Thank you Titanic. I checked the registry subkey as you recommended. It is correct.
In Windows Explorer when I get to the list of files-folders in the F: drive right clicking on any folder does not produce a "New" in the new drop down window. But if I right click on an empty field, the drop down window gives "New" and it seems that I can produce new folders in F: but not folders of existing folders (subfolders). Is there a limitation of only one layer of folders in F: (Goflex aux. drive)?