For an SD card, “store something you care about” will very often mean photos or video. You have no choice but to trust the SD card for the time it takes you to get to your computer where you can dump the contents into something more reliable.
High end cameras usually have dual card slots to help deal with this, but even that won’t help when the failure mode is trying to write past the cards’ actual physical capacity, because the counterfeit advertise more storage than what’s actually there.
