Just got a new Western digital 6 Tb internal hard drive (WD6002FRYZ) added to my system ASUS ROG Maximux IX motherboard. When I attached it, the computer did not recognize it, nor was it seen in the bios. However, it works perfectly fine in an enclosure connected via USB. I tried different SATA ports with different plugs and different power supply connectors and still the same thing. I had the same problem with another WD black 6 TB internal hard drive which I returned because I thought it was faulty. Not only did it not show up, another hard drive that was working perfectly well before (4 Tb Seagate) that I had already connected disappeared as well. That drive also works only via USB. I have also tried the molex to SATA power connector but still nothing. I'm wondering if it's a motherboard issue or something really bizarre. Any ideas would be extremely helpful as this is majorly frustrating.