I have a SanDisk Ultra 64gb micro SD XC memory card and I'm all of the sudden unable to delete anything off it, I can't format it using windows, I can't format using my Galaxy S3. Windows simply says it can't format the card. My S3 unmounts the card and then remounts it and does nothing. I used a program on my computer called SD Formatter and it said the card was write protected. I slid the little switch on the side in both positions and it's the same thing. Is there anything else I can use/do to format this card!?