Quantum DLT 4700, Product Manual

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DLT4000 SCSI Interface
8-104 DLT4000/DLT4500/DLT4700 Cartridge Tape Subsystem
Error-Code
A value of 70h indicates a current error – the report is associated with the most
recently received command.
A value of 71h indicates a deferred error – the report is associated with a previous
command and not as a result of the current command.
No other values will be returned.
Segment Number
This byte is always zero.
Filemark
This bit indicates that the current command has read a Filemark.
EOM
This bit indicates that an End-of Medium condition (End of Partition or Beginning of
Partition) exists. The warning is also given by setting the Sense Key to NO SENSE
and the Additional Sense Code Qualifier to End of Partition or Beginning of Partition.
For write-type operations, the drive returns a CHECK CONDITION on any operation
which occurs after detection of the Early Warning EOP marker. The EOM and
Additional Sense Code fields will be set. For read-type operations, the drive does not
return a CHECK CONDITION until the drive encounters the physical EOP.
ILI
The Incorrect Length Indicator bit indicates that the requested logical block length did
not match the logical block length of the data on the tape. Only Read or Verify may
cause this bit to be set.
Sense Key
In most cases, Additional Sense Code and/or Qualifier information is available. See
the tables later in this section.
Information Bytes
These bytes contain the differences (residue) of the requested length minus the actual
length in bytes, blocks, or Filemarks, as determined by the command. Negative values
are indicated by two's complement notation. The bytes are valid for all read, write,
space, and verify tape commands for which a CHECK CONDITION status has been
generated. The information bytes are zero for MODE SELECT/SENSE, INQUIRY,
READ BLOCK LIMITS, and TEST UNIT READY.