Mac Pro  -  Reads USB Drive only in Windows

For the past couple weeks I have been sharing 'Word' documents on a USB drive using both Windows and Mac OS platforms. A couple days ago the Mac side of the computer stopped recognizing the USB drive. It does even show the drive on the desktop. I tried putting the drive in the other USP port. This didn't help. When I turn on the Windows side, using XP, the drive works fine.
Am I doing something wrong? Can I use the same USB drive to share files? Or, do I need try another way to share files between platforms?
If this doesn't work, I was thinking of putting my files on Google Documents and accessing almost everything via the Internet.

I recently had the reverse happen to me. I had a FAT formatted flash drive that I would frequently put into a device that needed non-Mac. I also used to use it a lot with Windows - Mac transfers. Plugged it into a Windows computer and it said it needed formatting. The only think I can think of is occasionally something gets written to the drive in a form that the other system can't handle. I'd copy off any files that are valuable then reformat the drive to FAT and see if it then works.

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