I recently bought a 64gbs sandisk sd card for my Samsung Galaxy 5. I put it in, formated it. Backed up my files first. I moved a file or picture to the SD card. It was there, great. Then, I deleted the file from my device because I needed the room. Went back in the sd card it was deleted too. Keeps doing it, I rebooted the phone. Took out the sd card, reinsurted it. Still the same.