I have a Seagate 4TB drive that I want to use strictly for video archive but can't get it formatted. I have read a few threads/sites and it points go gdisk but can only get 1.7TB. Is there an easy way to see all 4TB? I'm not the best at terminal but can copy/paste just fine.

I am using Ultimate Edition 3.4 in 64-bit. I do have access at work to a Win-7 & Win-8 machine if that simplifies things but would be connected via Thermaltake USB dock.