GTA V comes with a mandatory install for both the PS3 and Xbox 360 with the latter version coming with two disks. The first is an install disk that puts 8 GB worth of data on either the Xbox 360 hard drive or a USB flash drive. The second is the "play" disk which needs to be inserted whenever you want to play the game. However, Rockstar recommends not installing that second disk.
"For optimal performance, we recommend not installing [the play disk]. We will have more info on our Support Site at launch," the Rockstar Support Twitter account wrote.
This combination of an install disk and play disk is not unique for the Xbox 360 as Forza Motorsport 5 also came with dual disks. However, recommending not installing the play disk is somewhat new. The next closest example to installing a game on the hard drive degrading performance would be Halo 3. The game was optimized to stream data from the disk which was somehow thrown off when it was on the hard drive. That appears to be the case with Grand Theft Auto V.
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