I bought and installed a new 4tb WD4001FAEX SATA drive for secondary storage but the drive only lets me format approx half the drive leaving the other half unallocated. It makes no sense and is both a major waste and a bummer. It actually shows two separate volumes on the drive! I use a SSD for my C: drive which operates perfectly. For what its worth, I have a LGA 1150 Gigabyte Z87X-UD5H motherboard that is UEFI. Does this have something to do with MBR and GBT? I could really use some advice.