Boot Windows 10 or 11 from a MicroSD card Before installing Windows on the Steam Deck, one good recommendation is to boot from a micro SD card or USB drive first.

If you want to install & run Windows 11 from microSD card on Steam Deck, then see this post for step-by-step instructions.

What Is A Bootable SD Card? Bootable SD cards are essentially SD cards that have been configured with an image of an operating system. Once a bootable SD is connected to the computer, the system ...

The Steam Deck also supports booting from a microSD card, which means that you could install an operating system to removable storage.