-bash-3.2# diskutil eraseVolume jhfs+ "Machintosh HD" disk0s2
Started erase on disk0s2
Unmounting disk
Erasing
Initialized /dev/rdisk0s2 as a 223 GB case-insensitive HFS Plus volume with a 24576k journal
Mounting disk
Finished erase on disk0s2 Machintosh HD
-bash-3.2#