[header] How to boot a mac from firewire [title] Locate your mac computer's firewire port. [step] It will usually be located near the usb port and will be just a bit narrower and taller than usb ports, with angled corners on one side of the port. [title] Plug the firewire connector for your firewire drive or device into your macintosh computer's firewire port. 
[title] Hold down the " option " key as you power your macintosh computer up. [title] Select the firewire drive from the list of available boot-up options that displays on your macintosh screen.