Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!henry
From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.rumor
Subject: Re: Computer Horror Stories [Funny]
Message-ID: <6492@utzoo.UUCP>
Date: Wed, 12-Mar-86 14:05:58 EST
Article-I.D.: utzoo.6492
Posted: Wed Mar 12 14:05:58 1986
Date-Received: Wed, 12-Mar-86 14:05:58 EST
References: <14700001@hplabsb.UUCP> <476@mmm.UUCP>, <668@sfmin.UUCP>
Organization: U of Toronto Zoology
Lines: 16

> The Calcomp DS-12 disk drive was another matter.  It was attached to the
> 1130, and used an 11 platter disk.  The heads were operated on a linear
> motor, and moved FAST!  I could imagine it rocking if you went from
> edge to edge repeatedly! ...

At the engineering lab where I worked part-time and summers while I was
an undergrad, we once got in the latest thing in disks -- an RK05.  Well,
it was the latest thing in disks for this lab, which was pretty backward
in some ways.  So we ran diagnostics on it.  The RK05 was fairly high up
in an otherwise largely-empty rack.  One of the diagnostics tested all the
possible sizes of seek, from smallest to largest.  Since larger seeks take
longer, the frequency of the motion slowly swept downward.  When it hit
the resonant frequency of the rack, the rocking motion was impressive.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry