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SONY SDT-10000/SDT-11000 DDS Tape Drive
6. COMMAND SPECIFICATION
If the drive encounters the physical EOM when attempting a WRITE, a CHECK CONDITION status is returned.
Within the Sense data, the EOM and Valid bits are set and the Sense Key field is set to VOLUME OVERFLOW. The
Information fields contain the residue count and the Additional Sense Code and Additional Sense Code Qualifier fields
are set to EOM/P Detected. The tape is physically positioned at EOM/P.
If the Transfer Length is zero, no data will be transferred and the current position on the logical unit will not be changed.
When in Buffered Mode (see Mode Select), the drive will report a GOOD status on WRITE commands as soon as this
data block has been transferred to the data buffer.
The drive flushes its write buffer to tape and appends an EOD marker under the following conditions:
1.
Receipt of the following non-write commands:
READ
SPACE
VERIFY
READ BUFFER
WRITE BUFFER
REWIND
LOAD/UNLOAD
MODE SELECT
LOG SENSE
The buffer can be maintained through the following media commands, assuming that no other flush condition has been
met, for example, write holdoff timeout.
WRITE
WRITE FILEMARKS with Immediate bit set
ERASE
2.
Buffered Mode not selected. This causes the buffer to flush after every write type command. Buffered Mode can be
configured through MODE SELECT and if NOT used, will cause the drive will suffer a significant degradation in
performance with respect to capacity, transfer rate and, loss of streaming.
3.
The write holdoff time limit is exceeded. The default value is 5 seconds.
WRITE
Summary of Contents for DDS-4
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