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8.34 SEND DIAGNOSTIC (1Dh)
Byte
7
0
1
Function Code
2
3
(MSB)
4
5
VU = 0
Figure 157. SEND DIAGNOSTIC
The SEND DIAGNOSTIC command requests the drive to perform its self-diagnostic test or to perform a
function based on a page of information sent in a Data Out phase during the command.
! PF (Page Format) bit set to one indicates the data sent by the Initiator conforms to the page structure
as specified in SCSI-2 standard. This bit must be set to one if the SlfTst bit is set to zero. This bit is
ignored by the drive if the SlfTst bit is set.
! SlfTst set to one indicates that the device performs its internal self test. If SlfTst is one, Function
code field is ignored. If SlfTst is set to zero, the content of Function code is specified in Function code
field values.
Bit
6
5
4
Command Code = 1Dh
PF
RSVD=0
Reserved = 0
Parameter List Length
Reserved = 0
Ultrastar 146Z10 hard disk drive specifications
3
2
1
SlfTst
Dev0fl
Unt0fl
(LSB)
FLAG
157
0
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