Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!usc!brutus.cs.uiuc.edu!apple!vsi1!daver!tscs!pdn!boake2!jc3b21!fgd3
From: fgd3@jc3b21.UUCP (Fabbian G. Dufoe)
Newsgroups: comp.sys.amiga
Subject: Re: Is this odd?
Message-ID: <816@jc3b21.UUCP>
Date: 16 Dec 89 05:51:57 GMT
References: <1487@uwm.edu>
Organization: St. Petersburg Jr. College, FL
Lines: 23

From article <1487@uwm.edu>, by mamba@csd4.csd.uwm.edu (Paul A Deisinger):
> Wouldn't this have the sideaffect of magnetizing the metal hub and shutter
> on the disk?  This would be *very* bad I would think.

     No, it doesn't magnetize the metal hub and shutter on the disk.
Remember a bulk tape eraser is an electromagnet running off alternating
current.  Consequently, the polarity of its magnetic field is reversed
sixty times a second.  As a result, properly used, it will demagnetize
objects on which it is used.

     The proper procedure is to place the disk on the eraser (or hold the
eraser over the disk, depending on how your eraser is designed).  Then
switch it on and move the disk relative to the eraser so all then magnetic
surface has been well exposed to the magnetic field.  Next, move the disk
away from the eraser.  When the disk and eraser are about three feet apart,
switch off the eraser.

--Fabbian Dufoe
  350 Ling-A-Mor Terrace South
  St. Petersburg, Florida  33705
  813-823-2350

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