B.2 Sense key
The sense keys in the lower-order bits of byte 2 of the sense data returned
by the Request Sense command are described in the following table. You
can find a more detailed description of the error by checking the additional
sense code and the additional sense code qualifier in Section B.3.
Sense key
Description
0
H
No Sense. In the case of a successful command, no
specific sense key information needs to be reported for
the drive.
1
H
Recovered error. The drive completed the last
command successfully with some recovery action.
When many recovered errors occur during one
command, the drive determines which error it will
report.
2
H
Not ready. The addressed logical unit cannot be
accessed. Operator intervention may be required to
correct this condition.
3
H
Medium error. The command was terminated with a
nonrecoverable error condition, probably caused by a
flaw in the media or an error in the recorded data.
4
H
Hardware error. The drive detected a nonrecoverable
hardware failure while performing the command or
during a self-test. This includes, for example, SCSI
interface parity errors, controller failures and device
failures.
5
H
Illegal request. An illegal parameter in the command
descriptor block or in the additional parameters
supplied as data for some commands (for example, the
Format Unit command, the Mode Select command and
others). If the drive detects an invalid parameter in the
command descriptor block, it terminates the command
without altering the media. If the drive detects an
invalid parameter in the additional parameters supplied
as data, the drive may have already altered the media.
6
H
Unit attention. The drive may have been reset. See
the
Seagate SCSI-2 Interface Manual, publication
number 77765466, for more details about the Unit
Attention condition.
B
H
Aborted command. The drive aborted the command.
The initiator may be able to recover by retrying.
E
H
Miscompare. The source data did not match the data
read from the media.
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