In root console run cfdisk with command "cfdisk /dev/sda" if sda is the disk you want to partition.
Use cfdisk to create a partition and change it to type 6 or e for fat16 or b or c for fat32, depending if you need it to run LBA or not.
Write the partition table, reboot to finalise the partition.
Then in a root console type
Code:
mkdosfs -F16 /dev/sdb5
if you want sda5 (previously created in fat16 type) to have a fat16 filing system. Use -F32 parameter instead of -F16 if you want it to be fat32.
You can proceed to use it.