Calm down. I have had this happen to entire chapters of novels I have written. Guess what happens if the files can't be recovered? You get to reshoot those scenes, fix mistakes, and refine the quality of your work. The second time I wrote those chapters I wrote faster and ended up with a better story than if the originals were never lost.

The story is in you. You don't need the hard drive. Tell people you had an epiphany and are going a different direction with the project.