Invalid value in SERVICE ACTION field

Douglas Gilbert dgilbert at
Mon Apr 28 15:28:17 PDT 2014

* From the T10 Reflector (t10 at, posted by:
* Douglas Gilbert <dgilbert at>
Irrespective of what SPC-4 says, from the point of view
of an OS or user space tools, this is just a mess.
I'd reckon about 80% of devices get the illogical "right"
answer (invalid field in cdb), 15% get the logical "wrong"
answer, and as for the rest well that depends on which
command you send :-)
A suggestion: for SPC-5 deprecate INVALID COMMAND OPERATION
CODE and the use of INVALID FIELD IN CDB for service actions.
Then introduce a new additional sense for both cases: for
Doug Gilbert
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