Things You'll Need
Instructions
Turn on your Sony PSP and make sure the memory stick is inside of the PSP's memory stick reader.
Select the "Settings" section of the PSP main menu, which is on the left side of the menu. Select "System Settings."
Select "Format Memory Stick" from the settings page and select "Yes" to confirm that you want to format the memory stick.
Connect the PSP to the computer using the USB cable and select "USB Connection" from the PSP's main menu. The computer will recognize the PSP memory stick and you will be able to save files to it again.