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INQUIRY 12h
Commands
39
INQUIRY 12h
INQUIRY tells the drive to return information about the basic operating parameters to the host.
These parameters cannot be changed. The drive returns Inquiry data to the host in a data-in
phase.
NOTE: This command is immune from most of the pre-execution checks that other commands
must pass (for example, it can be executed while the unit is reserved for another host). U
nit
attention and deferred error conditions are preserved and reported on subsequent commands.
Pre-execution checks:
Only the Illegal Field Check is performed before the command is executed.
If the EVPD bit is clear, the page code must be zero, otherwise
illegal request is reported.
If the EVPD bit is set, the page code must be one of the supported page codes for Inquiry data.
Otherwise
illegal request is reported.
Command descriptor block:
CDB fields:
7 6 5 4 3 2 1 0
0 Operation Code (12h)
1 LUN Reserved (0) EVPD
2 Page Code
3
Allocation Length
4
5 Control
LUN This field is ignored.
EVPD Enable Vital Product Data
0
1
Normal inquiry data is returned.
A page of vital product data is returned.