Both the 40GB main drive and my 120GB backup drive are now all spotlessly clean and shiny on the inside, and things are once again working the way they should.
Somewhat later than I’d like, then, I’m getting to work.
And I should be ashamed of myself. While I was sitting here waiting for opportunities to click the "Continue" button, I had a nice big glass of iced green tea (tasty and at least moderately healthy), and <sigh> the Potato Chip Breakfast, which consists of a medium-sized bowl of potato chips and a hunk of blue cheese, cut into slices, to put on the chips. Bad. Bad, bad. BAD.