"Effacer les 33 derniers secteurs", c'est inclus dans ma dernière modification :
man sgdisk
-Z, --zap-all
Zap (destroy) the GPT and MBR data structures and then exit. This
option works much like -z, but as it wipes the MBR as well as the
GPT, it's more suitable if you want to repartition a disk after
using this option, and completely unsuitable if you've already
repartitioned the disk.