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Spot on, there's a few things you can't do with a 4gb console and this game, one of them is view replays. Below is the product description for FM4
Forza Motorsport 4 - Xbox 360 Game.
The definitive racing game of 2011, Forza Motorsport 4 brings together genre-defining, controller-based racing, the power and freedom of Kinect, and content from leading brands like Top Gear to create an automotive experience unlike anything before it.
Suitable for the Xbox 360.
•Important notice - This game will play in its entirety on any Xbox 360 console with over 2.8GB of free space, with the exception of the current (Oct 2011) 4Gb console.
•If you are playing this game on the current 4GB console, if you have 2.8gb of free space on your console you can play all cars and all tracks in the game.
•With the 4GB console you will not be able to replay or rewind during races, capture movie or large screen shots from your games or save game ghosts - this is where you drive on a track against a ghost outline of one of your previous races on this track. If you have any concerns, please call Xbox on 0800 587 1102.
•Forza Motorsport 4 will be the most expansive and vividly realistic automotive experience across any console, bringing you closer to the edge than you've ever been before.
•Through the power of Kinect, players will be able to step through the TV screen and jump into the drivers seat while the engaging controller-based experience will let you take on the bone-jarring physics, unparalleled levels of customisation, and rosters of dream cars and tracks.
•Offering game-play that will electrify racing fans and excite car lovers and novices alike, the highest-rated racing franchise of this generation returns in Autumn 2011.
•For ages 3 years and over.
•EAN/MPN/UPC/ISBN: 0885370309942.