Just an update...Photorec is very slowly running, having many "error reading sector" messages. The estimated time fluctuates between 23000 hours and 31000 hours! Needless to say if it doesn't pick up pretty soon, I'll probably have to give up since several years is not realistic. But I might make another week or two. It is still in Pass 0, finally found 3 of 10 headers needed to begin...I'm crossing my fingers that it will find the other 7 needed headers and be able to get on with recovery before I lose my patience. My hard drive is in an external USB enclosure and I keep it sitting on freezer packs to keep it cool. Figure anything that reduces wear and tear on this physically failing drive is worth trying.