Mac Pro Not Reading Toshiba External HDD

I have a *Toshiba USB 2.0 Portable External Hard Drive (200 GB)*, and I've been using it just fine on my PC with Windows XP for months now.
I tried plugging it in today into my newly purchased Mac Pro, and it appeared just fine on my desktop, but when I double-clicked it to view the contents, my data and such was all there, but I couldn't access anything. If I opened up a folder to see it's contents, all I got was a blank folder with a spinning "Busy" graphic at the bottom right hand of the corner. No individual files would appear at all ever.
I would try disconnecting, re-plugging it in, and then at sometimes it wouldn't even register on the desktop. I had to try various USB ports on the Mac Pro to hope and try to get it to re-appear again.
One time I was actually able to view all the contents on my harddrive. I tried to access an MP3 on there, it loaded up iTunes, but iTunes locked up on me, and I couldn't close out of it nor eject my hard drive.
When I "Get Info" on my external hard drive icon on the desktop, the format is MS-DOS(FAT32).
I am running Mac OS X version 10.5.2.
Any ideas of what the problem is? I am absolutely stumped and upset.

I am having the same problem with my macbookpro. However, I am not even getting a desktop icon--i.e. its not even mounting. It doesnt show on the disk utilities, nothing. I have power, according to the led on the drive. The usb portworks on my iphone, and with myprinter. What gives?
Andrej, any thoughts?
To the originator of this thread, have you gone to your disk utilities and formatted it?

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