Sony DDS-4 Product Description Manual page 108

6. COMMAND SPECIFICATION
If the Fixed bit is set to zero, the Information bytes are set to the difference (residue) between the requested Transfer
Length and the actual number of bytes read. Filemarks and Save-Set Marks are considered to have a byte count of zero,
though this does not cause the ILI bit to be set.
MEDIUM ERROR :
The current record being read or a previously acknowledged WRITE type of operation experienced an error prob-
ably related to the condition of the tape, or the cleanliness of the head.
HARDWARE ERROR :
Either a previously acknowledged WRITE type of operation had a major non-media related failure or the read itself
experienced the failure. The Valid bit is set, and the Information field contains the appropriate residue. The mean-
ing of EOM is different in a READ command from that in a WRITE type of command. EOM is only reported on
physical end-of-media. However, this condition is indistinguishable from other fatal servo errors and so is reported
as a HARDWARE ERROR.
BLANK CHECK:
If EOD (End-of-Data) was encountered during a read, the sense key is BLANK CHECK, the Valid bit is set and the
Information bytes contain the residue count.
SONY SDT-10000/SDT-11000 DDS Tape Drive
READ
6 - 57