In OS X, why does one external HD mount as fusefs and another as ntfs?

Question

I'm on a Mac running Snow Leopard with the old/free version of MacFUSE and NTFS-3G. I have one external harddrive that was pre-formatted in NTFS and mounts itself with fusefs, so everything's great. I just added a 2nd hard drive that I repartitioned and formatted in Windows XP with ntfs, which my mac mounts using a read-only ntfs driver.

Why are the drives being mounted differently, and how can I get the new one to use ntfs-3g?

Thanks!

(Here's the output from a mount command, if it's relevant)

/dev/disk2s1 on /Volumes/OldDrive (fusefs, local, nodev, nosuid, synchronous)
/dev/disk1s1 on /Volumes/NewDrive (ntfs, local, nodev, nosuid, read-only, noowners)

Answer 1

Short answer: running a simple chkdsk /f in Windows on the incorrectly-working drive fixed a number of errors and allowed the drive to work correctly again.

Longer answer: Manually calling ntfs-3g on the drive (i.e. sudo ntfs-3g /dev/disk1s1 /Volumes/MountPoint) gave me a much better error message--one that told me to run chkdsk in Windows!