There is more than one way to format in FAT32 and it's best to avoid windows for doing it for a garmin device internal memory. RMprepUSB is the only reliable method to use in modern Win OS versions when formating Garmin devices because the built-in tool can cause format errors and you should also not use any flavor of Mac. RMPrepUSB is available in this thread: [Only registered and activated users can see links. ]