Clean/Erase hard disk drive from command prompt?

Steps:
1. Click on start button.
2. Click on run command or press "Window + R" key from keyboard.
3. Type "CMD / COMMAND" in this dialog box.
4. Click on ok button.
5. In the command prompt window type "Diskpart" then press "Enter" key from keyboard.
6. Type "List Disk" then press "Enter" key from keyboard.
7. Type "Select Disk 1" then press "Enter" key from keyboard.
Note: "Select Disk 1" means actual disk number you want clean.
8. Type "Clean" then press "Enter" key from keyboard.