HP 3000 Series Handbook page 172

For HP Internal Use Only
Valid. A value of 1 indicates that the Information bytes contain valid information. The exact
significance of the Information bytes depends on the status of
t~e
Sense Key field.
Error Class. Always set to 7.
Error Code. A value of 0 specifies current error; a value of 1 specifies deferred error.
Segment Number. Contains the number of the current segment descriptor when the
REQUEST SENSE command is in response to a COPY command. Otherwise, this field is set
to 0.
FM (File Mark). A value of 1 indicates the logical position is at a filemark or setmark.
EOM (End of Media). Indicates the physical position is at End Of Media. Sense Key is set to
No Sense. The Additional Sense Code is set to 04 for Beginning Of Partition or 02 for End Of
Partition. Beginning Of Partition is reported after a Space command encounters BOP. End Of
Partition is reported when a Write or Write File Marks command leaves the tape positioned in
the Early Warning region near the End Of Partition.
Note
On aDDS-formatted tape, there are two indicators toward the physical end
of the partition. EOT occurs 500 mm before the EOM mark. EOM indicate
the end of usable tape. The drive will never write data to the tape after
encountering EOM. The drive uses EOT to generate Early Warning EOP on
writes. The host may write approximately 10 megabytes of data to the tape
following the Early Warning EOP before encountering the physical EOM.
ILl (Incorrect Length Indicator). Indicates the requested block length did not match the
actual block length. Only Read and Verify may cause this bit to be set.
Sense Key. Indicates the type of error that has occurred, and the recovery action that should
be taken by the initiator. Refer to Table 5-54.
Information. These bytes are valid only if the Valid field is set to 1. They contain residue
information following the failure of a Read, Write, Write Filemarks, or Space command.
Additional Sense Length. Specifies the number of Additional Sense bytes to follow. Always
set to OB.
Command Specific Information. Normally set to 0. If, however, the Sense data is for a check
conditioned Copy command, and the Additional Sense is Copy Aborted, then the first two
bytes are set to 19 and the last two are set to 0.
Additional Sense Code and Additional Sense Code Qualifier. Provide additional information
about the cause of the Check Condition or the current tape position. Refer to Table 5-55.
Field Replaceable Unit (FRU) Code. The value of this field indicates the FRU that failed, as
follows:
5-68 Troubleshooting