I had this trubble, i found that some devices demand the sd to be unmounted through settings to prevent damage to device and or sd. I ignored this, what does it know any ways, its not human so i know best right? No i was wrong i lost every thing from music to photos to bank records, 113MBs worth. You can find recovery apps that work but you have to have them installed and opperating befor the sd goes blank, and if not its snake eyes. The house mugs you. Dry the tears, take new photo memorys, and learn from the mistake as i did. Im sory for your loss.