I am trying to use a 256GB USB but it doesn't look like you can format a drive this large using the FAT method which is supposedly required in order to work. That said, I see a ton of recommended USB drives for the sentry/dashcam that are this size. Has anyone had any success using one this large and if so, how did you format it? The car won't recognize it and Windows won't allow a FAT format of a drive this big. I must be missing something here.