I still have a large NTFS partition and was wondering how I could write to that drive. It was exceedingly simple. First, login as the administrator user (if you’re the only user on the computer, that’s you), and type in the console:
sudo aptitude install ntfs-3g ntfs-config

And if you’re one of those GUI junkies, just use Synaptic to select the two packages ntfs-3g and ntfs-config. Then accessing the Applications » System Tools » NTFS Configuration Tool will allow you to set what drives should be mounted with write permissions. That simple, and it can all be done from the GUI if you so wish.

To change your settings, you have to go to Applications » System Tools » NTFS Configuration