K6602705
Rev.3
08.20.01
- 66 -
(1) SMART Error Log Sector [Log Sector Address = 01h]
The following table defines the 512 bytes that make up the SMART error log sector. Error log data structures
includes UNC errors, IDNF errors for which the address requested was valid, servo errors, write fault errors,
etc. They do 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 invalid addresses.
Table 6.13 SMART error log sector
Byte
Descriptions
0
SMART error log version
The value of the SMART error log version is 01h.
1
Error log index
The error log index indicates the error log data structure representing the most recent
error. Only values 1 through 5 are valid.
2-91
First error log data structure
92-181
Second error log data structure
182-271
Third error log data structure
272-361
Fourth error log data structure
362-451
Fifth error log data structure
452-453
Device error count
This contains the total number of errors attributable to the device that have been
reported by the device during the life of the device. These errors include UNC errors,
IDNF errors for which the address requested was valid, servo errors, write fault errors,
etc. This count is not include errors attributed to the receipt of faulty commands such as
commands codes not implemented by the device or requests with invalid parameters or
invalid addresses. If the maximum value for this field is reached, the count remains at
the maximum value when additional errors are encountered and logged.
454-510
Reserved
511
Data structure checksum
The data structure checksum is the two's complement of the sum of the first 511 bytes
in the data structure. Each byte is added with unsigned arithmetic, and overflow is
ignored. The sum of all 512 bytes will be zero when the checksum is correct. The
checksum is placed in byte 511.
Error log data structure
An error log data structure is presented for each of the last five errors reported by the device. These error
log data structure entries are viewed as a circular buffer. That is, the first error shall create the first error
log data structure; the second error, the second error log structure; etc. The sixth error creates an error
log data structure that replaces the first error log data structure; the seventh error replaces the second
error log structure, etc. The error log pointer indicates the most recent error log structure. If fewer than
five errors have occurred, the unused error log structure entries are zero filled. The following table
describes the content of a valid error log data structure.
