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Extended Comprehensive SMART Error Log
Table 147 defines the format of each of the sectors that comprise the Extended Comprehensive SMART error log.
Error log data structure shall not include errors attributed to the receipt of faulty commands such as command
codes not implemented by the device or requests with invalid parameters or in valid addresses.
Description
Bytes
Offset
SMART error log version
1
00h
Reserved
1
01h
Error log index (7:0)
1
02h
Error log index (15:8)
1
03h
1st error log data structure
124
04h
2nd error log data structure
124
80h
3rd error log data structure
124
FCh
4th error log data structure
124
178h
Device error count
2
1F4h
Reserved
9
1F6h
Data structure checksum
1
1FFh
512
Table 147 Extended Comprehensive SMART Error Log
Error Log Version
The value of this version shall be 01h.
Error Log Index
This indicates the error log data structure representing the most recent error. If there have been no error log entries,
it is cleared to 0. Valid values for the error log index are 0 to 4.
Extended Error Log Data Structure
An error log data structure shall be presented for each of the last four errors reported by the device.
These error log data structure entries are viewed as a circular buffer. The fifth error shall create an error log
structure that replaces the first error log data structure. The next error after that shall create an error log data
structure that replaces the second error log structure, etc.
Unused error log data structures shall be filled with zeros.
Data format of each error log structure is shown below.
Description
Bytes
Offset
1st command data structure
18
00h
2nd command data structure
18
12h
3rd command data structure
18
24h
4th command data structure
18
36h
5th command data structure
18
48h
Error data structure
34
5Ah
124
Table 148 Extended Error Log Data Structure
193
Western Digital Ultrastar DC HC310 SATA Product Manual