As a precursor to a Wiki entry, how exactly does USB host mode work on the 770? I'm aware that it has to be enabled via a command line argument under the linux/osx flasher, but then what?

If (assuming I had all the power requirements sorted out) I plugged my 40GB MP3 player into it, which is detected as an external drive by XP/Linux, would the 770 inherently know what to do with it?

Connectivity and power requirements are fine, but what about software/OS requirements.