A long time ago in a galaxy far, far away, I did some backups with DVD X Copy. That was ok but I messed up and put labels on them. When I checked them recently, over half were unplayable, and no, I'm not going to spend hours removing labels. When I tried to backup the ones that were still readable, as they start analyzing, I get an error message in Shrink that says "Invalid DVD navigation structure". Then when I rip them to an ISO with Decrypter and try to open them with Shrink, I get "Invalid UDF filesystem". What am I doing wrong?