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Commands108
Read specific status:
NOTE: Early warning end of medium information is not reported on reads.
Residue information:
The Valid bit will be set. The information bytes will be as follows:
Event Status Key Notes
SILI error CHECK
COND’N
NO
SENSE
ILI and Valid bits are set. The information bytes will be set
as follows:
Variable Block Mode: The difference between the
requested Transfer Length and the actual block size. If the
block size is bigger than the Transfer Length, this will be
negative (twos complement).
Fixed Block Mode: The difference between the requested
number of records and the number of whole good records
transferred. If the last record was under length, it is
considered “whole good” for the purposes of this
calculation.
Filemark
encountered during
a read
CHECK
COND’N
NO
SENSE
The Mark bit is set. Logical position will be on the EOM
side of the filemark. Additional sense is 0001h (filemark
detected). The logical position will be on the EOM side of
the filemark. Residue information is as described below.
EOD encountered
during a read
CHECK
COND’N
BLANK
CHECK
Additional sense is set to 0005h (EOD detected). Residue
information is as described below.
EOP/M
encountered during
a read
CHECK
COND’N
MEDIUM
ERROR
The EOM bit is set. Additional sense is set to 0002h (EOP/
M detected). Residue information is as described below.
Failure to read data
through media error
or non-fatal drive
error
CHECK
COND’N
MEDIUM
ERROR
Additional sense is set to 1100h (unrecovered read error)
or 3B00h (sequential positioning error). Residue
information is as described below.
Corrupt data format CHECK
COND’N
MEDIUM
ERROR
Additional sense set to 3002h (can’t read media).
Blank media
encountered during
a read
CHECK
COND’N
BLANK
CHECK
Caused by an attempt to read an unformatted tape.
Additional sense is set to 5000h (EOD not found). Residue
information is as shown below.
Variable Block Mode The requested transfer length (in bytes).
Fixed Block Mode The difference (in blocks) between the requested transfer size and the actual
number of blocks transferred. A partially transferred block is not counted, so for
example, if 3.5 out of 10 blocks have been transferred the residue will be 7.
If the last block is an illegal length block, it is not counted among those transferred.
For example, if 4 legal length blocks and 1 illegal length block have been
transferred out of a total of 10, the residue will be 6.