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Interface
5-72 C141-E104-02EN
• Check sum
Two’s complement of the lower byte, obtained by adding 511-byte data one
byte at a time from the beginning.
• Insurance failure threshold
The limit of a varying attribute value. The host compares the attribute values
with the thresholds to identify a failure.
If an unrecoverable error is detected during execution of a command received by
the device from the host computer, the device saves the SMART error log on the
disk medium.
The host computer can issue the SMART Read Log Sector sub-command (FR
register = D5h, SN register = 01h) and read the SMART error log.
Table 5.10 SMART error log data format (1/2)
Byte Item
00 Error log version number
01 Error log index
02 Error log 1 Command Data 1 Device Control register
03 Features register
04 Sector Count register
05 Sector Number register
06 Cylinder Low register
07 Cylinder High register
08 Device/Head register
09 Command register
0A to 0D Elapsed time [ms] from the point
when the power is turned on
until command reception
0E to 3D Command Data 2 to 5 (The format of each type of
command data is the same as
that of byte 02 to 0D.)
3E Error data Reserved
3F Error register
40 Sector Count register
41 Sector Number register
42 Cylinder Low register
43 Cylinder High register