I think I have just discovered a work-around. Kindle has a utility to move books from the device memory to the card. If I remove the card and use Calibre to add books to the device, I think I can then use the utility to move them them to the card. A minor inconvenience, but it will do them in bulk and I'm not planning on putting that many on the kindle. As I mentioned earlier, I'm just using it to maintain some reference books since the Sony is my primary reader.
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