When it comes to system requirements, Gran Turismo 5 (Store version) requires around 2.2GB of disc space but the Blu-Ray version might bring this number down. The demo of this game was launched in Japan during October, 2007 and it only featured the Suzuka race track along with 7 cars. If you are wondering what the ''Prologue'' in Gran Turismo 5 Prologue means, it is there as a self- reference to GT4 Prologue which was launched before GT4 for PS2, of course things have changed for the better since previous versions.
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