DLT1/VS80 SCSI Interface Guide
81-81276-01 Rev A01
July 2004
4-99
Table 4-59.
REQUEST SENSE Data — Field Descriptions
Field Name
Description
Valid
When set to 1, this field indicates that the information bytes contain valid
information as defined in the SCSI specification.
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 is not a result of the current command.
No other values are returned.
Segment Number
This field is always 0.
Filemark
This bit indicates that the current command has read a Filemark.
EOM
End of Medium. 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 operations, the tape 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 are set. For READ operations, the tape
drive does not return a CHECK CONDITION until the tape drive encounters the
physical EOM.
ILI
Incorrect Length Indicator. This bit indicates that the requested logical block
length did not match the logical block length of the data on the medium. Only
Read or Verify can set this bit.
Sense Key
In most cases, Additional Sense Code and/or Qualifier information is available.
See
Table 4-66 on page 4-114
.
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.
Additional Sense
Length
Specifies the number of additional sense bytes to follow. If the Allocation Length
of the CDB is too small to transfer all of the additional sense bytes, the Additional
Sense Length is not adjusted to reflect the truncation.
Command Specific
Information Bytes
Command Specific Information Bytes are handled as device specific and can be
logged by the operating system on error conditions. On media errors, these bytes
usually contain the current SCSI Logical Block Address.
Additional Sense Code
(ASC) and ASC
Qualifier (ASCQ)
These two bytes provide additional information about the Sense Key and the cause
of the CHECK CONDITION status. See
Table 4-67 on page 4-114
.
Sub-Assembly Code
Unsupported, always returns 0.
Содержание DLT1/VS80 SCSI
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