Drive Health

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SMART Attributes Meaning

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.

Attributes Description
ID (hex) Name Description
01 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.
04 Start/stop count Raw value of this attribute indicates total number of drive start/stop cycles (including both power on/off switching and suspend/wakeup switching).
05 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.
09 Power on hours count Raw value of this attribute indicates how long the drive was working (powered on).
0A Spin retry count Indicates number of times disk was unable to spin platters up on first attempt (lower values mean more retries).
0B Recalibration retries Indicates number of times recalibration was requested. Low value (multiple recalibrations) usually indicates some head positioning problem.
C2 Temperature This attribute shows temperature for drives equipped with thermal sensor. Exact temperature can be obtained from the Meaning column.
C8 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.



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