Books using Kobo's desktop will only go to the sd card when the main memory is full.
But calibrr will allow you to use the sd card 100 percent of the time. The advantage is that the memory card will remain intact if you do a factory reset which erases the main memory of the unit as it restores the unit. You will have to process the books again to have the reader see them but if your on vacation your books will not be lost.
regards
JAck
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