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Old 27-September-2010, 23:17
El Gringo El Gringo is offline
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Default that was a little scarey

I was playing a computer game yesterday......and my newish external cd drive made an almighty bang.

It's on top of the tower next to the monitor about twelve inches from head


http://en.wikipedia.org/wiki/Compact_Disc_shattering

http://www.youtube.com/watch?v=F6avp29GqXo
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Old 28-September-2010, 09:54
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Tia Tia is offline
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Default Re: that was a little scarey

Had it blown up?
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Old 28-September-2010, 21:24
El Gringo El Gringo is offline
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Default Exploding CDs, Resonant Frequency, Natural Frequency

the disc inside blew up.
http://www.mail-archive.com/freebsd-.../msg01336.html
Exploding CDs
Frank Mitchell
Fri, 18 Aug 2006 10:42:53 -0700

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.
and the trick they do with a wine glass.

the approx. two second sound (high pitch drone) I mistook for the CD ROM drive speeding out of control was in fact the sound of the CD vibrating before exploding.
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Old 16-October-2010, 15:44
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Default Re: that was a little scarey

My friend experienced the same. Apparently different makes are only rated up to certain speeds, beyond this they can achieve their resonant frequency and self destroy, taking your drive with them. It's almost James Bond " this message will self destro.." Luckily DVD rewriters are not very expensive if they are the standard ones. (hope yours was and you could just replace the drive rather than the whole extrnal box etc) You just have to be careful what blank DVD/CD 's you buy. You may have a claim against the game producers ("product fit for purpose and all that") but good luck getting anywhere with it. Ron
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Old 17-October-2010, 11:13
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centaur centaur is offline
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Default Re: that was a little scarey

Scary stuff indeed.

To be a tad pedantic, it was 'Mission Impossible' rather than James Bond, which had the 'this tape will self-destruct in 5 seconds' tagline.
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Old 17-October-2010, 23:10
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Default Re: that was a little scarey

Scary stuff indeed.

To be a tad pedantic, it was 'Mission Impossible' rather than James Bond, which had the 'this tape will self-destruct in 5 seconds' tagline.
Originally Posted by centaur View Post
I new that too but didn't want to give my age away.............

JT
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