Bought a WD My Passport 1TB earlier today. It was the one formatted for Windows, so went home on my desktop and reformatted to exFAT right away. Then loaded files onto it. Then disconnected safely and plugged into my rMBP. Doesn't show up. It does however show up in disc utility. I tried with mac plugged in, all different usb slots, and it was the same cable I used ten minutes prior. Anyone have anything for me? Do I need to download something? Any help is appreciated.