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Why is it better not to use burn-proof? >>
To make a long story short, it's better not have any errors than have to invoke a form of error correction.
See
here. Yamaha's technology is the best in some ways, but burnproof is good. (Note that the article above is a bit old, with latest burnproof technologies reducing the link to under 1 micron.) Also, it's interesting to know that 24X burns on some of our drives sort of use burn-proof on all discs.
So theoretically, if you believe the hype Yamaha should make the best burns. But in real-life this may or may not be the case, since other drives have different features that are good too, like Teac's ability to test the burn quality and adjust laser strength on the fly, not just media quality prior to the burn as with the Yamaha.