Article View: comp.sys.mac
Article #22388Re: how strong of a magnet?
From: Dean Benz
Date: Wed, 02 Dec 1987 01:32
Date: Wed, 02 Dec 1987 01:32
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1894 bytes
In article <9554@shemp.UCLA.EDU> flowers@CS.UCLA.EDU () writes:
>Recently people suggested unformatting a floppy by using a magnet. I
>needed to do so, so used a donut magnet about 1 inch in diameter
>(don't know the strength), and the floppys were readible just fine
>afterwards. While I'm gratified to know that they aren't THAT
>vulnerable, I'm wondering just how strong of a magnet is needed for
>this task. (This time I ended up formatting them on a PC to get the
>needed effect).
I personally have 2 four inch diameter x 1 inch thich Speaker magnets that I
use to "unformat disks". It does seem to take quite a bit of effort to
convince the mac the disk is completely unreadable. I tried using a cassete
deck demagnetizer a few times but was unable to make the disk completely
unreadable. The big magnets do quite a nice job and are readily available?
(Know anyone who has recently blown a home or car speaker, ask them for
the dead one and pry the magnet off the back.) Good Luck.
Dean Benz
UUCP: {ucbvax!ucdavis,sdcsvax,ucivax,ucla-cs}!ucrmath!hope!deano
ARPA: ucrmath!hope!deano@sdcsvax.ucsd.edu or ucrmath!hope!deano@ics.uci.edu
USNail: Dean Benz, 1110 Blaine St. Apt. 108 Riverside Ca 92507.
Phone: (714) 686-6131 (U.C. Riverside: Home of, Ah, Well, Gimme a sec.)
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!husc6!cmcl2!nrl-cmf!ames!sdcsvax!ucsdhub!ucrmath!hope!deano From: deano@hope.UUCP (Dean Benz) Newsgroups: comp.sys.mac Subject: Re: how strong of a magnet? Message-ID: <73@ucrmath.UUCP> Date: Tue, 1-Dec-87 20:32:56 EST Article-I.D.: ucrmath.73 Posted: Tue Dec 1 20:32:56 1987 Date-Received: Sat, 5-Dec-87 11:17:21 EST References: <9554@shemp.UCLA.EDU> Sender: news@ucrmath.UUCP Reply-To: deano@hope.UUCP (Dean Benz) Organization: University of California, Riverside Lines: 24