Console or handheld support
Xbox lists the card as compatible with Xbox Series X and Series S. Xbox Support says Optimized for Xbox Series X|S games must be installed on the internal SSD or an expansion card to play.
Seagate Storage Expansion Card for Xbox Series X|S, 1TB
The original Xbox Series X|S expansion card. It plugs into the slot on the back of the console and runs Series X|S games like the internal SSD.
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1TB Storage Expansion Card, model STJR1000400
1TB Storage Expansion Card, model STJR1000400
What works. What doesn't.
Speed
StorageReview found no real difference between loading games from the card and from the internal drive.
Capacity limits
StorageReview's 1TB card showed up as 920GB of storage on the console.
Installation
Seagate says the card plugs into the console's expansion storage slot.
Read the bigger picture.
Game storageBuying guide
Xbox Series S storage: an expansion card plays new games, a USB drive stores them
A USB drive cannot run Xbox Series X|S games, only store them. An expansion card can. Three drives matched to the games you play.