Recommendations for HDD recovery when trying to save video files!

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Joined: Oct 17 2007
I had a friend who recovered footage, and  the resulting footage seemed as if it was corrupt (not able to import into premiere / or play)
Is this just a case of using a bad recovery company, or is it hard to recover video files - resulting in corrupt / useless files!
If people have had good / bad experiences please advise and also mention the company you used!