SYNOPSIS
grub-install [OPTION] install_device
--root-directory=DIR
install GRUB images under the directory DIR instead of
the root
directory
grub-install copies GRUB images into the DIR/boot directory specfied by
--root-directory, and uses the grub shell to install grub into
the boot
sector.
Alternative wäre dann irgendwie
mount /dev/soundso /mnt
grub-install --root-directory=/mnt /dev/hda
Klaus