Date: Fri, 18 Aug 2006 17:56:49 +0100 From: "Frank Mitchell" <mitchell@cloudynwuk.force9.co.uk> To: <freebsd-users@uk.freebsd.org> Cc: man-lug@lists.man.ac.uk, sc@mailman.lug.org.uk, freebsd-hardware@freebsd.org Subject: Exploding CDs Message-ID: <000101c6c2ed$4c2700a0$d3d6ae51@hal>
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A recent BBC2 programme: "Mythbusters" explored the rumour that some CD-ROM Drives go so fast they make CDs fly apart. Two Stunt Engineers organised an experiment and showed this actually happens with some brands of CD. Just before disintegrating, these disks assumed a sort of corrugated appearance, which suggests the problem is caused by Resonant Frequency (as with the Tacoma Narrows bridge) rather than "Centrifugal Force". The CD vibrates with alternate sectors oscillating in opposite directions. When the speed of the drive matches the Natural Frequency of the CD, the amplitude of the vibration gets large enough to crack the disk, which then falls to pieces. Does anybody have more information about this? Faictz Ce Que Vouldras: Frank Mitchell -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.405 / Virus Database: 268.11.3/423 - Release Date: 18/08/2006
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