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Want to add another recommendation of this method. Worked for me as well. Quick note on top of the basic steps outlined above: even if the Deck says formatting error again after following these steps, just pop the sd card out and then back in again and it should show up in your storage. Worked for me! Hope others find your incredibly helpful reply to be useful, too. Thanks so much, friend!
after formatting: eject it, put it back in, check if it's listed (reboot with the sd card inserted to make sure it gets listed in the gaming mode interface too) and then try installing a game to it... should work fine
a few observations from other threads:
I'd lean toward a 2TB microSD card being a fake as I haven't seen any actual vendors producing a commercial 2TB microSD card yet.
boot into desktop mode, or connect it to a Windows PC and run h2testw on it with a full test. I suspect it will likely fail.
edit: Also, know that those fake cards can work, and might even report their advertized capacity. However they tend to either fill up without reaching full capacity, or there is a program on the card that deletes the actual data (while leaving the files) so you don't know your data is gone until you try to read it.
Get minitool partition wizard
Right click your sd card when it shows in the program
click format
in type select ext4
let it format
boot steam deck
put in sd card after it's booted up (just incase it doesn't get read during startup I prefer the system to detect it when I've put it in when the deck is already on)
Check in settings > storage that your card shows up
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The previous solutions didn't work for me but this did. Good luck!
Just incase you have some issues with installing / running games from your microSD card, this will not have created the filesystem with casefolding support.
You should be able to re-format it from the command line
Note, if you haven't already you will need to set a sudoers password for the deck user in order to run elevated commands like the above.