See, while it’s fairly easy to replace the Steam Deck’s SSD, it’s not quite as easy to buy the right parts. The Steam Deck uses the smallest kind of modular SSD — the M.2 2230, which measures just 30mm long — and it’s only designed to fit a single-sided one, which has flash memory chips on one side.
More importantly, M.2 2230 drives are generally considered OEM products that aren’t sold to customers…