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Description of problem: grub2-install --help doesn't list --root-directory as a valid usage. It looks like the code does allow for this option. This option is very valuable when recovering grub2 after another OS install, e.g. described here: http://ulyssesonline.com/2010/09/20/recover-grub2-after-windows-install/ Version-Release number of selected component (if applicable): grub2-1.99-7.fc16
--root-directory=/mnt/ is accepted for compatibility but is undocumented and not recommended. Instead --boot-directory=/mnt/boot should be used. Documenting this feature would just add confusion.