I installed Arch Linux on my iMac in its own partition. I'm using rEFIt to choose from Snow Leopard, Windows 7 and now Arch as well. I already install grub on Arch's partition when I installed Arch, but do I really need it? First I have to pick Arch from the rEFIt menu, then pick it again in the grub menu (and there are two items in it: Arch and Arch Fallback). So do I really need it? And if not how can I get rid of it?