Hard Drive Space loss after expanding partition

Okay I have a small problem.

I have a 120 gig solid state hard drive, that I have my OS installed on (Windows 10)

I was going to install windows 7 on a second partition on that hard drive, so I shrank the current partition and it gave me unallocated space.

I had a few people tell me it wasn't possible to install windows 7 on the same hard drive as windows 10... for some reason or another.

So I decided to expand the partition back to its original size (the whole hard drive).

Before I shrunk the partition.. I had 60 gigs left, I shrunk it by 20 to install windows 7 on.

Well after some people told me it wouldn't work. I decide to re-expand the partition to take back up the whole drive.

Problem is, when I did that.. I loss that 20 gigs, it says that 20 gigs is 'used' space now. I tried scanning the hard drive for errors and defragging (won't let me defrag that drive.. I assume cause its either a solid state drive or the windows drive)

I don't know how to get that lost 20 gigs back.

Any suggestions?

Anyone?

Nevermind. Fixed it.