I just built my new PC and everything is running great except for my HDD isn't showing up in windows. My main drive is a Samsung Evo 840 and it works like a dream. I also installed a Seagate 3TB HDD but in windows (8.1) I can't find it when I look under "This PC." However when I'm in BIOS it says the drive is there as well as when I go to device manager in windows, and in device manager I checked for latest drivers. This is my first time building so I'm sure its some stupid mistake on my part, any help is much appreciated.