Quote:
Originally Posted by Alpha o
I normally download to the computer and stick the files on the SD card. Put the card into Kobo Glo, and it reimported quite a few of them if the date and author were different. (some books show "unknown")
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Sorry, you are only half right. The Kobo devices work on the full file path to identify books. You can put the identical book with identical metadata in two different places, and as far as the Kobo device is concerned you have two different books. It will list them as two books in the library.
If you replace a copy of a book, using the same file name and path, then the firmware will check if it has changed. If it has changed, then the book is removed from the database and then added as a new book. If it has not changed, nothing is done. The only thing that is used to determine "changed" is the file size. This is recorded in the database when the book is first seen. If the next time the device checks the book and the file size has changed, the book is considered to be a new book. If you are using calibre to put the books onto the SD card, and then replace them later, it is highly likely they changed. Calibre updates the metadata during a save-to-disk or send-to-device, so, if any metadata changed, the file size is probably going to change.
Note: The KoboTouch driver has a workaround for this and will update the file size in the database when sending new copy of the book to the device.