I backed up some files to my 64gb usb drive and then I made the same drive an installation media for windows 10, not knowing it would wipe out my files. After installing windows I looked at the properties of the usb and it said it only had 31gb of maximum capacity, so technically it halved in storage. I don't really care for retrieving the files because I already format the drive. I just want it to be 64gb again. Any ideas?