Instructions
Remove any game discs from the tray and turn on the PlayStation 2. Without a game in it, the Playstation should go to the menu screen. Select "Browser" by pressing the "X" button to access your memory card.
Choose the memory card you need to erase. Use the arrows on your PS2 controller to select the memory card picture and press "X." If you click the wrong one, press "O" to go back to the previous screen.
Scroll through the game profiles with the arrow keys. Select the game or other profile you want to delete and press "X." A screen will appear giving you details about the name of the save file and how much space it currently takes up on the memory card.
Select the "Delete" option and press "X." After the game has been deleted, press "O" to return to the list. Repeat these for all items you want to erase from the memory card. After you are finished, you can turn off your PlayStation 2.