HP Q153090901 1Dh, SEND DIAGNOSTIC

SEND DIAGNOSTIC 1Dh

SEND DIAGNOSTIC tells the drive to perform either its standard self-test, or diagnostics specified in the parameter list on itself. The parameter list is transferred to the drive in a series of data-out phases; each 8-byte data-out phase specifies a diagnostic to be performed by the drive. It is not an error to set Self-Test = 0 and to have a zero-length parameter list.

The test results can be retrieved with the RECEIVE DIAGNOSTIC RESULTS command.

Pre-execution checks:

Illegal Field Reservation Deferred Error Unit Attention

•If Self-Test = 0, the UntOffl bit must be set, otherwise CHECK CONDITION is reported. Sense data will be as described in Illegal Field Checks.

•If Self-Test = 1, the Parameter List Length field must be zero. Otherwise CHECK CONDITION is reported. Sense data will be as described in Illegal Field Checks.

•It is not an error to set Self-Test = 0 and to have a zero-length parameter list.

Command descriptor block:

	7		6	5	4		3	2	1	0
0					Operation		Code (1Dh)
1		Reserved (0)			PF (1)		Rsvd(0)	Self-Test	DevOffL(0)	UnitOffL
2					Reserved (0)
3	(MSB)				Parameter List Length
4										(LSB)
5						Control

CDB fields:

PF	Page Format. Specifies that the accompanying data follows the SCSI-3 Diagnostic Page
	format. It must be set to 1.
Self-Test	0 Perform the diagnostics specified in the parameter list. The UnitOffL bit must be
	set, otherwise CHECK CONDITION is reported. The drive reports status when the
	command has been completed.

1Perform the standard self-test depending on the value of UnitOffL (see above). The Parameter List Length must be 0 otherwise CHECK CONDITION is reported. The drive will report GOOD status following the pre-execution checks and before executing the command.

DevOffl	Device Offline bit. Must be cleared to zero.
UnitOffL	Unit Offline bit

0Indicates that the host is not prepared for the drive to perform tests that could affect logical position.

168 Commands