive will ensure that a cartridge may not be ejected
without terminating the write operation properly. If eject
is requested (either by pressing the Eject Button or by
issuing an UNLOAD
tapemarks) and an end-of-data marker are written to the
tape. The tape is then rewound to BOT and the Media Header
is updated. Finally the cartridge is physically ejected.
30-3 Tandberg SLR Product Line SCSI Functional Specifications
.
a tape, the write
when all the
) it will also be necessary to update the
configured to
be much less than
command), the
.
operation must
buffered data
SLRtape140 to
unbuffered mode,
specified if
buffered data
Write
be
(and
WRITE
the
(and