My preferred file-recovery technique is through the command-line, using the dd tool built in to Mac OS, with the conv=sync,noerror options, but... that's not for everyone (and must be done carefully in order to not make things much, much worse). Image may be NSFW.
Clik here to view.
I don't actually have experience with Mac OS data recovery software beyond that... Others here might have opinions/experiences to contribute, or try your favorite search engine to seek out data recovery software for Mac OS.
The best approach is really to have good backups, though... to avoid the need for data recovery.
Good luck!
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Darius
