Having copied the files across, I contemplated whether I should turn off the suspect computer. In the end, I figured I might as well do so. I can't leave it turned on forever, and as far as I can tell, I've pulled most of the stuff off of it that would cause me pain if I lost it. So with trepidation and the knowledge that it might be the last time that particular hard drive ever works, I shut it down.
In retrospect, it's sure a good thing that I'd planned today as a work day; otherwise, the first I would have realized there was trouble was tomorrow morning, and as we have numerous things scheduled then, I would have been in big trouble. Not that I enjoyed spending the last nine or so hours rebuilding my work environment, but it's easier to do so when you don't have your managers leaning on you for results immediately.
Now Lisa and I are going grocery shopping and I'm going to try not to think about computers until tomorrow morning.