A registry hack is needed to burn 4600mb or more.
I got this from DrageMaster:
Here’s the settings for 4650 MB.
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Ahead\Nero - Burning Rom\General]
be carefull with the registry.
If you don’t want to mess with the registry. Make an image with image recorder and burn with imgburn.