long time lurker first post lol this happened out of nowhere on my Steam Deck LCD:

microSD card can't be read
The card may need to be formatted for this system,
or it may be damaged. Formatting erases all data.
Card: 512 GB - status: not mounted
the card is a cheap 1 TB card. i tried rebooting and reseating it. nothing. i cant even tell if teh card is dead or just has a broken file system 👍 what should i try first?
im comfortable following steps in a terminal if someone explains them... im just not suree where to start, and i dont want to make things worse.
id also love to know how to avoid this in the future. is it the card, teh device, or just bad luck? pls help 🙏
printer saw i was in a hurry and chose violence

