N多误解的承清：WD硬盘Smart信息解读！

gz0921 · 发表于 2010-1-7 12:59

本帖最后由 gz0921 于 2010-1-7 13:01 编辑

Self-Monitoring, Analysis, And Reporting Technology
S.M.A.R.T. is an attempt to predict imminent drive failure by monitoring selected drive performance and calibration characteristics.  Each monitored characteristic (Attribute) is used to calculate an Attribute Value.  Attribute Values range from 1 to 253 with 1 being worst case, 253 being best case, and 100 being nominal.

For WD drives, the normalized attribute value will range from 1 to 100 or 1 to 200, depending on the attribute.  Error rate, total spin ups, spin up retries and calibration retries attributes are implemented as during normal operation (“on-line”); whereas, Multi-zone Error Rate test is performed “off-line”.  This test performs a read-verify-all operation and calculates an error rate.  These Attributes are updated and stored on the drive in the reserved area of the disk.  Also stored on the drive is a set of Attribute Thresholds that correspond to the calculated Attribute Values. An impending degrading or faulty condition is indicated when the calculated Attribute Value becomes less than or equal to its corresponding Attribute Threshold value.

The drive periodically saves all data associated with the S.M.A.R.T. feature.  The data is written to the reserved area of the disk after certain time of inactivity by the host.  The save of the data is performed in the background and will not cause a decrease in performance.

SMART Attribute Information

Each SMART attribute indicates a certain characteristic of the drive and has its own value derived from a special normalization algorithm and formula. The attributes listed below are specific to WD drives. Other drive manufacturers may have their own attribute definition.

RAW Read Error Rate
This attribute indicates the average rate of read error retries.

Spin Up Time
This attribute indicates the average spin up time, which describes amount of time it took to spin the platters up to their rated rotation speed.

Start/Stop Count
This attribute indicates the amount of drive's start/stop cycles.

Reallocated Sector Count
The attribute indicates the amount of bad sectors relocated to a spare area.

Seek Error Rate
This attribute indicates the average rate of seek errors.

Power On Hour Count
This attribute indicates how long the drive was working (powered on).

Spin Retry Count
This attribute indicates the number of retry of drive spin up at power up.

Calibration Retry Count
This attribute indicates the number of retry of drive calibration after spin up.

Power Cycle Count
This attribute indicates the number of disk power cycles.

Relocation Event Count
This attribute indicates the number of times recalibration was requested.

Current Pending Sector Count
This attribute indicates the amount of sectors pending for relocation. Sectors with read or write errors are recorded and await relocations to spare sectors when next write commands are issued.

Off-line Scan Uncorrectable Sector Count
This attribute indicates the number of firmware uncorrectable error sectors detected during the last off-line scan.

UltraDMA CRC Error Rate
UDMA controller performs a CRC error checking on data while transferring between the host and HDD. Each time the error occurs, a retransmission is requested. This attribute indicates the average rate of the CRC errors.

Multi Zone Error Rate
This attribute indicates a rate at which write retries are requested.

GMR Head Amp
This attribute indicates the amplitude of GMR (Giant Magnetoresistive) head.

Temperature This attribute indicates the temperature for drives equipped with thermal sensor.

gz0921 · 发表于 2010-1-7 13:03

本帖最后由 gz0921 于 2010-1-7 13:09 编辑

原来属性值是越大越好~~而且显示的属性值是经过归一化的~~属性值比阈值低的时候才是错误状态，而不是高的时候~~~

-_-~~

不知道西捷的硬盘是怎样一个情况~~

西数的官方检测软件叫做:Data Lifeguard Diagnostic for Windows

同样不限于西数品牌的硬盘,也可以检测其他品牌的硬盘。

如果西捷的硬盘有三黄，不妨也拿这个试一下，看看能不能通过？

fish2fish · 发表于 2010-1-7 13:28

本帖最后由 fish2fish 于 2010-1-7 13:43 编辑

SMART都一样的，只是不同品牌的范围不同

分当前、最差、阈值，和数据，前三者是评估值，数据则是累计次数、数值或者时间等等

不论“数据”显示的数值是多少，只要“当前”的评估值低于“阈值”了，那就表示硬盘出现故障
如果“最差”低于“阈值”则表示曾经出现过故障

至于“数据”，其实就是用来计算“当前”或“最差”的原始记录，硬盘自身会根据“数据”中的数值来按照每个SMART项的公式来进行计算“当前”的评估值，也就是“当前”＝f(“数据”)，“最差”＝min(“当前”,“最差”)，然后用来跟“阈值”进行比较

还有一种情况就是，阈值为0的项，对于这些项，无论“当前”、“最坏”、“数据”是多少都不会引起故障，这项只是一个硬盘状态的原始记录而已

gz0921 · 发表于 2010-1-7 13:42

谢谢LS的解释,对smart的理解又明确了一些~

zenhigh · 发表于 2010-1-7 14:40

我有块盘最差比当前还高是怎么回事：

07项，寻道出错率

gz0921 · 发表于 2010-1-7 14:47

建议楼上别用第三方软件检测~~

fangdejun · 发表于 2010-1-7 17:07

谢谢LS的解释,对smart的理解又明确了一些~

jhtie1977 · 发表于 2010-1-7 19:33

有时用TUNE检测是黄的,用WD 或ST的官软检测去是0

ramiel · 发表于 2010-1-7 19:35

别信这些参数了**用都没的，慢扫没红点才是王道，我那破1T突然死亡，看参数好得不得了，一扫一片红点……

jhtie1977 · 发表于 2010-1-7 19:39

是不是说我的WD黑C5项阀值是0,那么现在已经1400多了
,HDTUNE已经警告黄色了,也没问题吗谢谢

gz0921 · 发表于 2010-1-8 08:35

所以说HDTUNE根本就是扯淡的,数据值得范围是0-255,出现1400多这样的数值本身就是错误的~

Jankanwoo · 发表于 2010-1-8 09:36

是不是说我的WD黑C5项阀值是0,那么现在已经1400多了
,HDTUNE已经警告黄色了,也没问题吗谢谢
jhtie1977 发表于 2010-1-7 19:39

这个数据项比较重要

通常是有坏道了

剑剑 · 发表于 2010-1-8 10:24

看看就好

justinavril · 发表于 2010-1-8 17:56

顶下回去看

只看该作者 · 发表于 2010-1-8 18:04

提示: 作者被禁止或删除内容自动屏蔽

淋雨-ing · 发表于 2010-1-8 18:36

等翻译帝出现

Jankanwoo · 发表于 2010-1-8 18:39

所以说HDTUNE根本就是扯淡的,数据值得范围是0-255,出现1400多这样的数值本身就是错误的~
gz0921 发表于 2010-1-8 08:35

人才啊~~~

1400是硬盘自身的SMART报告不是HD TUNE的杜撰出来的.
HD TUNE的作用只是读取硬盘SMART信息, 然后以直观的方式显示出来.

gz0921 · 发表于 2010-1-8 19:38

本帖最后由 gz0921 于 2010-1-8 19:40 编辑

年关了，st给你一个贴多少钱？？？
左岸发表于 2010-1-8 18:04

我最近发了不少帖子了，才有人出来说我是QS已经算是奇迹了~呵呵~~

gz0921 · 发表于 2010-1-8 19:43

人才啊~~~

1400是硬盘自身的SMART报告不是HD TUNE的杜撰出来的.
HD TUNE的作用只是读取硬盘SMAR ...
Jankanwoo 发表于 2010-1-8 18:39

smart数据应该是一个0-253之间的值，HDTUNE报告一个1400多地数值显然是错误的，报告错了难道不可能吗？

fish2fish · 发表于 2010-1-8 22:18

本帖最后由 fish2fish 于 2010-1-8 22:19 编辑

是不是说我的WD黑C5项阀值是0,那么现在已经1400多了
,HDTUNE已经警告黄色了,也没问题吗谢谢
jhtie1977 发表于 2010-1-7 19:39

不要混淆阈值、当前、最差和数据，前三者是评估值，是通过计算得到的，而“数据”则是原始记录，再说明白点就是：数据是变量，“当前”是“数据”这个变量的函数

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N多误解的承清：WD硬盘Smart信息解读！

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