Most retail DVDS are dual layered, meaning that it can hold up to 9.2 gig of data. All DVDRWs right now can only burn single layered dvds, which is 4.6gig. I've burned about 20 dvds so far, and I've always used the auto compression feature in dvd shrink to backup the entire DVD. But recently I've been watching a couple of Soprano dvds on my dell 20" lcd, and the artifacts are very noticable. I looked at my backups, and noticed that the movie files were compressed around 40 to 50%! Which obviously explained it. But even then, I can hardly notice the difference on TV. But now I'm more careful about the compression, and make sure that its always at least 70 to 80%, even if I have to take out some extras.