Brickcom NR-2008, Руководство пользователя

Страница: 88 / 184

www.brickcom.com.tw
87
2
、
Attribute Description
Attribute Description: name of detection item. Manufacturer can increase or decrease
。
As ATA standard update
constantly, sometimes different models in same brand maybe different ,but must ensure major test items specified
in S.M.A.R.T .(although different manufacturers have specific naming convention ,the essence of monitoring is the
same.)
1 Read Error Rate
2 Spin up Time
4 Start/Stop Count
5 Relocated Sector Count
7 Seek Error Rate
9 Power-on Hours Count
10 Spin up Retry Count
194 Power temperatures
195 ECC on the Fly count
197 Current Pending Sector Count
198 Disconnection beyond repair
199 CRC cyclic redundancy check
200 Write Error Count
Note: Different manufacturers and different models have different attribute description, the 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 an 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.