External Drive crash on Macbook Pro

I don't know which category I should put this on. I wish somebody can help me.
My friend has an external hard drive - 500 GB, FAT 32. He actually uses a PC. He connected his hard drive to a Macbook Pro (Leopard). After get it back, he found nothing in his hard drive but .trash and .spotlight-V100 as hidden files. However, it still says that he has 450 GB on the hard drive.
What he is doing now is blaming all problem to be Mac's fault.
Do you guys have any idea what is the cause of the problem and hopefully how to bring those data back?
Thank you a lot!!!

I doubt that anything would have happened on the mac without his specific permission. Unless your friend opened up Disk Utility and altered a whole bunch of settings?
Try connecting the drive to the Mac and right click on the drive and "Get Info" and see how much free space there is. Then, connect it to your PC and check to see how much free space there is. That way, you'll know whether the data has been physically removed from the drive OR if it's just hidden for the time being (for whatever reason).
EDIT: Updated to reflect that I too have Leopard
Message was edited by: MBP Tyler

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