Whenever we delete a file, it is not actually deleted from the disk. Operating system just marks those areas of hard disk as deleted. At that time, some undelete software like Glary Undelete and Recuva can easily recover those files. A file is safely removed from the disk when it is overwritten by another file. However, even after that, it might be possible to recover data by studying the magnetic fields on the disk platter surface! This can be a problem sometimes if you were trying to delete some sensitive data, and didn’t realize that it actually stayed on disk.
If you are disposing off your hard disk, then this software would come extremely handy. Just run this to ensure all the data on hard disk is safely deleted, so that you do not become a victim of identity theft if someone recovers the data from the hard disk.