How do you fix a hard drive crash?

You cant really fix a "hard drive crash". In the data recovery business that term is used to describe a particular problem when the mechanism inside the hard drive "crashes" or scratches the surface of the platters/disks where the data is stored. There are other types of problems that can be corrected when a hard drive fails but this is not one of them. http://www.interdatarecovery.com/index.php/5-steps-to-recovery