Install 4TB hard drive on old motherboard

[roberco30]

I have an MA785GM-US2H motherboard, which doesn't support UEFI. I partitioned a new 4TB hard drive using gparted on Ubuntu as follows.
1st primary partition size 0.5TB format type NTFS, which will be used with Windows 7
2nd primary partition size 1.6TB format type ext4, which will be used with Linux
3rd logical partition size 1.5TB format type ext4, which will be used for data storage
I then installed Windows 7 on the first partition and Linux on the second partition. But the 3rd partition is unusable by both Windows and Linux. Is there any way to make the third partition usable?
I even tried to make the whole hard drive GPT, but then I could not install Windows 7. Windows 7 kept giving me an error that says that windows can't be install on a partition type of GPT.
I'm stuck.

Thanks!

 

[greatmaharg]

Stupid question- have you actually formatted the 3rd partition? I think it needs to be NTFS (maybe?) to be seen by Windows.