Date: Tue, 25 May 1999 08:23:14 +0100 (BST) From: Duncan Barclay <dmlb@ragnet.demon.co.uk> To: "Matthew D. Fuller" <fullermd@futuresouth.com> Cc: chat@FreeBSD.ORG, CONDOR <condor@inreach.com>, Eivind Eklund <eivind@FreeBSD.ORG> Subject: Re: secure deletion Message-ID: <XFMail.990525082314.dmlb@computer.my.domain> In-Reply-To: <19990524233433.D10261@futuresouth.com>
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On 25-May-99 Matthew D. Fuller wrote: > On Fri, May 21, 1999 at 02:13:09PM +0200, a little birdie told me > that Eivind Eklund remarked >> >> You want to run them through a microwave oven first. This will break >> the recording material (not the plastic) into approx 1 inch long >> areas, using a neat pattern of lightning to do it (I'm not kidding). >> >> No prize but passing your physics class if you can say why it goes to >> approx an inch long pieces, and all the effects then stop. > > Wavelength of the (appropriately named) microwaves? > > Microwaves use radio waves at the fundamental frequency of water, no? Microwaves operate in the 2.4GHz ISM band, just like 802.11 wireless LAN. Water resonates at about 20GHz, but with a low enough Q that the 2.4GHz gets the molecules moving. One major reason for not operating at 20GHz is that meat/food is very reflective to 20GHz (I can lookup the complex permativity for you if you need it) so that microwaves don't get into the food. Duncan --- ________________________________________________________________________ Duncan Barclay | God smiles upon the little children, dmlb@ragnet.demon.co.uk | the alcoholics, and the permanently stoned. ________________________________________________________________________ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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