Gran Turismo 5 game data

I have finally been able to play Gran Turismo 5 after four years in development. It gives you the option to store 8GB of track and car data onto your PS3 hard drive. This is definetly worth doing as it runs much quicker in the game. When you enter into the game, it gives the option to do so. If you have not got enough room remove GT Prologue's 8GB file!!! To do this go to Saved Game and scroll upwards to Game Data Utility, find the GT Prologue image and delete the file.