you can simply look up your DVD drive's model and see what the specs are for finding that out. Is the information currently in raw DVD format or in an ISO? If it is in raw format, you need to get it into ISO form. Pcg Edit is a program that takes your raw DVD information and makes it an ISO. It automatically finds the Dual Layer break if it was from a DL. That makes it so when you burn the image to a DL disk you wont have errors with the layers.