Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
254
18.40
SEND DIAGNOSTIC (1D)
Table 234 SEND DIAGNOSTIC (1D)
Byte
Bit
7
6
5
4
3
2
1
0
0
Command Code = 1Dh
1
Function Code
PF
RSVD =0
SlfTst
Dev0fl
Unt0fl
2
Reserved = 0
3-4
(MSB)
Parameter List Length
(LSB)
5
VU = 0
Reserved = 0
FLAG
LINK
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 conform to the page structure as
specified in SCSI standard. This bit is ignored by the Target if the SlfTst bit is set.
- SlfTst set to one indicates that the device performs its default self-test. If SlfTst is one, the Function code field is
ignored. If SlfTst is set to zero, the action to perform is specified in Function code field.