Try plugging the Hard drive to another computer as mentioned in the above post.
If the Hard drive is detected on it, then you may need a "Data Recovery" Software which would recover the full data. There are some softwares available on the net but the Trial versions have limited functions.
If the Hard Disk is damaged and the drive is not detected, You may not be able to fix it at home. It can be repaired by fixing the "Head" for which you will have to seek a professional help.
Sathyan
