Last login: Fri Nov 10 19:33:06 on ttys000
iMac-de-Adrien:~ adrien$ diskutil partitionDisk disk1 gpt jhfs+ HDD 100%
Started partitioning on disk1
Unmounting disk
Error: -69877: Couldn't open device
(Is a disk in use by a storage system such as AppleRAID, CoreStorage, or APFS?)
iMac-de-Adrien:~...