I didn't see this thread before starting another one, but my PRS-700 won't dismount at all after using the latest version of Calibre, and in fact, crashes the Finder in OS 10.4.11. I don't get the "in use" error, the Finder just says it can't find the volume and then stops working. I'll try the Terminal command and see what I get next time it happens. Don't want to do that right now, as I just finished power cycling my Mac (again).
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