Things You'll Need
Instructions
Insert the memory card that you wish to format into your GameCube console. Turn your GameCube on. Go to the Main Menu, and select "Memory Card Screen." If your memory card is corrupted and requires formatting, a window will pop up asking if you wish to format your memory card.
Select the "Yes" option in the format confirmation window using the thumb joystick on your game controller. Press the "A" button. A second window will appear reminding you that all data previously on the memory card will be permanently erased. The window will ask if you wish to continue with the formatting.
Use the thumb joystick to select "Yes" and press the "A" button once more. This will begin the formatting process. This may take a couple of minutes, depending on your GameCube console. When the formatting process is completed, your memory card should be ready to use.