grub-install的另类用法
mount /dev/hda1 /mnt
mount -o bind /dev /mnt/hda1/dev
mount -t proc none /mnt/hda1/proc
chroot /mnt/hda1
grub-install /dev/hda
mount -o bind /dev /mnt/hda1/dev
mount -t proc none /mnt/hda1/proc
chroot /mnt/hda1
grub-install /dev/hda
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