To permanently erase a hard disk, you can use a disk wiping tool or utility. Disk wiping tools are software or utilities that erase the data on a hard disk by overwriting it with zeros, random data, or patterns.
There are various disk wiping tools available for different operating systems. Here are some steps you can follow to permanently erase a hard disk using a disk wiping tool:
Download and install a disk wiping tool on your system. Some popular disk wiping tools include "Darik's Boot and Nuke" (DBAN), "Eraser", and "CCleaner".
Boot your system from the disk wiping tool. You may need to create a bootable USB or CD/DVD with the disk wiping tool and set your system's boot order to boot from the bootable USB or CD/DVD.
Follow the instructions of the disk wiping tool to select the hard disk you want to erase and start the wiping process.
The disk wiping tool will erase the data on the hard disk by overwriting it with zeros, random data, or patterns.
When the wiping process is complete, the hard disk will be permanently erased, and all the data on it will be unrecoverable.
With these steps, you should be able to permanently erase a hard disk using a disk wiping tool. Consult the documentation of the disk wiping tool you are using for more information on how to use it.