Hitachi C4K60 Specifications - Page 116

7.5.49.3. Comprehensive SMART Error Log [Log Sector Address = 02h] The last 255 errors that device reported are gathered in comprehensive SMART error log. Only 28-bit error entries contain in Comprehensive SMART error log. Following table defines the format of each of the sectors that comprise the comprehensive SMART error log. The maximum size of the comprehensive SMART error log is 51 sectors. The comprehensive SMART error log data structures include UNC errors, IDNF errors for which the address requested was valid, servo errors, write fault errors, etc. Comprehensive SMART error log data structures do not include errors attributed to the receipt of faulty commands such as command codes not supported by the device or requests with invalid parameters or invalid addresses. The error log is viewed as a circular buffer. When the last supported error log sector has been filled, the next error creates an error log data structure that replaces the first error log data structure in sector zero. The next error after that creates an error log data structure that replaces the second error log data structure in sector zero. The sixth error after the log has filled replaces the first error log data structure in sector one, and so on. Unused error log data structures are filled with zeros. The content of the error log data structure entries is defined in Table 7.31. Sector First Sector Subsequent Sector N Table 7.34 Comprehensive SMART Error Log Byte 0 1 2 - 91 92 - 181 182 - 271 272 - 361 362 - 451 452 - 453 454 - 510 511 0 - 2 2 - 91 92 -181 182 - 271 272 - 361 362 - 451 452 - 510 511 Description 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 255 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. 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 first sector. Reserved (5n + 1) Error log data structure (5n + 2) Error log data structure (5n + 3) Error log data structure (5n + 4) Error log data structure (5n + 5) Error log data structure Reserved Data structure checksum The data structure checksum is the two's complement of the sum of the first 511 bytes in the subsequent sector. K6610170 Rev.2 Dec 22, 2004 - 116 -