I've got an external drive with a lot of separate folders. To clean up the file structure, I want to create a few "higher" level folders and move the separate folders into them. On the internal hard drive, when I drag one folder into another, it "moves" in. Instantaneously. On the external, when I drag one folder into another, it "copies." It takes time to create a new folder in the target. And I end up with two copies of the moved folder. I'm guessing that there is a setting to change this? Thanks.