Reference Guide

Chapter 4 SCSI Commands
REQUEST SENSE Command (03h)
DLT-S4 Interface Reference Guide 309
Table 173 Supported Sense
Keys for REQUEST SENSE
Command
Field Pointer If the Sense Key is ILLEGAL REQUEST, this field indicates which byte of the CDB or
Parameter List is in error. For a multi-byte field, the most significant byte is
indicated.
If the Sense Key is
NO SENSE and the Additional Sense Code field is OPERATION IN
PROGRESS
, this field indicates the progress toward completion as the numerator of
a fraction with 65,536 as the denominator.
Internal Status
Code
Vendor specific.
Tape Motion
Hours
Reports the number of tape motion (head wear) hours. Format is given as a
hexadecimal word (2 bytes).
Power On Hours Reports the total number of hours that drive power has been applied over the
drive’s lifetime. Format is given as a hexadecimal longword (4 bytes).
Tape Remaining Reports the amount of tape remaining in 4 KB (4096 bytes) blocks.
Sense Key Description
0h
NO SENSE. Check the Filemark, EOM, ILI, Additional Sense Code, and Additional Sense
Code Qualifier fields.
1h
RECOVERED ERROR. Can result from rounding of Mode Parameters on a MODE SELECT
command or may report that
READ / WRITE error rates are reaching drive specification
limits for optimal operation. The drive may still be able to continue to function without
any unrecovered errors for a long period of time, however. The drive generates a
CHECK
CONDITION
status only if the PER field of Mode Page 01h is set to 1.
2h
NOT READY. The tape medium is not ready for tape operation commands. The tape
medium might not be present in the drive or may be in the process of loading or
calibrating.
3h
MEDIUM ERROR. An unrecoverable WRITE, READ, or positioning error occurred. Detailed
device-specific information may be available.
4h
HARDWARE ERROR. The Additional Sense Code / Additional Sense Code Qualifier fields
may present more specific information.
Field Description