Halo 4 requires a minimum of an 8GB USB drive or an Xbox 360 hard drive in order to play multiplayer, the Xbox.com Halo 4 product page has revealed.
This means that anyone with a 4GB Xbox 360 will need to pick up a memory stick or hard drive in order to play.
The product listing adds: "For an optimal experience playing with an Xbox 360 Hard Drive is highly recommended."
Halo 4 will be released November 6.
With 16GB USB sticks readily available for well under £10 this isn't really that big a deal.