[Yordan5]

You're both (RobertM, setarip_old) technically correct. The argument was that in practical use those 2% extra data on a 25Gb disk would make absolutely no difference to your viewing experience when compressing a movie, on top of the fact that you'd be asking for trouble writing so close to the outer edge of the disk. I only gave the example of the StarWars trilogy to make the point that if I cannot see a difference when there's been more than 40% compression what's the point of running the risk of a coaster for an academic gain. We all know that BD-RB produces results that a nothing short of spectacular and it would take a lot more than 2% (that's half a Gig on 25Gb disk) for most people to actually see a visual difference. Technically we know that there would be a difference but we wouldn't be able to see it. I'd much rather just enjoy the movie instead of trying to ruin the experience looking for miniscule artifacts the whole time.