Et voici !
-bash-3.2# diskutil resizeVolume disk16s2 995g jhfs+ BOOT 0b
Resizing to 995000000000 bytes and adding 1 partition
Started partitioning on disk16s2 Sans titre
Verifying the disk
Verifying file system
Volume was successfully unmounted
Performing fsck_hfs -fn -x /dev/rdisk16s2
Checking...