You won't find other game formats on Xbox 360. All Xbox Live games, demos, trailers, movies and music can be played using a DVD-ROM drive as the media player. Movies will play from the front row of the DVD-ROM drive; the same way any other media player with a DVD-ROM drive will playback. You can also easily connect external drives and USB flash memory to the Xbox 360, and manage them just like the hard drive. And yes, games, demos, trailers and movies can then be played. Just don't change the disk or put the Xbox into standby mode while playing a DVD or the system will turn off.
If you're an Xbox Live Gold member, you already have access to a growing library of games, demos, trailers, movies and music. Go to My Games, My Games & Apps, My Games & Apps on Xbox LIVE Marketplace, or to Mgo.Xbox.com. And you'll also have access to the exclusive Game Preview program. With Game Preview, Microsoft will periodically host invites to view new games before they hit retail. The next-gen gaming experience is only a click away. And Xbox Live Gold members have access to 17 new releases in the exclusive XBLA catalog each month. 7211a4ac4a