Thanks, Joe.
I tried the method as provided in your link. It all looked like it was going to work. The SSD "reset" went as expected. However, Terminal stated that the HDD could not be "unmounted." So I did a "force unmountDisk" command in Terminal, and got the message that the unmounting was successful.
BUT . . . when I went back to re-do the drives, I again received the could not unmount the HDD message even though Terminal's log stated that the unmount had been successful.
So . . . I will try Artie's link and see how that goes. Fingers and toes are crossed.
