Paul wrote:
> John Corliss wrote:
>> (clipped)
>> But back to the hard drives, I'd like to find something that will mount
>> so as to suck the hot air right off of the hard drives and out of the
>> case. I would prefer not to use something that will suck the heat off of
>> the hard drives and distribute it into the case, but maybe that
>> additional fan in the 5.25" empty bay will render that concern of no
>> consequence. Any recommendations?
>
> If you look at this patent application, I don't think anything is
> getting through that breather hole :-) The breather hole is only
> intended for pressure equilization, when barometric pressure changes.
>
> http://www.wipo.int/ipdl/IPDL-CIMAGE...EMENT_SET=DECL
>
> Example of a commercial breather hole filter:
> http://www.donaldson.com/en/diskdriv...ary/000610.pdf
>
> Also, from an IBM disk manual:
>
> "Do not cover the breather hole! Covering the
> breather hole may result in loss of data."
>
> I still don't understand why the pressure is so significant. If
> you take a computer to Boulder Colorado, the air inside the HDA is
> going to get thinner, so big deal ? I wonder if flexure of the
> cover is the problem ?
>
> http://www.storagereview.com/guide20...p/packAir.html
>
> No matter how you move air over the disk, the air is a soup of
> particles that are monstrous in size compared to the aperture on
> the breather filter. A more dangerous situation, would be opening
> a bottle of solvent next to the drive, as vapour phase is likely
> to be a more effective poison than particulate (even if there is
> a diffuser channel).
Wow! Thanks for all the clarification.
> I built a frame that fits over three 5.25" drive bays, and the
> frame holds a fan. That is how the disk drives in one of my
> computers get cooled. It pulls cool air from the outside over
> the drives. Another of my computers has a fan mounted in front
> of one of the drive cages, which performs the same function.
>
> Here is an example of a module for a coolermaster CMstacker case.
> It consists of a fan plus HD cage. Some other cases fasten the
> fan to the case, and the cage is removable.
>
> http://www.i-tech.com.au/products/item5641.asp
Not sure how this would mount in my case.
> The two enemies of the hard drive, are heat and moisture. The
> allowed temperature drops with increased humidity. At 60% R.H. you
> are allowed about 35C. (IBM or Hitachi disk OEM manuals have curves
> for allowed environmental conditions.) Now, if I am to believe that,
> then how do people in tropical countries use these drives ?
Air conditioning?
> http://www.hitachigst.com/tech/techl...Deskstar_7K250
> "Deskstar 7K250 Specification v1.5 (Serial ATA)" - PDF pg.35
> http://www.hitachigst.com/tech/techlib.nsf/techdocs/17351B59F3028F4486256D3D0065D995/$file/d7k250S_sp.pdf
Thanks for your reply, Paul.
--
Regards from John Corliss