There are several attribute classes. Some of them are life-critical, but
some are not! If Drive Health reports very close T.E.C. date for the non-critical
attribute this is not a reason for panic. You shouldn't consider it as a
dangerous warning. To see what attributes are life-critical for your disk drive
turn on the "Mark Critical Atributes" switch in "View" menu.
Following is a list of some attributes. Please note that it does not describe all possible attributes.
||Read error rate
||Indicates a rate at which read retries are requested. Lower values indicate that there
is a problem with either disk surface or read/write heads.
||Raw value of this attribute indicates total number of drive start/stop cycles (including
both power on/off switching and suspend/wakeup switching).
||Reallocated sectors count
||Indicates amount of spare sector pool available. Spare sectors are used to replace
sectors that became bad for some reason. Value of 100 means that no sectors were remapped,
1 means that spare sectors are exhausted due to multiple remaps.
||Power on hours count
||Raw value of this attribute indicates how long the drive was working (powered on).
||Spin retry count
||Indicates number of times disk was unable to spin platters up on first attempt
(lower values mean more retries).
||Indicates number of times recalibration was requested. Low value (multiple
recalibrations) usually indicates some head positioning problem.
||This attribute shows temperature for drives equipped with thermal sensor. Exact temperature can be obtained from the Meaning column.
||Write error count
||Indicates a rate at which write retries are requested. Lower values indicate that there is a problem with either disk surface or read/write heads.