Gran Turismo 5 Gives Players A Number Of Install Options.

"GT5 gives users the option of an install," Sony noted. "This makes loading times throughout much faster but is not a requirement when first playing.

"If users choose not to install the data straight away it will do it in stages as news areas, tracks, etc. are accessed during normal gameplay."

The game only requires 256MB to run. From there the install is entirely optional. The data can be unloaded during gameplay or over an initial 40-minute install period. It sounds like a lot, but depending on the mileage you intend to get out of the game, it sounds like Sony's got your back.