If you want to replace SteamOS with Windows, you'll need a separate USB drive bigger than 16GB to install Windows from.If your PC doesn't have a microSD card slot, you can buy a USB-A to microSD card reader.

But, to begin the process of installing Windows 11 on the Steam Deck, there are a few things to keep in mind: Finally, you even can shrink your SteamOS SSD's partition and install Windows alongside SteamOS do dual boot them. In the second method, you can erase the SSD in your Seam Deck and install SteamOS in place of Windows fully. For most people, the first and easiest way to do this is to install it via a microSD card and dual boot it from there without impact to your main SteamOS install. There are also three ways to install Windows on the Steam Deck.