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200 Write Error Count
Note: Different manufacturers and different models have different attribute description ,user has
no need to know exact meaning ,attribute detection values enough for them.
3 Threshold
It is specified by manufacturer calculated through a specific formula. If there is a attribute value
lower than the threshold, which means HDD become unreliable and data stored is very easy to lose.
Composition and size of reliable attribute values is different for different HDD. It should be noted that,
ATA standard only provides some SMART parameters; it does not provide a specific value. "Threshold"
value is determined by manufacturers based on products’ features. Thus, results tested by
manufacturer provided detection software is very different from testing software under Windows
(such as AIDA32)
4 Attribute Value
Attribute value is the maximum normal value; the general range is from 1 to 253. Typically, the
maximum attribute value is 100 (for IBM, Quantum, and Fujitsu) or 253 (for Samsung). Of course,
there are some exceptions, for example, some models produced by Western Digital have two different
attribute values, and property value is set 200 when initial production, but after then it is changed into
100.
5 Worst
Worst value is the largest non‐normal value in HDD’s running. It is a value calculate for HDD’s
cumulative running, it is constantly refreshed according to running cycle, and very closed to the
threshold. Whether the HDD is normal by S.M.A.R.T analysis is based on the comparison with
threshold. The maximum value appear when new HDD start to use, which would continue to decrease
with the everyday use or error happen. Consequently, larger attribute values mean better quality and
higher reliability; smaller values mean more possibility of failure increases.
6 Dates
Actual values of HDD’s detection items, many items are cumulative values.
7 Status
It is current statues of HDD’s every attribute after analyzing and comparing above attribute values by
S.M.A.R.T, also is important information to judge HDD healthy or not.
There are three statuses: Normal, Alarm and Error‐‐‐‐which is closely related with
Pre‐failure/advisory BIT.