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Fixed The fixed bit specifies both the meaning of the Transfer Length field
and whether fixed-length or variable-length blocks are to be
transferred.
When the Fixed bit is 0, Variable-length block mode is selected. A
single block is transferred from the initiator and is written to the
logical unit beginning at the current logical tape position. Upon
successful termination, the tape is logically positioned after this
block (on the Enod of Media/Partition, or EOM/P side). The Transfer
Length specifies the number of bytes that the drive handshakes out
from the initiator as one block.
When the Fixed bit is 1, the Transfer Length field specifies the
number of blocks to be transferred to the host beginning at the
current tape position. This form of WRITE is valid only if the logical
unit is currently operating in the Fixed Block mode – when it has
been instructed to use fixed-length blocks with MODE SELECT. The
current block length is the block length defined in the MODE
SELECT command. Upon termination, the tape is logically
positioned after these blocks.
Transfer Length This field contains the length of the data transfer in bytes or blocks
depending on whether Fixed or Variable block mode is selected.
When the Transfer Length is 0, no data is transferred and the
current position on the logical unit is not changed.
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If End of Tape (EOT) is detected while writing, the tape drive finishes writing any
buffered data. The command terminates with CHECK CONDITION status. Within
the sense data, the EOM bit is set, the Sense Key is set to NO SENSE, and the
Additional Sense code and Additional Sense Code Qualifier fields are set to
EOM/P detected. The drive attempts to complete any subsequent writes, returning
a CHECK CONDITION status in each case.