04-21-2008, 08:51 PM
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| Junior Member | | Join Date: Sep 2009
Posts: 0
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 Re: Recommended hard drive temperature
On 21 Apr 2008 09:48:45 GMT, Arno Wagner put finger
to keyboard and composed:
>Previously Franc Zabkar wrote:
>> What about fluid dynamics? Maybe there is an optimal temperature for
>> the platter lubricant and/or air bearing.
>
>Possibly. Many drives in the Google study should actually
>be pre-fluid bearing, if I remember correctly when they became
>mainstream. A part would be FDBs though and maybe there is some
>increased vibration effect or the like at lower temperaturers.
When I wrote "fluid dynamics", I was referring to the air flow under
the R/W head, ie the air bearing, not the motor bearing.
>Now what would be interesting is SMART status changes for the
>drives that dies at lower temperatures, compard to those that
>died at other temperatures. Also temperature vs. FDB percentace
>would be of interesst and temperature vs. disk age would be too.
>Also disk performance in the week before death vs. temperature
>would be nice.
>
>> I found this interesting Samsung patent whose inventors claim that
>> "flying height drops significantly in humid conditions" and that this
>> can be remedied "by increasing the temperature of the air flowing
>> between a slider's air bearing surface and the rotating disk surface
>> it accesses".
>
>> Method and Apparatus Reducing Flying Height Drop in a Hard Disk Drive
>> Under Humid Conditions:
>> http://tinyurl.com/4s5brl
>> http://www.freshpatents.com/Method-a...0070297085.php
>
>Interesting, I will have a look at there references! Not relevant
>for data-center operation, however, since humididy is also strictly
>regulated in there.
>
>Arno
Static electricity becomes an issue in low humidity environments. I
recall one site where the Control Data hard drive would log a "status
error" whenever the operator touched it. The solution was an
antistatic mat. At other sites I've seen humidifiers used to solve
this kind of problem. I would think that any datacenter with a
humidifier would encounter the issues addressed in the Samsung patent.
- Franc Zabkar
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