Large (toc) DVD-r backup problem!

[magnificint]

I have a Pioneer A-03,and had success making DVD-r backups of Pac-man world and 007 Agent Under fire whith Nero 5.5 and Primo(updated)DVD burning programs,but no luck making a backup copy of Omimusha.I'm sure is not the DVD-r's because I
alredy made successful backups of other games,I think it could be because of the size of the games (toc) but not sure,since pac-man and james are less than 2.00(toc) and Omimusha is more than 4.00(toc). Is there a diferent process of making a DVD-r backup whith large(toc) or if someone had the same problem and manage to make a backup of Omimusha (or other game with a large toc),plase let me know how.

Thank's.