voila,
-bash-3.2# diskutil eraseDisk jhfs+ CLE gpt disk22
Started erase on disk22
Unmounting disk
Creating the partition map
Waiting for partitions to activate
Formatting disk22s2 as Mac OS Extended (Journaled) with name CLE
Initialized /dev/rdisk22s2 as a 7 GB case-insensitive HFS Plus volume...