Help ! All music files disappeared at once on 5G 80Giga

Hi,
All my music files on the new iPod 80G disappeared at once from the iPod when I tried to sync a video from the Movies Tab in iTunes 7. No warning message, nothing. iTunes hanged up twice (did a soft Escape to get out of the rainbow wheel of death). When I opened the iPod, POUF, all was gone, and for good, it seems. More than 55 gig of music files went down the drain (no, they were not on iTunes on the computer... Hard disk space is too scarce to spend 50 gigs only on music).
What happened? I tried to recover the files using Disk Utility (no problem found). I tried to get rid of a potentially corrupted iTunesDB (didn't do anything to make the music files reappear on the iPod). The general info notes that the iPod unused space is now more than 73 Giga, whilst it was 75% full before the crash. I can't believe 55Gig of files can be erased in less than 2 minutes. They must be somewhere on the iPod drive but TechTool Pro and Drive Genius didn't find anything (Drive Genius reports a corrupted HFS+: rror : Read error whilst trying to read the Wrapper Master Directory Block
Error : Read error whilst trying to read the HFS+ Volume Header block
Error : Invalid HFS+ signature found in the volume header (0000 - ).
Error : Invalid HFS+ version number in the volume header (0).
Error : Invalid HFS+ allocation block size found in the volume header (0).
Error : Invalid HFS+ total block count found in the volume header (0).
Error : Invalid HFS+ resource fork clump size found in the volume header (0).
Error : Invalid HFS+ data fork clump size found in the volume header (0).
Error : Unable to get the HFS+ volume header.
Beside the disappeared music files. All the other iPod functions work as usual.
Any idea how to get my music back?
Cheers,
Ebara
MacBookPro 15", iPod G5 80G, iMac 20" Mac OS X (10.4.7)

That's correct.
If you want to move them permanently over, follow this article to copy your Itunes folder over:
iTunes: Back up your iTunes library by copying to an external hard drive
http://support.apple.com/kb/HT1751
After you have moved, you may go and look under this iTunes folder structure and check if your movies and Music are there:
If you music are stored at a different location, you have to move them to the same location on your new drive as well.

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