Thanks John. I checked the tab that said, "show hidden files and folders." It had been unchecked.
The next bit -- unchecking, "Hide protected operating system files." told me the computer would not work if I went ahead and did that.
Is it a lie?
Anyway I think the first bit might have worked. I watched the drive disappear when I removed the stick. (I'm always careful to wait for the "Safe to remove device" message before I do that.)
Now I think I can remove the extra drive icons -- I did that once before. Then I'll see if they return.
Thank you again.
Regards, Joy