Things You'll Need
Instructions
Connect the PSP USB cable to both the PSP and your computer. Turn on the PSP and wait for your computer to detect it.
Copy all data from your PSP's memory stick to a folder on your computer by selecting everything on the memory stick and dragging it into the folder.
Disconnect the USB cable from the PSP.
Navigate to the "Settings" selection on the PSP's dashboard. The "Settings" menu can be found on the far left side of the dashboard options.
Select "System Settings" from the "Settings" menu, then "Format Memory Stick," and select "Yes" when asked to confirm your selection. This will format your memory stick with the FAT32 file structure, which will allow for more flexibility when using the memory card.
Reconnect your PSP to your computer via the PSP's USB cable. Transfer the data you backed up in Step 2 back to your PSP by selecting all files, then dragging and dropping them into the memory stick folder.