Need a more information. What boot loader are you using? The setup is different for lilo and grub. Which ever, please post the config file you have. Also open a konsole in linux and run the command 'df' and post the results.
The grub config file is /boot/grub/menu.lst . The lilo file is called lilo.conf. I don't remember the location, so if you are using it, you will have to find it. If by chance you are using some other boot method, please tell us what you are using.