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-----Original Message-----
From Tom Fine: "... I can't think of what else polishing would effect, ."

It certainly could affect the balance and mass of the disk which could then
affect the playback speed.

Nobody has much  financial incentive to publish real  science because it
could only uncover shoddy engineering.

Bob Olhsson Audio Mastery, Nashville TN
Mastering, Audio for Picture, Mix Evaluation and Quality Control
Over 40 years making people sound better than they ever imagined!
615.562.4346 http://www.bobolhsson.com http://audiomastery.com