SD card Damaged, but IS AVAILABLE via pc

[magicdan7]

Odd issue....Running Smoked Glass and everythings been smooth as hell. then out of no where my SD card isn't available. YES, I have rebooted, popped out and in, same with battery. All no help. I get the "SD card is Damaged" and obviously not usable.

HOWEVER!!!
When tethered to pc and mounted...all the SD cards data is there on my pc. Unmount and the card is suddenly "damaged" again....so WTF?????

Yes things are backed up, but I want to figure this out to insure it doesn't happen again and to aid others.

Any clues?
Thanks........

Dan