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7.6 SMART (Self-Monitoring Analysis and Reporting Technology)
C141-C013 411
(5) At certain time intervals (nearly hourly). If the state where there is no
command to execute does not last for one second or longer, a log save
operation may be postponed until the appropriate condition is fulfilled.
(6) When a reset condition is generated
(7) When the REZERO UNIT command is executed
(8) When the STOP UNIT command is executed
(9) When the WRITE BUFFER (Microcode Download) command is executed
(10) When an error is reported (CHECK CONDITION status)
(11) When the FORMAT UNIT command is executed
(12) When alternate processing is performed
(13) When the MODE parameter is changed (MODE SELECT command)
(14) When failure is predicted (except in TEST mode [=5D/FF])
(15) When the temperature enters a warning state (with EWASC = 1 on Mode
Page 1C)
(16) When the Background Media Scan function ends
7.6.2 Data analysis
The HDD judges its own condition by analyzing data that has been collected to
predict failure. Data is analyzed by the method predetermined for each attribute.
If an attribute value reaches its corresponding threshold, the HDD judges that the
remaining life of the HDD is short or that certain failure is occurring. In such
case, the sense code (ASC/ASCQ) of the parameter that has reached its threshold
is set on the SMART status page (Log Page 2F).