Instructions
Connect your Western Digital Passport drive on your computer. Plug-in the USB cable and power cable to connect it.
Open "My Computer" on your computer. Click on "Start" then "Computer."
Right-click on your Western Digital Passport drive and click "Format."
Select "FAT32" in the "File system" menu.
Click "Start." Wait till the progress bar is done. This will format your Western Digital Passport into FAT32. You can now use your Passport on your PS3 to backup your data.