360050398

10.8.42.6.2.5 Device error count

The device error count field will contain the total number of errors attributable to the device that have been reported by the device during the life of the device. These errors will include UNC errors, IDNF errors for which the address requested was valid, servo errors, write fault errors, etc. This count will 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 will remain at the maximum value when additional errors are encountered and logged.

10.8.42.6.2.6 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 will be added with unsigned arithmetic, and overflow will be ignored. The sum of all 512 bytes will be zero when the checksum is correct. The checksum is placed in byte 511.

10.8.42.6.3 Comprehensive error log

The following defines the format of each of the sectors that comprise the SMART comprehensive error log. The SMART Comprehensive error log provides logging for 28-bit addressing only. For 48-bit addressing see

10.8.43.2. The size of the SMART comprehensive error log is 51 sectors. All multi-byte fields shown in this structure follow the byte ordering described in 10.8.42.6.2.3 and 10.8.42.6.2.4. The comprehensive error log data structures shall include UNC errors, IDNF errors for which the address requested was valid, servo errors, write fault errors, etc. Comprehensive error log data structures shall 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.

Comprehensive error log

Byte

First sector

Subsequent sectors

0

SMART error log version

Reserved

1

Error log index

Reserved

2-91

First error log data structure

Data structure 5n+1

92-181

Second error log data structure

Data structure 5n+2

182-271

Third error log data structure

Data structure 5n+3

272-361

Fourth error log data structure

Data structure 5n+4

362-451

Fifth error log data structure

Data structure 5n+5

452-453

Device error count

Reserved

454-510

Reserved

Reserved

511

Data structure checksum

Data structure checksum

n is the sector number within the log. The first sector is sector zero

10.8.42.6.3.1 Error log version

The value of the error log version byte shall be set to 01h.

10.8.42.6.3.2 Error log index

The error log index indicates the error log data structure representing the most recent error. If there have been no error log entries, the error log index is set to zero. Valid values for the error log index are zero to 255.

10.8.42.6.3.3 Error log data structure

The error log is viewed as a circular buffer. The device may support from two to 51 error log sectors. When the last supported error log sector has been filled, the next error shall create an error log data structure that replaces the first error log data structure in sector zero. The next error after that shall create an error log data structure that replaces the second error log data structure in sector zero. The sixth error after the log has filled shall replace the first error log data structure in sector one, and so on.

The error log index indicates the most recent error log data structure. Unused error log data structures shall be filled with zeros.

The content of the error log data structure entries is defined in 10.8.42.6.2.2.

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