I've already mastered the movie backup process using DVD Shrink and Decrypter...but I have run into a road block with my navigation DVD for my car. I bought my navigation unit a little while back and the disk no longer works! I tried getting a new one from Pioneer...but they want $199!! Anyway, it appears as if my computer can read all the files....so I was hoping to make a backup =) I was able to save everything as an .iso file...but DVD Shrink keeps spitting out "Invalid DVD navigation structure" Is it possible to "shrink" this DVD to 4.7 or has this not yet been mastered? Any help is greatly appreciated.