NTFS Drive

I have a Maxtor 200 GB 7200 RPM hard drive that I had formatted in NTFS
when I used it on a Dell. It was my primary drive, with all my files in
it. Now on a Mac I can't see it in Finder. A few days ago when I had
hooked it up it appeared as a USB drive, and all the files, including
everything in the My Documents folder, were readable. Now, no matter what
I do (reboot, unplug and replug, etc.) I cannot get the drive to show up.
What can I do to open it?
Yes it does show up in Disk Utility. When I tell it to mount, There are two things that appear; one of them does not allow a mount and
the other says it cannot be mounted, that I have to try running First aid
on it then try mounting it, but all the options are grayed out. This
drive opened fine a couple of days ago and I haven't changed anything
since.
The file directory is okay. I opened it on a Windows system.
Any help?

MacOS X has only limited support for NTFS, in the sense that:
- It can only read, not write.
- It can't access if the partition has a password.
- It can't fix it.
- It can't format it.
- It will balk if there's anything wrong with the partition.
The main reason being licensing restrictions, NTFS is Microsoft-proprietary. You could try some third-party drivers, such as MacFUSE, to see if that improves reliability when accesing such a drive and even gain R/W access.
Update, re. V.K.'s post: if you do want to reformat for exclusive MacOS X access, note that Leopard's Disk Utility has a bug that impedes reformatting NTFS partitions. [Here's a writeup I did on how to get around the bug|http://discussions.apple.com/message.jspa?messageID=7783365#7783365].

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