Thanks, PeterT. I don't know if it's relevant but I closed Calibre, then deleted from the card the files driveinfo.calibre and metadata.calibre, re-opened Calibre and reconnected the phone. After I'd done that, the initial scan started with the Book folder, and only that folder. The scan still took 1/2 hour but then I've >5k books, so that's not too bad. Problem has gone away -- though whether I actually "solved" it or not, I don't know!
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