The question is why you are doing this? The speed benefits are not going to be noticeable with today's technology. You would be better off with NTFS And you do know that ther is no such thing as FAT you have choices of fat16 or fat32. The problem is that fat16 limits you to 2gb but then again if you are trying to use fat16 then your device is probably not larger than 2gb.
You should just be able to attatch the device to a computer and format it using windows.