I have a Dynex internal card reader. When I insert an sd card, I cannot view the contents. When I enter Computer Management, the drive shows up, but shows up as unallocated space. I can't seem to do anything to any of my sd cards. There is currently photos on one of the cards. The rest can be freely formatted. But when i use my usb card reader, I don't have any problems at all viewing the contents and formatting. I am running Windows 8.1 Pro. Any ideas?