Instructions
Slide the memory stick cover from the card slot on the left side of the PSP.
Insert the memory card into the card slot until it clicks in place and slide the cover back onto the card slot.
Slide the power switch up on the PSP to power on the device and press the left arrow on the directional pad until you reach "Settings."
Press "X" to select the device's settings and press the down arrow on the directional pad to scroll down the Settings sub-menu.
Press "Down" until you reach "System Settings" and press "X." Press the down arrow to highlight "Format Memory Stick" and press "X."
Press "Down" to highlight "Yes" on the screen and push "X" to confirm you wish to format the memory stick.