[cheekypaul]

Are you getting any access at all? Do you get the message "this disc is unreadable by osx" (or similiar)?

If so, it could be a mechanical fault. and it won't repair with software.
before you waste money on any software repair try a demo.
many recovery software companies will let you browse for possible files with the demo, try that 1st. good luck.

i've never recovered a file from an unreadable drive.