C'est fait :)
MBP-de-Julia:~ juliatrividic$ diskutil eraseDisk jhfs+ CLE gpt disk2 ; diskutil list disk2
Started erase on disk2
Unmounting disk
Creating the partition map
Waiting for partitions to activate
Formatting disk2s2 as Mac OS Extended (Journaled) with name CLE
Initialized /dev/rdisk2s2...