That is good news. I was really wondering why checkdisk did not run in the first instance.
I think you are in the habit of connecting the external drive after starting the program. Many programs will not detect the drive if you connect it after starting the program. Always plugin your drive before starting any program - even checkdisk.
Now do not interrupt check disk. Let it run.
Post the screenshot after it completes it.
After taking the screenshot, close the command Window and then Reboot your PC.