i also have the 4tb WD drive and it has limitations. If you have an asus motherboard, you need to find disk unlocker by a google search. the program doesnt really work for me but windows disk management allows me to partition it as gpt and recieve 3725 TB all on a single partition. However, i also installed this 4tB drive as a secondary drive (the boot drive is sata II windows 7 x64 running in ahci, no uefi) and while bios will recognize its there and windows will let me partition/assign drive letter…i cant access it. the only way i can access the drive is to put it in a sata/usb dock and run esata to pc. this may be a deal breaker but I’m going to give it every shot i can to make it work out.
edit: it may have something to do with the primary drive being mbr.