Plug the drive in, and when it shows that the drive is there open the command prompt and type "diskpart". Then type "list disk", and a list of your disks will appear. Find the usb drive and type "select disk #" where # is replaced by the number of the disk. (eg. if it is disk 2 type "select disk 2"). Once it has selected that disk type "list part", then "list vol" and post screenshots of the last two commands and their results here.
Microsoft Surface Book 2 15in review