Weird Issue: External Hard Drive disc space calculation error

Okay I just started having this weird error as far as calculating disc space. I added everything up and it reached 200GB out of 465GB but the bottom reads as no space left at all!
And when I go into the widget it will read 0 but the bar will show space left.
Any help getting this hard drive to read correctly.

Check this user tip I wrote:
http://discussions.apple.com/thread.jspa?threadID=122973&tstart=20
Also, what file system is the hard drive formatted in according to Get Info's Format field? Get Info can be gotten by selecting the drive icon on the desktop and going to File menu -> Get Info, or using Command-I (the letter pronounced "eye". Command is the Apple logo key on your keyboard).
Also is boot camp installed?

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