I've looked endlessly on the web for information regarding the Thunderbolt to Firewire adapter for my MacBook Air 2012 running OSX 10.8. I just want to spread the word out to all, I own an M-audio Profire 610 audio interface, and can confirm that I am able to use it fully bus powered! I just made sure I installed the latest driver for the interface from M-Audio's website. Many places state that the adapter can only power up to 7W of power, I was afraid that it wouldn't be enough to power my interface without the need of a power adapter for the extra juice. But again, I am running the interface fully bus powered without any drop outs and all in and out ports are fully functional!.