If you bought a Steam Deck with a 256GB or 512GB SSD inside, you’re probably not aware of an issue that affects people with the cheaper 64GB model. You see, games on SteamOS download pre-compiled shader libraries as well as additional data to help with Steam Deck compatibility, and this data can take up quite a bit of space on your internal

Source: Hot Hardware – Steam Deck’s Shader Storage Limitation Is No Match For This 61TB SSD Mod