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Request Sense
SCSI-2 Error Code. A bit value of 0 (zero) specifies current error; a'bit value of' 1 (one)
specifies deferred error.
Error Class. This field is always equal to 7.
Valid. When set to 1, the VALID bit indicates that the Information Bytes field contains valid
information. The exact significance of the Information Bytes depends on the status of the
Sense Key field.
Segment Number. Set to zero (0). Used for Copy and Search commands; not supported in
this product.
FM (File Mark), EOM (End of Media), ILl
(In~orred
Length
Indi~ator).
All set to zero (0).
Sense Key. This field is used to indicate the type of error that has occurred, and the recovery
action that should be taken by the initiator.
It
is the primary piece of information available
to the Initiator for making decisions based on errors detected by the Target. The Sense Key
codes are:
Value (hex)
Description
0
No Sense. Indicates that there is no specific sense key infonnation to be reported for the designated
logical unit.
1
Recovered Error. Indicates that the last command completed successfully with some recovery
action performed by the Target. Details may be determinable by examining the additional sense bytes
and the information bytes.
2
Not Ready. Indicates that the logical unit addressed cannot be accessed.
3
Media Error. Indicates that the command terminated with a nonrecovered error condition that was
probably caused by a flaw in the media or an error in the recorded data.
4
Hardware Error. Indicates that the Target detected a nonrecoverable hardware failure (for example,
controller failure, device failure, parity error, etc.) while performing the command or during a self test.
S
Dlegal Request. Indicates that there was an illegal parameter in the command descriptor block or in
the additional parameters supplied as data for some commands.
6
Unit Attention. Indicates that the Target has been reset or there has been a power on.
7
Data Protect. Indicates that a command that reads or'writes the media was attempted on a block
that is protected from this operation. The read or write operation is not performed.
B
Aborted Command. Indicates that the Target aborted the command due to Initiator
request / action.
E
Miscompare. Indicates data in buffer may have been corrupted between READ BUFFER and
WRITE BUFFER commands, or a MIS COMPARE occurred during a VERIFY (with BYTCK
enabled).
Additional Sense Code. This field is specific for each sense code and provides additional
information about the cause of that particular Sense Key.
A·44 SCSI Command Descriptions
DRAFT
1/18/93 09:58
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