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Prevent hacking the grub.conf using a 'live rescue' from a live linux iso

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http://unix.stackexchange.com – It happened that I had set the grub password in grub.conf. But, using a live linux iso, I was able to delete the password from the grub.conf. Please read the steps for the same mentioned in this link: http://gofedora.com/how-to-recover-crack-root-password-grub-locked/ Instead of editing menu.lst, I edited the grub.conf. Rest all steps same My question is: Is there a way to prevent such a hack. When I tried rescuing, the system showed a message that if it is not able to rescue (i.e. if it fails mounting the HDD under the directory: /mnt/sysimage), do I want to continue/skip/abort. So, I feel (HowTos)