Amazon.com: Western Digital 256GB SSD M.2 2230 30mm PC SN530 NVMe PCIe 3.0 Gen3 x4 SDBPTPZ-256G Solid State Drive for Surface Pro Steam Deck Dell HP Lenovo Ultrabook Tablet : Electronics
It's getting easier to buy bigger SSDs for the Steam Deck and Surface PCs | Ars Technica
How to Install Steam Deck SSD: Can I put a larger hard drive in it? - GameRevolution