As the title suggests, my sd card has suddenly stopped working. One minute I take it out, and 20 minutes later I replug it into the machine and the card cannot be read. In disk utility, it is recognised, and can see that it's read/write, but the sd card cannot be partitioned or dealt with. From terminal, I use "diskutil list", and it recognises the sd card, but it says nothing under "TYPE NAME". When I try to format/partition the sd card it hangs on "waiting for disks to reappear...". It is not the micro sd reader as I tested it with another computer & another sd card which both worked. I really need help on how I am to fix this micro sd card.