Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!texbell!nuchat!moray!siswat!buck
From: buck@siswat.UUCP (A. Lester Buck)
Newsgroups: comp.unix.i386
Subject: Re: Vertical mounting of SCSI drives?
Message-ID: <516@siswat.UUCP>
Date: 14 Mar 90 03:12:06 GMT
References: <3320003@hpnmdla.HP.COM> <3320004@hpnmdla.HP.COM> <292@odicon.UUCP>
Organization: Photon Graphics,  Houston
Lines: 20

In article <292@odicon.UUCP>, jlg@odicon.UUCP (John L. Grzesiak) writes:
< While the manual says ' No mounting restrictions ' and while this
< suggests that the drive will not malfunction in a vertical position,
< placing the drive in this manner will slow the seeks due to directly
< opposing gravity on the positioner. Also I can envision a day when
< you end up doing long seeks from high to low cylinders and have the
< arm hitting the zero stop with more force than usual. This position is
< not ideal from the standpoint of performance and reliability. 
< 
< John Grzesiak @ Omega Dynamics , Meriden Ct 
<   *** System ate signature - got indigestion - lost bandwidth - Amen ***

Your company may be Omega Dynamics, but your physics needs work.

Excercise for the reader: calculate the average acceleration of the
disk heads in a typical disk drive, say 1/3 stroke of 1" in 15ms.
Compare with the acceleration of gravity.

-- 
A. Lester Buck     buck@siswat.lonestar.org  ...!texbell!moray!siswat!buck