I have kind of a weird question. I have the disk image file of Snow Leopard, but I do not have access to dual layer dvds, so i need a way to install snow leopard to my mac. Is it possible to create a partition on my external hard drive, restore the disk image file to that partition with disk utility, and then boot up into that partition to be able to install osx? Or can you even boot from an external drive? I just need a way to install SL without a disc. Is there any way to do this?