This advice came from a cd-r related faq (sorry, I lost the url.) Should this be followed in every case? "Generally accepted capacities are 650 MB for 74 minute discs and 550 MB for 63 minute discs. High quality recording should utilize only 550 MB or less of a 74 minute disc, because performance may rapidly degrade at large diameters. Consequently, usable capacities of 74 and 63 minute discs are nearly the same."
that sounds pretty sketchy...I've never even seen or heard of 63 minute CDRs. I know of 74, 80, and 90 min CDRs