Hitachi DK23EA Specifications - Page 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. Byte 0 1 2-91 92-181 182-271 272-361 362-451 452-453 454-510 511 Table 6.13 SMART error log sector Descriptions 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. 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. K6602637 Rev.3 02.27.01 - 66 -