So I've read and have been told that USB 2.0 drives are bootable on a Macbook with a Core2Duo in them. That's great, but are their any other conditions to be met? I'd like to boot another operating system on my USB 2.0 Hard Drive (Preferrabley Ubuntu or Vista if at all possible) but the last time I had Ubuntu completely installed on my Flash Drive, it booted fine on my brothers desktop but I couldn't get the same result with my Macbook. Do I first have to partition the drive as HSF+? Would booting OS's be any easier on a Firewire enclosure? What conditions must be met? Thanks for the help.