At 08:43 AM 12/12/2000 -0600, John Foust wrote:
How about the possibility that the disc is warped
slightly
when it's punched from a larger piece of plastic?
That and Dwight's comments on the manufacturing process are also probably
spot on. Someone off list suggested that perhaps the plastic has a slightly
higher expansion co-efficient than the "label/backing" material which would
also account for it.
--Chuck