
Drive Error Codes
Drive Request Sense Command Values
Appendix A A-3
Drive Error Codes
Drive Request Sense Command Values
The Request Sense Command (see Table 2-6 on page 2-10) returns values
for the Sense Key and Additional Sense Code.
Drive Request Sense - Sense Key Values
Table A-1 Request Sense - Sense Key Values Byte 2, Bits 3 through 0
Sense
Key
Name Abbrev. Description
0H No Sense NS The command completed
successfully.
1H Recovered Error RE The last command was
completed successfully
with some recovery action
performed by the drive/
controller.
2H Not Ready NR The drive cannot be
accessed.
3H Medium Error ME The command terminated
with an unrecovered error
condition that was caused
by a optical disk defect.
4H Hardware Error HE The drive/controller
detected a hardware error.
5H Illegal Request IR There was an illegal
parameter in the
command descriptor block
or in the additional
parameters supplied for
some commands.
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