You can use a data recovery service, which will cost you lots of money, or you can try to connect the hard drive to another computer and see if it can be accessed.
If it s recognized but can't be accessed you may need a Data Recovery software, such as GetDataBack which seems to have good success around here.
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Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.