Unsupported format

I have been backing up my movies for a while now.The last couple of times I have tried using DVD XCopy Express it finishes and says burn completed sucessfully but when I try to play the movie back it say that there is a disk with an unsupported format in the drive.I tried burning using DVD Shrink and then DVD Decrypter to burn the image to a disk.Sometimes it works and sometimes it doesn’t.One time it said the format problem and wouldn’t play on my computer but played fine on my Initial portable DVD player.Any ideas what is going on here?Thanks…

I forgot to put my burner in.It is the Liteon 812S 8X.Ritek g04 4X DVD-r.