Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!samsung!zaphod.mps.ohio-state.edu!usc!henry.jpl.nasa.gov!elroy.jpl.nasa.gov!gryphon!richard
From: richard@gryphon.COM (Richard Sexton)
Newsgroups: comp.sys.amiga
Subject: Re: Is this odd?
Message-ID: <23729@gryphon.COM>
Date: 22 Dec 89 23:04:38 GMT
Reply-To: richard@gryphon.COM (Richard Sexton)
Followup-To: comp.sys.amiga.diskhubs
Organization: Trailing Edge Technology, Redondo Beach, CA
Lines: 19

>>>>     A trick that I've used successfully with disks that wouldn't format
>>>>clean is to pass them over a bulk tape eraser.  That seems to erase more
>*stuff deleted*
>>
>>Wouldn't this have the sideaffect of magnetizing the metal hub and shutter
>>on the disk?  This would be *very* bad I would think.
>*stuff deleted*
>
>Nope.  Degausers (demagnetizers) are AC electromagnets not DC.  It takes a
>DC electromagnet to generate a field that magnetizes.  If used properly, an
>AC electromagnet by having its poles swap at 60HZ scrambles the polarity of
>any ferrous (sp?) materials thereby demagnetizing or eraseing the disk. By
>saying "if used properly" I refer to the method of slowly pulling the
>degauser away from the tape/disk until the object is out of the field to
>ensure the object doesn't get magnetized to some more uniform polarity if the
>field were abruplty withdrawn.   This may not be the most technically
>accurate description, but I think it's adequate?

Umm, aren't they stainless steel ?