Burning large games

[The KeeN]

I have been trying to backup PGR 2. It is around 5.5GB.
I have managed to scrap the demo files but left all the folders. It is now small enough to fit on a disk.

The problem I have is that I use nero to burn my ISO's. When I try and burn it after I have created the ISO using craxtion, I get a block size error.

1) how do I correct that?
2) do I use a different program to burn with? what one?
3) have I done all the right things to start with?

Thanks