Unformat Seagate external hard disk

The first reaction of most of us when format the external hard disk accidentally may be unformat it. But I have not heard the unformat tool yet. It does not mean we will lose those files forever. Though there is no unformat too, we can access those lost contents by restoring them. Yes, it is true that we can recover the data form the formatted external hard disk. What’s more, it is not sophisticated. Here is an example of my students who format his external hard disk by mistake.