Xbox Series X 'mystery slot' expected to fit CFExpress cards - Hardware - News - HEXUS.net
I'm pretty sure that the mystery slot on the back of the Xbox Series X is a CFexpress memory card slot. If an ethernet port is about 11.5mm wide then using the
Storage Expansion Card For Xbox Series X|s Cfexpress To Ssd M.2 Nvme Adapter Sn530 1tb Expansion Ssd For Xbox - Harddisk & Boxs - AliExpress
Enthusiast connects NVMe drive to Xbox Series via CFexpress adapter - Aroged