Apple's Thunderbolt to Firewire Adapter allows you to connect your Thunderbolt-equipped Mac to a FireWire device. The adapter is small and compact, and connects to the Thunderbolt port on your Mac computer. This provides a FireWire 800 port that supplies up to 7W for bus-powered peripherals like hard drives and audio devices. This adapter is compatible only with Thunderbolt-equipped Mac computers running OS X v10.7.4 or later.
Thunderbolt to Firewire Adapter