Fat16 Format With Micro SD Card

I need to format a micro SD card from my Arduino micro sd reader to fat16. I followed an online tutorial like so:
diskutil list
Which brought up this list:
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *256.1 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh 10.7 SSD      175.0 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:       Microsoft Basic Data BOOTCAMP                80.2 GB    disk0s4
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *750.2 GB   disk1
   1:                        EFI                         209.7 MB   disk1s1
   2:                  Apple_HFS WD 750GB Black HD       749.8 GB   disk1s2
/dev/disk2
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *7.8 GB     disk2
   1:                 DOS_FAT_32 NO NAME                 7.8 GB     disk2s1
Then I typed:
diskutil partitionDisk disk2 MBRFormat "MS-DOS FAT16" NO_NAME 7.8G
Then it displays this:
Started partitioning on disk2
Unmounting disk
Creating the partition map
Waiting for the disks to reappear
Formatting disk2s1 as MS-DOS (FAT16) with name NO_NAME
Error: -69850: The chosen size is not valid for the chosen file system
Although it shows up in Disk Utility as: disk2s1, should I take notice of the Error: -69850 or does it mean I've done it wrong? Also I've tried different partition sizes and this error still comes up.
P.s. I'm using Mac OS X Lion.
Thanks in advance.

Hmmm, FAT16 or FAT32? FAT16 is limited to 4 GB...
http://support.microsoft.com/kb/310561

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