Are you trying to get rid of all those partitions on your usb stick? Have you backed/copied all the data on the usb stick?

By opening a elevated CMD prompt allows us to see the partition structure on the usb stick.

Ok so type cmd in the windows search box - run as admin (should now show as C:\Windows\system32>)
Then follow Andre's post 5 to show your disk 2

Doing this will not alter/fix your current disk... that will come later