Reinstate hard drive partition

[enTerbury]

what i did:

1) bought a new 2tb internal hardrive.

2) plugged it into my existing system.

3) formatted it for use with win10, but didnt use it.

4) got it out and into a new tower where i wanted to install win10 on it with a boot stick.

5) it showed me 2 drives, one of which, i thought, showed what i formatted on windows. so i deleted and formatted it. now i somehow ended up with: 

(see image)

6) obviously i can't install windows on the 2gb drive, even if i format it. how do i get the 2tb "back"? do i need to format it again on my first tower? note that i dont want to recover data, just the drive space.

 

thanks a lot in advance.