You might try this tutorial: Regain a lost drive using Test Disk - An Illustrated Guide
I have never used the tutorial or the Testdisk utility. In searching for other solutions, Testdisk often comes up and is well regarded. I spoke with the author of the tutorial about a week ago, and he retested the stable version on both a 32 bit and 64 bit machine, so you can ignore the
64 bit WOW strikeout
on the Testdisk page.
Just make sure you download the stable 6.13 version
the beta 6.14 version
When you get to
12.Ninth window: Confirm write partition table by pressing Y
Make sure that the information presented is what you expect it to be, the tutorial images show jumanji's drive so the numbers/size will be different.
Looking back at the Disk Mgmnt screenshot, I would expect you to see 1862.89Gb or 1.8Tb. As I mentioned I haven't run this tool, I'm not sure how the utility will present the drive, it might say 2Tb. If you want to post a screenshot when you get to that point, please do.