Halo 4 the game which is in the talks will not get access to the Xbox 360′s which have less than 8GB for Storage.Whether you buy the Xbox 360 Core or Arcade System 8GB is must and without it you will not get any access to its multi-player mode.Microsoft confirmed this news by posting the following lines on their Console Blog:
“ At a minimum, you’ll need at least an 8GB USB Flash Drive or an Xbox 360 Hard Drive to play Multiplayer mode in Halo 4. For an optimal experience playing with an Xbox 360 Hard Drive is highly recommended. For Xbox 360 4GB, Arcade and Core consoles, the Xbox 360 Hard Drive is sold separately.
Actually 8GB is not the deal and as compared to today’s PC games its nothing in front of it.You can expand the storage or you can use 16GB flash drive as the 8GB only provide near about 7.8 
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