Quantum DLT 4000 Product Manual page 252

DLT4000 SCSI Interface
field will be set to NO SENSE. The Information Bytes will be set to the difference
(residue) between the requested transfer length and the actual block length, or in
Fixed Blocked Mode, the difference (residue) between the requested number of blocks
and the actual number of blocks read. No more than transfer length bytes are
transferred to the initiator and the tape is logically positioned after the block (EOM
side).
Filemark, End-of-Data and End-Of-Medium/partition Handling
If the drive reads a Filemark, it will return 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 media will be logically positioned after the Filemark (EOM side).
If the drive detects EOD during the READ, the drive will return a CHECK
CONDITION status. Within the Sense data, the Valid bit is set and the Sense Key
field is set to BLANK CHECK. The 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 and Additional Sense Code Qualifier fields
are set. Upon termination, the media will be physically positioned before EOD and
after the last block on tape.
The meaning of EOM is different for a read than for a write type of command. EOM
is only reported when the physical EOM/P is encountered. The drive returns a
CHECK CONDITION status. The EOM and Valid bits are set and the Sense Key is
set to MEDIUM ERROR. 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 any READ command cannot be completed successfully the drive returns a CHECK
CONDITION status. Further commands should attempt to move past the error and
complete successfully.
8-92 DLT4000/DLT4500/DLT4700 Cartridge Tape Subsystem