Instructions
Connect your Sony PSP to your computer using the USB data transfer cable that came with your unit. You can plug this USB data transfer cable into any USB port on your computer.
Turn on your Sony PSP. Select "Settings" from the menu. Select "USB Connection." Enabling this will allow your Windows operating system to recognize your attached Sony PSP.
Turn on your computer. Click the "Start" button.
Click "Computer."
Right-click on your Sony PSP&'s icon in "Computer." This icon represents your memory stick and not the unit&'s own internal storage. Click "Format." Click "Start" to format your Sony PSP&'s memory stick, which will clean up all of the deleted files from the device.