S.M.A.R.T. Glossary
ActiveSMART - is a well known S.M.A.R.T. monitoring software for hard drives. It uses S.M.A.R.T. technology for HDD diagnostic. Below you can find more information about S.M.A.R.T. attributes:
 S.M.A.R.T. Attribute
S.M.A.R.T. attribute is a specific property of disk being
monitored. Every S.M.A.R.T. attribute has a set of properties:
attribute value, its threshold, worst attribute
value and raw value. Specific threshold is
assigned to each attribute. Once the attribute value drops below
this threshold, S.M.A.R.T considers disk to be faulty. Some
attributes are considered life-critical and others are merely
"informative". T.E.C. with an "informative" attribute does not
necessarily means drive failure.
S.M.A.R.T. Attribute
value
Attribute values are used to represent the
relative reliability of individual performance or calibration
attributes. The current attribute value is the normalized raw
attribute data. The value varies between 1 and 100. The closer
the value gets to 1, the higher the possibility of a failure.
The device compares the attribute values with thresholds. When the
attribute values are larger than the thresholds, the device is
operating normally.
Raw attribute value
This is a raw attribute data. Usually it
shows exact amount of time, attempts or errors. For example: the
raw value of attribute Temperature is a drive temperature in
Celsius degrees, the raw value of Power on hours count attribute is
a amount of hours when drive was in power-on state. You can view
the Raw attribute value in the Text Report (Open SMART
Info tab and press Report button)
S.M.A.R.T. Attribute
threshold
This is the
lowest limit of a varying attribute value. S.M.A.R.T. compares the
attribute values with the thresholds to identify a failure. Each
attribute value has a corresponding attribute threshold limit. The
numerical value of the attribute thresholds are determined by the
device manufacturer through design and reliability testing and
analysis. Attribute thresholds are set at the device manufacturer’s
factory and cannot be changed in the field. The valid range for
attribute thresholds is from 1 through 253 decimal.
Worst value
This is the worst attribute value among the attribute values
collected to date. This value indicates the state nearest to a
failure so far.
What is T.E.C?
T.E.C. stands for "Threshold Exceeded
Condition" and basically means a failure. If one or more attribute
values are less than or equal to their corresponding attribute
thresholds, then the device reliability status indicates an
impending degrading or fault condition.
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