Grand Theft Auto V is the largest and most ambitious game Rockstar has yet created. In order to provide the best possible experience for such a vast and detailed world, the game will have installation and storage requirements.
Grand Theft Auto V has a one-time mandatory install. This initial install will require an Xbox 360 Hard Drive or an external 16GB USB flash drive with at least 8 GB of free space. If using a USB flash drive it must be at least USB 2.0 with a minimum 15mb/s read speed and formatted for Xbox 360 use. A new USB flash drive is recommended to ensure optimum performance.
Find out more about the Xbox 360 320GB Media Hard Drive: http://www.xbox.com/en-US/Xbox360/Accessories/HardDrives/320-GB-HDD
Find out more about the Xbox 360 250GB Console: http://www.xbox.com/en-US/xbox360/consoles/systems/Xbox360250GB