JA> I am far, far, far from being knowledgable about ANYTHING
 JA> digital, but  in thinking your reply through, it would seem that the
 JA> rotation speed is the  same for the inside edge of the CD as it is for
 JA> the outside edge. When point A  of the disk interior edge passes a
 JA> stationary point off the disk 500 times in  a minute, so would point B
 JA> on the exterior edge.
 You are correct.. a revolution per minute is a revolution per minute no
 matter where you happen to be on the disc.  But that doesn't mean that
 the rate at which the data is read cannot be modified if necessary.
--- GEcho 1.00
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