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11.23 Read Log Ext (2Fh)
Com m and Block Output Registers
Register
Data Low
Data High
Current
Feature
Previous
Current
Sector Count
Previous
Current
Sector Number
Previous
Current
Cylinder Low
Previous
Current
Cylinder High
Previous
Device/Head
Command
Error Register
7
6
5
4
CRC
UNC
0
IDN
0
V
0
V
Table 142 Read Log Ext Command (2Fh)
This command returns the specified log to the host. The device shall interrupt for each DRQ block transferred.
Output Parameters To The Device
Feature
Sector Count Current
Sector Count Previous
Sector Number Current
Cylinder Low Current
Cylinder Low Previous
7
6
5
4
3
2
-
-
-
-
-
-
-
-
-
-
-
-
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
-
-
-
-
-
-
V
V
V
V
V
V
V
V
V
V
V
V
-
-
-
-
-
-
-
-
-
-
-
-
1
-
1
D
-
-
0
0
1
0
1
1
3
2
1
0
ABT
T0N
AMN
0
V
0
Log Address Specific
The number of sectors to be read from the specified log low order, bits (7:0).
The log transferred by the drive shall start at the sector in the specified log at the
specified offset, regardless of the sector count requested.
The number of sectors to be read from the specified log high orders , bits (15:8).
The log to be returned as described in Table 143.
The first sector of the log to be read low order, bits (7:0).
The first sector of the log to be read high order, bits (15:8).
Western Digital Hard Disk Drive OEM Specification
Com m and Block Input Registers
1
0
Register
-
-
Data Low
-
-
Data High
V
V
Error
V
V
V
V
Sector Count
V
V
V
V
Sector Number
-
-
V
V
Cylinder Low
V
V
-
-
Cylinder High
-
-
-
-
Device/Head
1
1
Status
0
7
6
5
BSY
RDY
DF
0
0
V
0
174
7
6
5
4
3
-
-
-
-
-
-
-
-
-
-
...See Below ...
HOB=0
-
-
-
-
-
HOB=1
-
-
-
-
-
HOB=0
-
-
-
-
-
HOB=1
-
-
-
-
-
HOB=0
-
-
-
-
-
HOB=1
-
-
-
-
-
HOB=0
-
-
-
-
-
HOB=1
-
-
-
-
-
-
-
-
-
-
...See Below ...
Status Register
4
3
2
1
DSC
DRQ
COR
IDX
V
-
0
2
1
0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0
ERR
-
V
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