access to /dev/hda denied

Hello everybody,

I use knoppix as quite a powerful rescue system. Unfortunately I have
just broken the boot sektor of my laptop and would like to rewrite it
with knoppix' lilo. Although I am logged in as root on a console, lilo
reports that access to /dev/hda was denied. What can I do gain access
to this device?

Thank you very much for any advice.

Regards,

Elias