There are ways to see the additional space as an MBR partition.
For example, you could use DiscWizard (Acronis) to turn the remaining space into a second "virtual" physical disk.
Shouldn't computer management in admin tools in windows be able to do the same? I mean make two partitions with the first at around 2TB (less than 2TB) and the other with whatever remains. I wouldn't use that big discs for booting, but as a secondary storage disc and without gpt why not. I actually intend to buy one like this (seagate ST3000DM001) as a storage disc for my high bitrate 1080p videos.