Out of the box Linux can READ NTFS partitions but it cannot write to them.
If you want to be able to read and write safely check this out:
It's truely amazing, in that it utilizes Windows XP or 2000's own drivers in LINUX to provide safe access to your NTFS partitions.
I've moved huge files back and forth without problems and even performed diagnostics on Windows XP drives with this.
Note: You'll need access to either the XP install CD or a partition onto which XP is installed.
The installation mounts the NTFS drive in read only mode then looks for the Windows NTFS drivers.
It copies them into Linux and utilizes them to provide access from there on, to your NTFS partition.