On the latest Apple computers, FireWire 400 and 800 ports have been superseded by Thunderbolt – a new, high-speed serial interface developed by Intel and Apple.
Focusrite has announced that their Saffire FireWire interfaces can be connected to a Thunderbolt-equipped computer using a FireWire 400-800 cable (included with all Saffire interfaces later this year) and the Thunderbolt to FireWire 800 adapter, available inexpensively from Apple and third parties. Saffire interfaces are 100% compatible with Thunderbolt using this adaptor.
The adaptor provides up to 7W of DC bus power as well as full signal connectivity: this should be sufficient for most interfaces but Focusrite recommends using the included power supply with your interface for best results.
Focusrite will continue to fully support the Saffire range for the foreseeable future, and will support the use of Thunderbolt/FireWire adaptors. If you upgrade your computer to one with Thunderbolt, you can continue to use your Saffire interface as before, and if you buy a new Saffire interface it will work with Thunderbolt-equipped computers.
See the Focusrite site for details.