Internal Lacie drive not mounting

Hello,
I am having trouble with my lacie drive. I mounted it internally because the firewire port went bad. The lacie was working fine for about 1 month and now it won't mount. It shows up greyed out in the disk utility and when I try to repair permissions I get this message:
Verify and Repair disk “LACIE”
** /dev/disk0s1
** Phase 1 - Read FAT
** Phase 2 - Check Cluster Chains
** Phase 3 - Checking Directories
Unable to read directory (Invalid argument)
Error: The underlying task reported failure on exit
1 non HFS volume checked
1 volume could not be repaired because of an error
***Would anyone be able to figure out my next move? I have a lot of data on this hard drive and it is currently Inaccessible.
Thank you!

It looks like the FAT file system is corrupted and beyond the ability of Disk Utility to repair it.
I think you should try another disk repair utility. A discussion at macosxhints.com says Disk Utility can't repair FAT file systems and suggests DiskWarrior:
http://forums.macosxhints.com/showthread.php?t=58708
I use Techtool Pro (the "pro" version of Techtool Deluxe that's bundled with AppleCare) but I'm not sure if it can repair FAT file systems, either.
I strongly recommend that you back up the data on the disk and reformat it as HFS+.
MacBook Pro   Mac OS X (10.4.7)   2.16GHz 2GB RAM 256VRAM

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