One of the key differences between the Xbox Series X and Xbox Series S other than graphical capability is the size of their solid-state drives. The Series S comes with roughly half the storage space of the Series X out of the box: 512 GB compared to 1 TB respectively. And the Series S does not have a disc drive to play physical versions of games. Of course, you have the option for the SSD expansion card, but that’s sold separately. When thinking about how big current-gen games are, and how they might just get bigger in next-gen, you wonder if 512 GB is even sufficient.