Bad hard driver [SOLVED]
Michael Powell
nightrecon at hotmail.com
Thu Feb 10 20:06:37 UTC 2011
Daniel Zhelev wrote:
[snip]
>
> The last worrying thing is the
>
> 200 Multi_Zone_Error_Rate 0x0008 200 189 000 Old_age Offline
> - 3
>
> Which according to the Internet is some mysterious value that none knows
> what it stands for, so is 3 of that mystery good?
>
Each cylinder track has a width. A head seek is nominally supposed to
exactly center the head over the central axis. There is some slight
tolerance as to accidental offset, but the maximum concentration of gaussian
magnetic domain orientation should be concentrated in the center of each
cylinder track.
Temperature changes between cold and 'steady state' operation cause very
small changes in the size of mechanical moving parts. A little slop factor
will happen when read/write happens while a drive is warming up from cold.
As long as the number remains small and doesn't change often it's probably
nothing to worry over. If it does change a lot constantly it may be an
indicator of worn mechanical parts. Such a thing should correlate with a
large value of power on hours. A drive near the end of it's life may get
wobbly head syndrome. :-)
The main consideration in both questions is a small number that maybe
increments every once in a blue moon is nothing to become overly concerned
with. Rather consider them a long term baseline and only become alarmed when
they show a rather sudden and large deviation in rate of change from the
baseline. Generally when this occurs the numbers will change in fairly
dramatic fashion quickly and generally continue this change from that point
on. It is this pattern you look for as a possible "pre failure" warning.
-Mike
[snip]
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