A 512GB expansion SSD for Xbox Series X/S has popped up online, prior to an official announcement.
Currently, the Seagate 1TB SSD card is the only size available to expand your Xbox Series X/S space.
(The Xbox Series X has 1TB of built-in SSD memory, while the Series S has 512GB.)
The Seagate-made storage expansion card is roughly half the storage size of the existing 1TB card, and has now appeared on both French and US retailers (thanks, Windows Central).