Problems backing up Return of the Ring...please help!!!

Hi,

I am new to this board and this is my first post.

I reacently purchased the extended edition of the return of the king and I want to back it up. The first dvd worked fine...I am using DVDxCopy. the second DVD wouldn't burn at all. I think its because the dvd is like 4.66 gigs and there wasnt enought room...but im not sure...I have backed up many movies before and hadn't had any problems with it before.

any suggestions?

thanks,