Hello and thank you for your answer,
"I assume that ESXi is installed on an internal SD, or BOSS card!?"
--> Yes i think because here are my disks : http://prntscr.com/mqp8tg (ESXi is install on the first disk ? --> http://prntscr.com/mqq488 ).
Thank you for your link, I consult it as soon as I have the confirmation that the ESXi is not installed on the disk 'Local DELL disk'.