safe recovery

The use of a good data recovery software is sufficient If your result is not satisfactory,  especially do not run its hard drive, the risk of blocking it permanently. 

it may not be recognized with good values by the system, with some abnormal noises see excessive vibrations. Hard disk playback can be slowed down considerably with voltage drops. 

The hard drive is usually not recognized, it rotates abnormally, it accelerates, stops or slams heavily. If the hard disk has fallen to the ground in full write, a disturbing noise of friction may add to the symptoms.