DVD copying

[Bushette]

Hi I am wondering if someone can help me. I have been trying to back up the Simpsons Third Season with DVDX Copy but when I go to burn the second part of the disc it won't burn. The first part of the disc does with no problem. Anyway, I downloaded Shrink and compressed the disc but now I don't know how to burn it. I have Nero but when I load up the files it only lets in so many. What am I doing wrong? Thanks for your help.