I am backing up my DVD collection to my hard drive to make a movie server. Some of the movies have multiple copies of the movie on them. I haven't viewed the different versions of the movies, although I have started them to see if there is a difference. They appear to be the same. Most of the movies are close to the same size, although a few, like the Simpson's Movie, has one that is 1.4GB and one that is less than 1GB. I realize that this isn't an AnyDVD issue but I thought that you would be the experts. These are not special editions versions. There is only supposed to be one movie on the disc. They are R1. Why are there multiple copies on these discs? Thank you.