It sounds like that your drive is corrupted. To recover your data back, you absolutely could use a drive recovery freeware that can recover all your data back. It is worth a shot.
In the future, you should learn to back up all your important data all the time.
i have lenevo e430... it is not booting up and showing HHD0 error.... i talked with the customer care guy.. he is saying that my hardisk gets corrupted... now what can i do recover my data... tell me asap..