Does it use its own memory card or a regular memory card?
If it uses it's own like the older versions did, then just erase a game or two that you don't own. By game I mean the entire entry for the game. Or if it just uses a regular memory card then delete some stuff off the card that you don't need or go buy another card. GT4 is a memory card HOG.
They ought to write that on the Gameshark box or in the instruction manual.
