Unable to Delete Partition on ESXi 5

I encountered an error when I attempted to delete a datastore via the client so I switched over to the command line to try there.  I followed the steps prescribed here:

Using the partedUtil command line utility on ESX and ESXi

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1036609

But this is the result:

The red highlight is my emphasis... 

The datastore is empty and unused, I created it and then attemted to delete it minutes later.

These are the specs from partedUtil getptbl:

msdos

243068 255 63 3904897024

1 2048 3904887419 251 0