Someone gave me a thumb drive with stuff on it. I decided I wanted to use the drive for something else. It showed a bunch of unallocated space in Disk Management, space that couldn’t be unfrozen from there.

I found these steps, which took care of the problem.

http://geekswithblogs.net/ilich/archive/…

Probably there’s a simpler gui way to go at this but I didn’t want to search too far, I just wanted an answer quickly and Google provided.