2oThis guy wan't trying to cheat the game. He wanted to back up his progress on another card. That is not an unreasonable thing to try and do. And how the hell would he have known that he HAD to reset in order to save on another card? I highly doubt anyone would sabatoge their hard work on purpose or perhaps you feel he should have had a crystal ball.
Pull the stick out of your arse because you would be pissed if it happened to you.
You are not supposed to remove memory cards during gameplay in any game, period. Even the instructions for the PS2 etc tell you not to insert or remove anything whilst it's turned on.
There is a reason for this, as the topic creator has seemingly found out. And he should have known because he should've read these instructions. Hell, I'll bet even the GT4 instruction booklet tells you not to insert or remove the memory card whilst it's turned on.