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Disk Media Management
412 C141-C013
Table 7.5 SMART ASC/ASCQ
ASC ASCQ Description
5D 12 The value of the read error rate attribute has reached its
threshold.
14 The value of the G-list update frequency attribute has
reached its threshold.
41 The value of the write error rate attribute has reached its
threshold.
43 The value of the seek error rate attribute has reached its
threshold.
56 The value of the spin-up attribute has reached its threshold.
64 The value of the number-of-remaining-alternate-sectors
attribute has reached its threshold.
FF Reporting in TEST mode.
0B 01 The device temperature has exceeded its threshold.
Failure prediction data is always logged and analyzed regardless of the setting of
the "DExcpt" bit (MODE SELECT parameter on page 1C). (The "DExcpt" bit
value specifies whether to allow reporting as described in Section 7.6.4.)
7.6.3 Failure prediction method
a. Read error rate attribute
The HDD monitors the number of read errors that have occurred during read
processing, in relation to the number of sectors that have been actually read
and the number of sectors contained in the sample. If the number of read
errors reaches the threshold, the HDD considers that a failure prediction
reporting condition has developed.
The read sectors and read errors counted include those involved in read
processing that was explicitly performed by READ commands or performed
by the Read Ahead Cache function.