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The INQUIRY command allows the initiator to determine the kind of SCSI devices
attached to its SCSI bus. It causes a device that is attached to a SCSI bus to return
information about itself. The drive identifies itself as a Direct Access Storage
Device that implements the applicable interfacing protocol. The drive does not
need to access its storage medium to respond to the inquiry.
The drive can provide two categories of data in response to an INQUIRY
command: Standard Inquiry Data and Vital Product Data. Standard Inquiry Data
contains basic data about the drive, and Vital Product Data comprises several
pages of additional data. Each Vital Product Data page requires a separate
INQUIRY command from the initiator.
An INQUIRY command is not affected by, nor does it clear, a Unit Attention
condition.
Bit
Byte
765 4 3210
0 Operation Code (12h)
1 Reserved CmdDt EVPD
2 Page Code or Operation Code
3 Reserved
4 Allocation Length
5 Unused Reserved Flag Link
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