After well over a year of research and trying to make Apple accountable for faulty firmware in some of their computers, I have finally given up. Apple still refuse to admit to any problem on these drives, and sadly I must devote time to other projects.
From the superdrive site:
Update 28/01/2007 02:47am (+11 GMT) Well, it looks as though Apple won't do anything about this problem. What I can advise however are a number of brands that do work accordingly - and why. It seems that Apple only support media created by the CMC factory. Discs made by this factory (and banded as other labels) seem to work fine in the drive. CMC make the Verbatim and possibly LG, SHINTARO, TDK and some DATACELL discs. This means in theory, any of these discs that happen to come from the CMC factory should work find. Anything else, and you'll get 2x burns.