Re: Mars Rover Not Responding

From: BarryNL (barry_at_nospam.nl)
Date: 01/30/04 

Date: Fri, 30 Jan 2004 19:14:42 +0100

Yoyoma_2 wrote:
> Tony Hill wrote:
>
>> On 29 Jan 2004 16:20:29 -0800, brucebo@my-deja.com (Bruce Bowen)
>> wrote:
>>
>>> Uncle Al <UncleAl0@hate.spam.net> wrote in message
>>> news:<4016A579.397B55A@hate.spam.net>...
>>>
>>> This is a trivial engineering problem to address. Encase the HD in a
>>> larger sealed and presurize container, with enough surface area and/or
>>> internal air circulation to keep it cool. A low power 2.5" HD
>>> shouldn't take that much larger of a container. What about the flash
>>> sized microdrives?
>>
>>
>>
>> Yeah, and the 4+ Gs that the drive would experience during take-off
>> would do wonders for that drive! Not to mention the high levels of
>> radiation in space would probably fry any drive (to the best of my
>> knowledge, no one makes rad-hardened hard drives).
>
>
> I actually know of some rad-proofing drives. Actually i hear there are
> alot of them, they are mostly used in the military (mil-spec drives).
> For example, hard drives on an aircraft carrier have to be able to take
> a direct nuclear assult and still function. Little piece of cold war
> trivia for you :)
>
> Ran proofing isn't a very big deal.
>
> According to this page i just pulled up at
> random(http://www.westerndigital.com/en/products/products.asp?DriveID=41),
> normal desktop "run of the mill" drives can take impulses of up to 250G
> when non-operating, and 60G while operating at a delta-t of 2 seconds.
> That's pretty good.
>
> So if that's for ordinary hard drives, immagine a mil-spec drive. I
> doubt carriers kept all of their data on flash memory in the 1970s. Even
> if they use mag tape reel, it implies that they have developed some sort
> of rad-proofing for it.

And the 4Gs thing is a non-issue. Most normal ATA drives can take around
300Gs when not operating or 30Gs when running without damage.

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