Vista - Goofed up GPT partition table... Data Lost?

I have a 320 GB drive in a USB external converter (the big plastic shell
that turns any IDE drive into a USB 2.0 drive).

I did something I shouldn't have done, I just pulled the plug instead of
doing the nice "safely remove hardware" I guess they really mean it.


Here's the sequence:

1. Vista doesn't remount the drive, it's found in Disk management as 800GB
??

2. Installed Disk rescue. It was able to locate some data (after a few
hours) but not nearly all of it. .

3. Rebooted box, lengggggthy checkdisk autoruns, and fixes tons of journal
entries and lost chunks.

4. Drive letter shows up. Disk management says there is a 320GB partition in
a 800GB drive. Files and folder structure show up, but filenames point to
different data! Like clicking on one MP3 starts playing another MP3, and I
even hear overlayed MP3's and what sounds like sped up voice (yikes)

5. I ran another checkdisk now, with switches /f /r /x /b, but the same
result, filenames (and even their thumbnails) are correct, but they point to
the wrong data