Program to fix corrupt data

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My external hard drive started to fail before Christmas, and I managed to backup a DVD's worth of data (4.3Gb).

However, the data I backed up seems to be corrupt. Every file looks perfectly fine, and is the correct size, but I just get error messages e.g. "Acrobat could not open the file because it is not a supported file type, or because the file has been damaged".

Is there a program available that could possibly fix 4.3Gb of corrupt data?
 
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Can Preview open up those acrobat files?
 
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Alexis
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Nope, 'fraid not. Another error message about it being corrupt.

There's a mix of JPG, PSD, EPS and Quark files in the data. Occasionally a file will open, but the vast majority are corrupt in some way.
 

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