Lets say u have really cheap low quality media.(ie, CompUSA, Kyphermedia, Supermediastore brand, etc.) And you know that chances are that it will result in a coaster. If you want a better chance to backup a dvd successfully without freezing, I suggest u use dvd20ne AND set the final size to something less than 4 gbs...like 3.7. I tried this... the picture quality was only slightly slightly SLIGHTLY worse, I managed to milk cheap pieces of media Shxx for all their worth.