This is a minor update to my previous post.
At about noon today, I left the house; I turned the drive off (with the dashboard) before I left. By the way, maybe I should mention here that I have neither SmartWare nor TimeMachine installed.
It’s now about 2:30. As soon as I came home I turned the drive back on. All “obvious” systems are “go”: I can access both my data and the dashboard.
I’m going to have to wait awhile to see whether the drive goes to sleep. I checked in the dashboard, and “sleep mode” (or whatever it’s called) is checked.
I’ll keep you posted.