http://www.ign.com/articles/2013/07/16/xbox-one-digital-games-playable-during-installation
UPDATE: Microsoft has confirmed to IGN that users can also begin playing games during disc-based installation. A representative tells us, "Whether you are downloading a game digitally or from a disc, the game will be downloaded in segments. Once the required data –a fraction of the entire game – is on the hard drive, you can start playing while the rest of the title finishes downloading in the background."
Microsoft has revealed that Xbox One digital games will be playable during installation.
In a statement to Engadget, Microsoft said, "Consumers will be able to sign on to any Xbox One console and have access to all their digital games. Once the required data – a fraction of the entire game – is on their hard drive, they can jump into the action while the rest of the game finishes downloading in the background."
Disc-based Xbox One games, you may recall, can be accessed instantly when installed, so long as the game is in the console.
Sony recently elaborated on a similar feature for PlayStation 4, saying, "Chunks [of a game] are automatically copied to the hard drive in the background...after the first few minutes your game can rely on having faster read speeds from the hard drive, which provides a better experience for players. And this is a completely background process for the player. They don’t have to wait for anything to install before playing the game. The game will launch as soon as the disc has been put in the drive."
