Hitachi DK23EB - Travelstar Series 20 GB Hard Drive Specifications page 66

(2) 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.
Byte
0
1
2-91
92-181
182-271
272-361
362-451
452-453
454-510
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.
K6602743
Rev.2
02.12.'02
Table 6.13 SMART error log sector
SMART error log version
The value of the SMART error log version is 01h.
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.
First error log data structure
Second error log data structure
Third error log data structure
Fourth error log data structure
Fifth error log data structure
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.
Reserved
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.
Descriptions
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