Only turn off the console when you are actively running around in-game, never while the typewriter saving animation is on screen.
: Nintendo's largest official memory card (the white Model DOL-020, 1019 blocks) uses a different timing cycle that occasionally causes data corruption in specific games or on older console configurations. save data resident evil 4 gamecube fixed
Load your game and savestate, then use an in-game to save properly to the new card. Only turn off the console when you are