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From: jbs@mit-eddie.UUCP (Jeff Siegal)
Newsgroups: net.micro
Subject: Re: sideways hard disks
Message-ID: <796@mit-eddie.UUCP>
Date: Wed, 18-Dec-85 23:13:21 EST
Article-I.D.: mit-eddi.796
Posted: Wed Dec 18 23:13:21 1985
Date-Received: Sat, 21-Dec-85 04:45:03 EST
References: <790@brl-tgr.ARPA> <459@eneevax.UUCP>
Reply-To: jbs@mit-eddie.UUCP (Jeff Siegal)
Organization: MIT, Cambridge, MA
Lines: 26

In article <459@eneevax.UUCP> hsu@eneevax.UUCP (Dave Hsu) writes:
>In article <790@brl-tgr.ARPA> MEAD@usc-eclb.arpa (Dick) writes:
>>The head-arm assemblies are built with flex tension forcing the head onto
>>the disk platter and the heads are forced away and fly due to the turbulence
>>caused by the spinning disk platters ( a very simplistic explaination, I know)
>>so it does not matter which orientation the disk is in, other than to provide
>>for ventilation or reduction of heat on the pc card attached
>>Most disk makers state in their specs that orienation is not a factor.
>>-------
>
>On the other hand, the platter assembly is usually mounted directly to the
>bottom of the case, and some warpage occurs if too much heat builds up,
>affecting the angle between the heads and the platters.  I'm not certain
>what effect mounting the drives sideways has on this warpage, but I suspect
>it may become worse as the the weight of the platters will torque the spindle
>instead of moving it towards the base of the drive housing.
>
>Comments?
>

I seem to remember installing a 160 Mb 8" Fujitsu drive which had a 
switch one was instructed to set to 0 for vertical installation and
1 for horizontal installation.  I have no idea what this switch did 
(if anything).  Has anyone seen anything like this?  Any ideas?

Jeff Siegal - MIT EECS (jbs@mit-eddie)