One thing to test out for when I did something simular to another unit I have is I went the dual micro SD card route to add space because at the time larger SSD's were super expensive. If I used at least two of the three usb ports made onto the computer the SD cards would disappear until a reboot. Or would show up that they needed to be formatted. Only fixed by a reboot. Not sure if the circuit was overloaded or what the deal was. Only tested under windows 7.