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Sense Keys
TABLE 3-146
Sense Key, with the ASC and ASCQ, provides a description about an error.
TABLE 3-146 Sense Key Code Descriptions
Code
Description
0
No Sense
Indicates there is no specific sense key information to be reported. A sense key of 0
indicates a successful command or a command that received a Check Condition status
because of a filemark, end-of-medium, or illegal length indication. A sense key of 0 also
indicates the tape drive needs cleaning.
2
Not Ready
Indicates the addressed logical unit is not ready for tape motion commands (tape is not
loaded, device is not ready).
3
Medium Error
Indicates an unrecovered error condition that was probably caused by a defect in the tape
or an error in the recorded data. This sense key may also be returned if the device cannot
distinguish between a defect in the tape and/or a hardware failure, Sense Key 4.
4
Hardware Error
Indicates the device detected an unrecoverable hardware failure while performing the
command or during a self-test.
5
Illegal Request
Indicates an illegal parameter in the Command Descriptor Block or parameter data.
6
Unit Attention
Indicates a tape may have been changed, the device was reset, or parameters were
changed by another host.
7
Data Protect
Indicates a command that reads or writes to the tape was attempted on a block that is
protected from this operation. The read or write operation was not performed.
8
Blank Check
Indicates the device encountered blank tape.
B
Aborted Command
Indicates the device aborted the command. The initiator may be able to recover by trying
the command again.
D
Volume Overflow
Indicates a buffered device has reached the end-of-tape and data remains in the buffer.
E
Miscompare
Indicates that the source data did not match the read data from the medium
(Logical Block Protection Methods did not agree).
August 2016
lists the Sense Keys that provides basic information about an error. The
Request Sense Command
Commands 193
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