The one I'd recommend trying is:
PhotoRescue Home Page - PhotoRescue Wizard, PhotoRescue Expert, PhotoRescue Advanced
Free to try and you should see thumbnails of what it could recover.
Do not tick the box that says to cache the disk before searching in your case (as it would try and copy 80 gigs)
If that doesn't work then it's pretty unlikely you could get the images back successfully I'd say. You could try the advanced version of it at a push as that allows you to start moving data blocks around to try and make pictures up from fragmented data.
See here for an example of what it does:
photorescue-menu-2004.gif