Quote:
Originally Posted by tamhas
Periodically, I will take a set of books which have automatically downloaded to my Kindle and add them to Calibre. Sometimes, when I go back the next time, these, or some of these, books are not shown in the device viewer as being in the library. If I match them to the library, they are sure enough there and it seems that after the metadata in device update, that this then sticks permanently. I brought this up previously and the suggestion was made that it related to my keeping my Calibre database on Dropbox, i.e., actually pointing it to a Dropbox folder, not copying it there after each use. This doesn't make a lot of sense to me since it seems like it must do some kind of match when the device is connected to know what is new. I used to keep Calibre open for long periods of time, but don't do that any more, so right after I have done an update like this I have gotten out of Calibre so it should have a clean relationship to the database. Clarification, perhaps?
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Getting back to the original question: this can happen if there are two calibre libraries containing the "same" book. The problem is that the books are not the same. Calibre assigns a unique identifier to a book in the library. When you do a "book match", that identifier is stored on the device. If later you connect the device to a different library then the identifier can be changed, meaning that the match to the first library is lost.
Bottom line, it isn't a good idea to have multiple libraries that contain the same books.