I have attached my Android SmartPad to my Pc Via USb cable, I went through Storage, and have Mass Storage Device (lets you transfer any files on Windows or Mac computers). I have a 125gb Micro SD Card in the tablet and want to transfer some more files from my PC to the memory card to watch on my tablet. When I open windows explorer on the pc it shows all the internal and external hard-drives, and my phone and Memory stick- the only thing that is not showing is my Tablet (or the memory card that is mounted inside the tablet).