How do I format a Flash Drive to FAT16?

I was able to format a 2GB flash drive to FAT16 using Terminal, but I can't figure out how to format the 8GB drive into 4 partitions, FAT16. Too many arguments or not enough... can't seem to get the correct number.
Could someone please tell me what the command line would be? Thanks!

Started experimenting with a 4 GB DMG instead, initial results...
diskutil partitionDisk /Volumes/FAT16b MBRFormat "MS-DOS FAT16" "PART1" 1860M "MS-DOS FAT16" "PART2" 1860M
Started partitioning on disk disk7
$<3>Creating partition map
$<3>Formatting disk7s1 as MS-DOS (FAT16) with name PART1
$<3>Formatting disk7s2 as MS-DOS (FAT16) with name PART2
$<3>[ \ 0%..10%..20%..30%..40%..50%.......................... ]
Partitioning encountered error on disk disk7s2: The chosen size is not valid for the chosen filesystem (-9962)
Not sure why it gets half way through the second partition, even if I lower the values.

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