[CentOS] NTFS and elrepo

I have here a box which I dual-boot between CentOS 5.4 and an older version of that "other OS" that I'm using to check out the ELrepo version of kmod-ntfs. After installing as per the directions on the ELrepo site, I can mount an NTFS filesystem, and when I type "mount" with no options the output tells me that the target filesystem is mounted read-write. However, when I try to create a file on that filesystem as root, I get a "Permission denied" error, which leads me to think that I'm missing something here. So far, Google has not been very helpful here, so if anyone can shine some light on this, it would be welcome.