While you might be able to switch out the Steam Deck’s drive in theory, Valve says you shouldn’t.
The Steam Deck offers the possibility of replacing its storage, at least in theory – although Valve warns against making such a move – and even the base model with an eMMC drive may allow for an M.2 SSD upgrade. That said, there are a lot of other caveats around this even aside from Valve’s aforementioned advice. This all stems from a Reddit post from someone who directly emailed Gabe Newell at Valve asking if the portable PC would have a user-replaceable SSD, and Valve’s President responded that the Steam Deck features a 2230 M.2 slot. Obviously we need to be cautious around info floating down from Reddit, but it does appear that the official spec of the Steam Deck has been updated following this info spilling out. That spec now notes: “All models use socketed 2230 m.2 modules (not intended for end-user replacement).
