Need help resurrecting an NTFS partition

[Benjamin J. Weiss]

Howdy!

I've got a friend with a USB drive that he says was formatted NTFS, using 
it with WinXP.  Unfortunately, he says that he hooked it up to a Mac, and 
that it started doing something weird.  He unhooked it, and now it won't 
show up in Windows.

I tried hooking it up to my laptop while booting knoppix-std.  I was able 
to do an fdisk -l, which is showing the drive as Fat32.  I tried running 
testdisk, which shows two FAT32 partitions, but I don't see any data.  I'm 
figuring that the partition table was changed at the very least, and 
possibly the file allocation table/master file table.

What I'm wondering is if somebody knows of a tool that I can try to use to 
recover his files from the drive.

Thanks!

Ben