df -H /Volumes/Clone
diskutil eraseVolume jhfs+ "Macintosh HD" disk0s2
-bash-3.2# diskutil eraseVolume jhfs+ "Macintosh HD" disk0s2
Started erase on disk0s2 Macintosh HD
Unmounting disk
Erasing
Initialized /dev/rdisk0s2 as a 466 GB case-insensitive HFS Plus volume with a 40960k journal
Mounting disk
Finished erase on disk0s2 Macintosh HD
-bash-3.2#