>  HB> Does the CD rotate at different speeds as the laser reader moves
 >  HB> toward the outer disc?  Is there more data in the outer rim than
 >  HB> the inner rim?
 > The CD rotates at roughly 500 rpm at the start as it is read from centre
 > to outside edge.  At the outer diameters, the speed is 200 rpm.  This is
 > done to ensure the data that comes off the disc is at the proper rate.
       I am far, far, far from being knowledgable about ANYTHING digital, but 
in thinking your reply through, it would seem that the rotation speed is the 
same for the inside edge of the CD as it is for the outside edge. When point 
A 
of the disk interior edge passes a stationary point off the disk 500 times in 
a minute, so would point B on the exterior edge. 
       My laymans logic would think the difference is the amount of digital 
data read from the inside track versus the outside track would be very 
different, with the exterior providing more data than the interior, provided 
it was given data at the same density (wrong term?). 
       Where am I missing the boat?
Thanks, John
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