But.... collections are stored strictly in the database.... and that is strictly on the internal storage of the device.
Remember IF you use the collection management within calibre (ie setting a value in the device driver's field for bookshelves) then every time you reattach the device to the PC and to calibre, the shelves will be reset to whatever value(s) those columns listed contain.
Once you have started to use calibre to manage shelves, let calibre manage them; don't try to do management from the device itself.
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