Disk platters and water (was: Re: NOVA4 6070 disk booboo)

[Tore S Bekkedal]

I've seen that illustration in an Atari ST programmer's manual!

On Thu, 2005-02-03 at 10:19 -0500, Ashley Carder wrote:
> >  Jay> Wonder what the head-disk gap was on a drive of the IBM 1311
> >  Jay> vintage.
> > 
> > Probably not dramatically larger than that of the RK05.  I don't
> > remember the number.  It was shown on a drawing on the disk pack bags
> > that DEC created to remind people not to put fingerprints on the
> > platters.  I remember it showed a fingerprint, a dust particle, and a
> > hair, drawn to scale next to the head height.  The fingerprint was
> > about 3-5x the flying height, so measure a fingerprint and find
> > out...  It also was perhaps 1/50th of a hair.  So perhaps a few
> > micrometers?
> > 
> > paul
> 
> I knew I had seen the same diagram, so I looked in my RK05 manual
> and found the picture, which shows the following:
> 
> Head flying height:  100 microinches
> Smoke particle thickness : 250 microinches
> Fingerprint smudge: looks  about 2x the size of a smoke particle
> Lint and dust: looks about 2/3 the thickness of a hair
> Hair :  4/1000 of an inch
> 
> Reference : Page 1-17 of the RK05/RK05J/RK05F maint. manual
> 
> Ashley
> 
-- 
Tore S Bekkedal <toresbe at ifi.uio.no>