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Fixed This bit specifies whether fixed-length or variable-length blocks are to be
transferred, and gives meaning to the Transfer Length field of the READ
command.
When set to 0, variable-block mode is requested. A single block is
transferred with the Transfer Length specifying the maximum number of
bytes the initiator has allocated for the returned data.
When the Fixed bit is set to 1, the Transfer Length specifies the number
of blocks to be transferred to the initiator. This is valid only if the logical
unit is currently operating in Fixed Block mode.
When the Transfer Length is 0, no data is transferred and the current
position on the logical unit does not change. This is not an error
condition.
A successful READ with Fixed bit set to 1 transfers (current block length)
x (# of blocks x block size) bytes of data to the host. Upon termination of
READ, the medium is logically positioned after the last block of data
transferred (EOM).
Note that a READ command in fixed mode with an odd block size returns
a CHECK CONDITION: the DLT8000 tape drive does not support odd
block number transfers.
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If the tape drive reads a Filemark, it returns a CHECK CONDITION status. Within
the sense data, the Filemark and Valid bits are set and the Sense Key field is set to
NO SENSE. The information fields contain the residue count. The Additional
Sense Code and Additional Sense Code Qualifier fields are set to FILEMARK
DETECTED. Upon termination, the medium is logically positioned after the
Filemark.
If the drive detects End-of-Data (EOD) during a READ, the drive returns a
CHECK CONDITION status. Within the sense data, the Valid bit is set and the
Sense Key field is set to BLANK CHECK. The End-of-Medium (EOM) bit may be
set if the drive determines that the tape is positioned past the PSEN marker. The
information fields contain the residue count. The Additional Sense Code Qualifier
fields are set. Upon termination, the medium is physically positioned before EOD
and after the last block on tape.