I had problems concerning my personal android cellular phone for the for almost a month already. The secure digital card that I had was corrupted and I need to unmounted it because I can no longer save some files in it like pictures and those that I downloaded online. I emptied my card slot on the cellular phone and let it this way. But as days pass, it gets an error warning. Last week I decided to bought a new micro secure digital card. It is a sixteen giga byte card that hold on to my saved files from camera pictures and other downloaded stuff. Now my cellular phone functions well and I got no more problems on its internal memory.