04-21-2008, 11:04 PM
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| Junior Member | | Join Date: Sep 2009
Posts: 0
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 Re: Recommended hard drive temperature
Previously Franc Zabkar wrote:
> 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.
Ah. That would be a different type of dynamics, that, while having
some fluid properties, is not fluid dynamics.
>>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.
I am just saying that very likely all HDDs in the study were
running with similar humidity, and therefore humidity will
not be a factor examined.
Arno
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