How hard drive crash data recovery work is by reconstructing the dropped information on the harddrive.
It does not make any difference if your documents were wiped unintentionally or from the result of a crash, nearly all files is in many cases can be reconstructed and brought back to life and made usable again.
While most crashes are because of the Whole computer packing in or malware, there are some circumstances that result from appliance failure, including the actuator arm or platters not working correctly.
You won’t be able to use the harddisk when this happens, yet hard drive crash data recovery can resolve this problem.