Maxtor 10K III manual Operation Code 12h Reserved CmdDt, Evpd, Code or Operation Code

SCSI Description

￿￿￿￿+037+4;The INQUIRY￿%QOOCPFcommand￿￿￿￿Jallows￿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 INQUIRY commands are described in Table 5-22and Table 5-23.

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.

INQUIRY Command Descriptor Block-Data Format

	Operation Code (12h)
1	Reserved		CmdDt	EVPD
2	Page Code or Operation Code
3		Reserved
4		Allocation Length
5		Control

$[VG$KV		￿			INQUIRY￿	Command￿	Descriptor￿	Block￿-Field Descriptions￿	￿	￿
				Command Support Data. If CmdDt = 0 and EVPD (see below) = 0, the drive
CmdDt(KGNF				returns the Standard Inquiry Data&GUETKRVKQP. If CmdDt = 1 with EVPD = 0, the drive
				returns the Command Data specified by Page Code/Operation.
	Table			Enable Vital Product Data. If EVPD = 0 and CmdDt (see above) = 0, the drive
EVPD				returns the Standard Inquiry Data. If EVPD = 1and CmdDt = 0, the drive re-
				turns the Vital Product Data Page specified by Page Code/Operation Code.
			5-22
				Specifies the Vital Product Data Page or Command Support Data which is to
				be returned by the drive when EVPD is set. Specifies the SCSI Operation Code
Page Code or				for command support data to be returned by the drive when CmdDt is set. A
				CHECK CONDITION status is returned if this field specifies an unsupported
Operation Code
				Page or Operation Code or if both EVPD and CmdDt are set. Table 5-27lists
				the Page Codes for the Vital Product Pages supported by the drive. Table 5-
				41 lists the operation codes for the CmdDt information supported by the
				drive.
				Specifies the number of bytes of inquiry information the drive is allowed to
Allocation Length				return to the initiator during the command's data-in buffer transfer. Error sta-
				tus is not returned if the value in this field truncates the requested informa-
	Table5
			-23tion.

5-20 Maxtor Atlas 10K III