[KLUG Members] "THE ULTIMATE CD SPEED LIMIT!"

[Bert]

magoo wrote:

>Hello KLUGites! 
>
>Last night we shared a web site that has some pretty 
>funny technology information.  Spin a CD-ROM at 36,000 RPM! 
>See what happens.    W  A  R  N  I  N  G  ! ! ! 
>DO NOT TRY THIS AT HOME OR EVEN AT A KLUG MEETING! 
>
>B E N C H M A R K S :
>----------------------- 
>My $564 NEC Multispin CD-ROM Reader circa 1993 is a 2X or
>double speed and runs at 400 revolutions per minute (RPM).
>A 48X CD-ROM drive runs at 9,600 RPM.
>
>Introduction: 
>Have you ever loaded a faulty CD into a high speed (30X or higher)
>CD-ROM player, heard it spin up to incredible speeds, rattling and
>whining, and thought to yourself: "this thing is going to explode"? When
>CDs came out they were heralded as the solution for the need for high
>storage-high speed information devices, transferring data at a whopping
>150kb/s, but like all technologies, 1x CD players quickly became
>obsolete as the need for higher and higher transfer rates pushed for
>faster players, and, with them, higher rotational speeds. As we advance
>into the 21st century CD players are reaching the ultimate speed limit:
>we are getting to the point where the CD player simply can not spin the
>CD any faster or else the CD will literally fly apart. 
>
>On the interests of the advancement of high speed computing PowerLabs
>brings to you:  "THE ULTIMATE CD SPEED LIMIT!" 
>
>===================================================================== 
>YES...  A CD DISC WILL EXPLODE!
>http://www.powerlabs.org/cdexplode.htm      <===  HERE IS THE URL! 
>===================================================================== 
>
>MORE FUN FACTS THAT WILL MAKE YOUR HEAD SPIN!!!
>
>A DVD's stronger tensile properties mean it can spin at up to 32000 rpm
>before serious problems arise, compared to 23000 rpm for a CD-ROM.
>
>A CD-ROM, for example spins from 539 rpm at the inner edge, to 210 rpm
>at the outer edge.
>
I don't know how you mean this but I don't think a cd can run on 2 
different speeds at the same time, however the speed in km/h (or 
miles/h) is on the outer edge much higer than on in the inner edge. 
Simple because the distance to travel, in the same time, is about pi 
(outer - inner) diameter bigger.

NB you should try putting a cd in a microway oven the effect is really 
funny! (you may have to play with the watts put in to get the best result)

>
>TRANSFER RATE
>This usually refers to the player's capacity to deliver data. The first
>CD-ROM drives were designed to read 75 sectors of data per second, which
>means that it transferred 150 KBytes of user data per second to the
>computer's CPU. This basic transfer rate is now thought of as 1X,
>because current drives specify theirs as multiples of that rate--i.e.
>6X, 8X, etc.
>
>WAY TOO MUCH TECHNICAL INFORMATION ABOUT CD & DVD DISCS!!!
>************************************************************
>GLOSSARY OF CD AND DVD TECHNOLOGIES
>http://www.cdpage.com/Compact_Disc_Glossary/glossarym.html
>
>
>
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