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

From: Paul Koning <pkoning_at_equallogic.com>
Date: Thu Feb 3 08:22:31 2005

>>>>> "Jay" == Jay West <jwest_at_classiccmp.org> writes:

 Jay> You wrote...
>> When I was in college, we had an IBM 1311 that sprang a leak
>> (hydraulic head actuator...) spraying hydraulic fluid all over the
>> system pack. The FE repaired the drive, wiped the heads and pack
>> with solvent, and started things back up. Worked just fine.

 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
Received on Thu Feb 03 2005 - 08:22:31 GMT