Been using SD Card Repair Fixer for a couple months now. It’s basically a free app that can quickly and effectively check and verify your Android device’s SD card without needing to root your phone. Pretty solid if you’re into that kind of thing.
Here’s what you do: you can scan your SD card to see if it’s working properly. There’s also an option to repair any issues it finds – took me a while to figure that part out but it’s useful. And you can even test your USB OTG connection to see if it’s working.
Look, if you’re having issues with your SD card or just want to make sure it’s in good shape, you’ll probably like this app. It’s not perfect – the UI could be a bit more user-friendly – but overall it does the job. Worth checking out.