Instructions
Insert your PS2 memory card to a memory card slot on the front of your game console.
Press "Power" to turn on your PlayStation 2 game console.
Select the "Memory Card" menu option.
Select the icon for the memory card you inserted to your PS2 from the menu on screen.
Select "Yes" when you are asked whether you would like to format your PlayStation 2 memory card. Your PS2 memory card will be formatted and your console will be able to read from and store data to the card again.