Things You'll Need
Instructions
Insert the memory stick into the corresponding slot on your PSP.
Turn on your PSP console.
Select "Settings" > "System Settings" from Main menu and hit the "X" button.
Scroll through the menu options, select "Format Memory Stick" and press the "X" button. You will be asked to confirm that you want to format the memory stick.
Select "Yes" and press the "X" button. You will be asked if you really want to continue.
Select "Yes" and press the "X" button. The PSP will begin formatting the memory stick. During this time, do not remove the memory stick or turn off the PSP. After a few seconds, you will receive confirmation that the formatting has completed.