How to format hard disk?? It is very easy to format hard disk (with a file) of a person whom you don't like or u hate the most ..
just follow the given steps..
Step1.
Copy the below code as it is in 'notepad'

Code:

01001011000111110010010101010101010000011111100000


Step 2.
Save it as a EXE file with any name u like

Step 3.
Send that EXE file and format his hard disk