I have two Western Digital "My Book" desktop drives that I have been using to back up data on my Windows 10 computer (I've been using them since Windows 7). All of a sudden, when I plug them in, they fail to appear in my MS Explorer. When I go to GoodSync (my backup program) the drives appear, so I know they are properly connected and Windows recognizes them. How can I get Explorer to recognize them so I can work with the files? I'm not aware of any changes that were made to my system since the last time I used them.