I had the same problem with WD Caviar Green 3TB, i could only get 746gb to work. I have a 64 bit win7 INTEL comp. The thing i had to do to get everything to work was to update my raid/sata drivers at
http://www.intel.com/p/en_US/support/highlights/chpsts/imsm
then i chose automatially detect and update drivers and software ,then search raid/sata update and restart computer and thats it, now i have 2 partitions a 746gb and 1.99TB Disk, i hope this was helpfull, goodluck to all
