Data Recovery Help

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http://www.linuxquestions.org – I'v been working on recovering data off of a 500 gig Western Digital USB hard drive. The drive is formatted with Macs HFS. The drive was about to fail and I was getting SMART errors all over the place. So I used the ddrescue tool and was able to extract about 260 gigs off the drive and store it as a backup.img Using tools like foremost and scalpel I was able to retrieve about 40 gigs of pictures, documents and various other files before both programs would freeze. (I ran each for about 24 hrs) I don't know how much further I can get with the chunk of extracted data. I can see the mac partiti (HowTos)