Hi Sonic,
If it is physical damage then it needs Data Recovery Lab also called '''CLASS 100 CLEAN ROOM ''' where the disk is opened by the Data Recovery Expert. Such types of labs are very rare available. I suggest please don't hit & try by self or allow to open the disk by local mechanics else it might be permanently loss of Data. If it was Logical failure then i will also suggest you some software's.
You can read complete details about Hard disk recovery process & Why CLASS 100 CLEAN ROOM required in Physical damage.
[http://www.stellarinfo.co.in/services/hard-disk-recovery.php|http://www.stellarinfo.co.in/services/hard-disk-recovery.php]