[LargeFormat] rest

[Joshua Wein]

Ooops, I was right about the "constant linear
velocity," a 1x CD drive (most audio) spin at 200 RPM
on the inside tracks and 500 RPM on the outside
tracks. I was wrong about the concentric circles
though, CDs are spiral tracks as well. Hard drives are
concentric circles, as are floppies.

-Josh


--- Joshua Wein <jayelwin@yahoo.com> wrote:
> Turntables function at a "constant angular velocity"
> i.e they spin at the same speed all the time.
> Therefore the sound quality of a song early on the
> record is actually better than later, since a
> greater
> distance is travelled in the same time and therfore
> more vinyl passes under the needle in any given time
> interval. And as we all know it is a spiral.
> 
> CD's function at a "constant linear velocity" and
> reading begins in the middle. As the laser reads
> outwards the disc slows down so the same amount of
> plastic passes by it in any given time interval. And
> CD's are not spiral, they are concentric circles. 
> 
> Hope this helps.
> 
> -Joshua Wein
> --- Les Newcomer <lnphoto@ismi.net> wrote:
> > 
> > 
> > Don Wilkes wrote:
> > > 
> > > At 08:13 AM 1/30/01 -0500, Thomas W. Keech, Jr. 
> 
> > (Tom Keech) wrote:
> > > 
> > > >In an old copy of The Amateur Photographer's
> > Handbook ( 8th edition revised
> > > >-  1973)  by Aaron Sussman, he describes a
> method
> > of using a turntable with
> > > 
> > 
> > 
> > "What's a turntable? "   ;-)
> > 
> > On the modern end, does anybody know what RPM a CD
> > spins at?
> > 
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