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12.55.3.5 Data Structure Checksum
The Data Structure Checksum is the 2’s compliment of the result of a simple 8-bit addition of the first 511 bytes in the
data structure.
12.55.4
SMART Log Directory
The SMART Log Directory is SMART Log Address zero and is defined as one sector, 512 bytes, long.
Table 234 SMART Log Directory
Description
Bytes
Offset
SMART Logging Version
2
00h
Number of sectors in the log at log address 1
1
02h
Reserved
1
03h
Number of sectors in the log at log address 2
1
04h
Reserved
1
05h
…
…
…
Number of sectors in the log at log address 255
1
1Feh
Reserved
1
1FFh
512
The value of the SMART Logging Version word shall be 01h. The logs at log addresses 80-9Fh shall each be defined
as 16 sectors long.
12.55.4.1 SMART summary error log sector
The following defines the 512 bytes that make up the SMART summary error log sector. All multi-byte fields shown
in this data structure follow the ATA/ATAPI-7 specifications for byte ordering.
Table 235 SMART summary error log sector
Description
Bytes
Offset
SMART error log version
1
00h
Error log index
1
01h
1st error log data structure
90
02h
2nd error log data structure
90
5Ch
3rd error log data structure
90
B6h
4th error log data structure
90
110h
5th error log data structure
90
16Ah
Device error count
2
1C4h
Reserved
57
1C6h
Data structure checksum
1
1FFh
512
12.55.4.2 SMART error log version
This value is set to 01h.
12.55.4.3 Error log index
This points the most recent error log data structure. Only values 1 through 5 are valid.
317
Hard Disk Drive Specification