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Western Digital Hard Disk Drive OEM Specification
11.23.1
General Purpose Log Directory
Table 145 defines the 512 bytes that make up the General Purpose Log Directory.
Description
Bytes
Offset
General Purpose Logging Version
2
00h
Number of sectors in the log at log address 01h (7:0)
1
02h
Number of sectors in the log at log address 01h (15:8)
1
03h
Number of sectors in the log at log address 02h (7:0)
1
04h
Number of sectors in the log at log address 02h (15:8)
1
05h
...
Number of sectors in the log at log address 20h (7:0)
1
40h
Number of sectors in the log at log address 20h (15:8)
1
41h
Number of sectors in the log at log address 21h (7:0)
1
42h
Number of sectors in the log at log address 21h (15:8)
1
43h
Number of sectors in the log at log address 22h (7:0)
1
44h
Number of sectors in the log at log address 22h (15:8)
1
45h
...
Number of sectors in the log at log address 80h (7:0)
1
100h
Number of sectors in the log at log address 80h (15:8)
1
101h
...
Number of sectors in the log at log address FFh (7:0)
1
1FEh
Number of sectors in the log at log address FFh (15:8)
1
1FFh
512
Table 145 General Purpose Log Directory
The value of the General Purpose Logging Version word shall be 0001h. A value of 0000h indicates that there is no
General Purpose Log Directory.
The logs at log addresses 80-9Fh shall each be defined as 16 sectors long.
Table 145 defines the 512 bytes that make up the General Purpose Log Directory for Serial ATA.
Byte
Log
Value
000h..01Fh
As defined in the ACS-2 standard
020h
10h
1 if Native Command Queuing is supported,
0 if Native Command Queuing is not supported
021h
10h
0
022h
11
1 if Phy Event Counters are supported
0 if Phy Event Counters are not supported
023h
11h
0
024h
12h
1 if
NCQ NON-DATA
is supported
0 if
NCQ NON-DATA
is not supported
025h
12h
0
026h
Reserved
027h
Reserved
028h
Reserved
029h
Reserved
02Ah
15h
1 if Rebuild Assist log is supported
0 if Rebuild Assist log is not supported
02Bh
15h
0
02Ch..2Fh
Reserved
030h..1FFh
As defined in the ACS-2 standard
Table 146 General Purpose Log Directory for Serial ATA