Question: how to create vfat partition?
Answer: Write the new partition info onto the disk with the w command, and exit fdisk. Make a vfat filesystem on the new partition by typing mkfs -t vfat /dev/sdc1 (assuming that /dev/sdc1 is the name of the new partition that you just created). It only takes a minute or two. Power down the disk or unplug it from the USB.