HP C737990900 - Manual (Page 44)

44 Commands
INQUIRY 12h
I NQUIRY 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 Reserved (0)
4 Allocation Length
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.