Microsoft, through campaign optimization, has announced that to play massively multiplayer sector Halo 4 will require a mandatory installation to be carried out on a 8 GB storage device: among the solutions offered there are the normal installation on Hard Disk or USB pendrive 8 GB. Who is in possession of a Core model, Arcade or Xbox 360 4 GB is then warned: If you want to try the online title 343 Industries, you will need to use a HDD sold separately or a USB flash drive; for everyone else, just to free up some space.