I have recently purchased an Android tablet (Simban Presto). I have also chosen to add two Lexar 64gb micro SD cards so that I could load them up with shows and movies I downloaded. However, every time I try to reinsert the micro SD card in the tablet slot, it tells me it's corrupted and needs to be formatted. I am trying to transfer the files via USB and leaving the SD Card inserted, but its taking forever and then the system tells me I can't copy anything.... help!! A very frustrated new tablet owner.