Hitachi HDS723020BLA642 - Execute Device Diagnostic (90 H); Table 73 Execute Device Diagnostic Command (90 H)

Hitachi hard disk drive specifications
120
11.5 Execute Device Diagnostic (90h)
Command Block Output Registers
Command Block Input Registers
Register
7
6
5
4
3
2
1
0
Register
7
6
5
4
3
2
1
0
Data
-
-
-
-
-
-
-
-
Data
-
-
-
-
-
-
-
-
Feature
-
-
-
-
-
-
-
-
Error
...See Below...
Sector Count
-
-
-
-
-
-
-
-
Sector Count
-
-
-
-
-
-
-
-
Sector Number
-
-
-
-
-
-
-
-
Sector Number
-
-
-
-
-
-
-
-
Cylinder Low
-
-
-
-
-
-
-
-
Cylinder Low
-
-
-
-
-
-
-
-
Cylinder High
-
-
-
-
-
-
-
-
Cylinder High
-
-
-
-
-
-
-
-
Device/Head
1
-
1
-
-
-
-
-
Device/Head
-
-
-
-
-
-
-
-
Command
1
0
0
1
0
0
0
0
Status
...See Below...
Error Register
Status Register
Diagnostic Code
7
6
5
4
3
2
1
0
BSY
RDY
DF
DSC
DRQ
COR
IDX
ERR
0
V
0
-
-
0
-
0
Table 73 Execute Device Diagnostic Command (90h)
The Execute Device Diagnostic command performs the internal diagnostic tests implemented by the device. The
results of the test are stored in the Error Register.
The normal Error Register bit definitions do not apply to this command. Instead, the register contains a
diagnostic code. See Table 30 Diagnostic Codes” on the page 57 for its definition.