I was using my SD card on my phone. One fine day it showed a message that it was corrupted. I put the card in an adapter and plugged it into my iMac.
I was able to read and copied all I need. I decided to format it anyway and used disk utility to do so.
I tried deleting each folder. But when I ejected and put it back in, the files are still there. I can't format it via my phone either and I am too scared to use the terminal for erasing. Can anyone help me?