According to a recently released “Asked & Answered” by Rockstar, GTA V will require a 8GB mandatory install for both the PS3 and Xbox 360 due to it being such a high quality game.
“Grand Theft Auto V is the largest and most ambitious game we have yet created, and takes full advantage of every ounce of processing power available in the current generation of consoles. In order to provide the best possible experience for such a massive and detailed world, the game will have installation requirements on both Xbox 360 and PlayStation 3 systems.”
This mandatory install also means that the Xbox 360 version of the game will come with 2 discs. Disc 1 is an install disc only and Disc 2 contains the game. Rockstar says that 360 owners will not have to switch discs once the install is performed.
Rockstar also stated that the game can be installed on a USB flash drive. 360 owners need to make sure they have at least a 16GB USB drive with 8GB allocated for Xbox use to install the game.
Rockstar says fans of the series can expect gameplay for GTA V very soon or they could even wait until when the game releases on September 17, 2013.