I have this strange problem while using the sandisk ultra class 10 16 gb memory card on my 520. Whenever I have chosen to save apps on SD card, the store says there is problem with memory card and my phone hangs. And when I boot the phone it says it needs to scan my memory card and then after sometime it says your memory card has irreparable error. please use another memory card. But when I use the memory card with the adapter provided on PC it works fine. What might be the problem on phone? Does 520 not support class 10 memory card? If not which would be the best 16 GB memory card for 520? Thank you in advance