HP C737990900 - Manual (Page 145)

Commands 145
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SEND DIAGNOSTIC 1Dh
S END 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:
■
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:
CDB Fields:
Illegal Field Reservation Deferred Error Unit Attention
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
PF Page Format. Specifies that the accompanying data follows the SCSI-3 Diagnostic Page format.
It must be set to 1.