So, I have a rMBP with USB 3. I have a Nikon SLR which uses Compact Flash cards. I bought the Kingston USB 3 Media Card Reader. i plugged the CF card into the reader and it saw it, super. I then tried to access/view/transfer the files to the rMBP (jpg and RAW files). The mac informed me that the files could not be read and then force ejected the drive. It does this every time I connect the reader and a CF card. I've tried reformatting the card, different ports, restarting the computer, updates, the whole lot. I get the same problem every time. Has anyone else had a similar problem?