Path: utzoo!mnetor!uunet!cbmvax!sterling
From: sterling@cbmvax.UUCP (Rick Sterling QA)
Newsgroups: comp.sys.amiga
Subject: Re: Hard disk vibrations
Message-ID: <3319@cbmvax.UUCP>
Date: 15 Feb 88 21:18:12 GMT
References: <5439@elroy.Jpl.Nasa.Gov>
Reply-To: sterling@cbmvax.UUCP (Rick Sterling QA)
Organization: Commodore Technology, West Chester, PA
Lines: 43

In article <5439@elroy.Jpl.Nasa.Gov> rgd059@Mipl3.JPL.Nasa.Gov writes:
> Howdy...
> 
> As you may have heard, we lucky folks in S. California had another incidence
> of terra infirma yesterday (a 5.0 earthquake).  My Amiga was turned off at the
> time (fortunately?!) but it raises an interesting question...
> 
> How much vibration can an operating hard disk take without crashing the heads
> or otherwise damaging it?  Should I worry about leaving it on all the time
> when it could get bounced around at any time?  (It's an ST251 I think (it's
> at home)... internal to A2000, 40meg, ST506 interface, but this is a general
> question).
> 
> This question is also relevant to the rest of you who live on solid ground.
> After all, your computer table can always get bumped....  :-)
> 
> Thanx....
> 
> Bob Deen  @  NASA-JPL Multimission Image Processing Lab
> rgd059@mipl3.jpl.nasa.gov		span:  mipl3::rgd059

The specs for my Conner 40 meg SCSI state :

 Non-Operating shock       75 G's

 Non-Operating Vibration    5-17 hz.  .020"
                           18-500hz   4 G's

 Operating Shock            5 G's  

 Operating Vibration        5-22 hz.  .010"
                           23-500hz.  .15 G's peak
 
 Operating specs guarantee no non recoverable errors.  Looks like you might
 expect problems with moderate quakes during reads and writes with a 
 Conner drive. Other drives may vary... check mfg. specs.

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   Rick Sterling             COMMODORE AMIGA TEST ENGINEERING
                             UUCP  ...{allegra,ihnp4,rutgers}!cbmvax!sterling 
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