TestDisk is powerful free data recovery software. TestDisk is a very good, completely free program designed to recover data on hard drives. The application is intended primarily to help in the recovery of missing partitions and / or to enable or disable the bootable disk. TestDisk is powerful free data recovery software! It was primarily designed to help recover lost partitions and/or make non-booting disks bootable again when these symptoms are caused by faulty software: certain types of viruses or human error (such as accidentally deleting a Partition Table). Partition table recovery using TestDisk is really easy.