I installed Windows 10 on my Hard disk instead of my USB

I realized this the next days, just now, my Disk turned from a normal disk to something weird with another icon.

As I had months of work on my disk I'm trying to get those things back using Recoverit, but the problem is my 3.5 Tera Hard Disk magically turned in "ESD-USB (F:)" with only 31.9 GB of storage capacity so I wonder what do I have to do to get my Disk back to normal. I'd need some help, also do you know another program that will help me?
 
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