http://www.macnn.com/articles/07/03/26/apple.tv.ext.usb.startup/
Apple TV: drive upgrade, external USB boot
updated 09:00 pm EDT, Mon March 26, 2007
Apple TV: ext. USB startup
In Brief: In addition to a step-by-step drive upgrade tutorial (without third-party utilities) for Apple TV, one user has posted video showing Apple's newly launched set-top device booting off an external USB hard drive, using Menu + '-' keys to place the machine into recovery mode. Another user has managed to enable Apple Remote Desktop, the company's remote Mac management utility as well as install Apache, the open-source web server software. Users have also managed to enable SSH and AFP to remotely connect to the device via the terminal and or the Finder (respectively).
