Formatted on my D750, then shooting, my PC (Windows 7 premium) will not open the card. It gives a message saying the card must be formatted. I did format it in the PC, took photos, and it did then open. I would rather format it in the camera, for that probably has some benefits.I would think the 750 would be compatible with this PC. The card is SanDisk Extreme Pro 64GB - 95mb/s Any Ideas?