Formatting your hard disk with Killdisk will remove all the data from it permanently. If Killdisk software is used to format the hard disk, the data cannot be restored. This is particularly useful when a computer is rendered unusable due to virus attacks. It is possible to download Killdisk for free from the internet. Once downloaded, Killdisk must be burned into a CD. In order to format the hard disk with Killdisk, the computer must be booted from the CD on which Killdisk has been burned. Upon completion of the formatting, Killdisk will generate a report of the activity.
Killdisk is used to totally format data from your hard drive. When it is used there is no way of restoring your data. Killdisk is really useful if you get infected by some viruses, which will format everything!
To be able to use Killdisk you must burn it and then boot it when starting your PC.