I copied American Gangster onto 2 discs using DVDFab. They were messed up, freezing when I tried to rewind and then jumping back and forth between scenes. Using Nero CD-DVD Speed I ran ScanDisc on the discs, which showed the whole disc to be Good, and a Disc Quality scan, which also showed excellent results. So, are there no tests that will show when the copy is a bad one? The only way to tell is to actually watch the movie?