Wipe the slate clean.
Knowing how to format a microSD card on the Steam Deck is as essential as the card itself.
Its easily done, though, as the shortness of this guide attests.
Or format it again, if (touch wood) theres ever a technical problem with it.
Or you just want to uninstall a bunch of games at once, in a slightly brutish fashion.
Step 2:Turn on your Deck and press the Steam button to kick off the main SteamOS menu.

Scroll down to and select “prefs”.
Step 4:Once youre on the latest software version, its time to format.
For a more reliable method, leave the System menu and scroll down to the Storage section.

Then, highlight your microSD card and press the Y button.
Step 5:Hit “Confirm” when prompted.
Therell be one more window after this; just press Confirm again.

A little star should appear next to it, confirming the switch.
From there, just hit “Move”, then “Close” once the transfer is complete.
