Voila, c'est fait :
-bash-3.2# diskutil erasevolume jhfs+ "Macintosh SSD" disk0s2
Started erase on disk0s2 Macintosh SSD
Unmounting disk
Erasing
Initialized /dev/rdisk0s2 as a 186 GB case-insensitive HFS Plus volume with a 16384k journal
Mounting disk
Finished erase on disk0s2 Macintosh SSD
Je...