Thread: Aura HD Kobo Aura HD
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Old 05-02-2013, 11:32 AM   #635
Uschiekid
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Posts: 724
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Join Date: Oct 2012
Device: Kobo Aura One, Kobo Glo
Quote:
Originally Posted by davidfor View Post
As you mention swapping SD cards, I think I'll add an explanation of what happens when you put an SD card in a Kobo ereader.

When you insert an SD card, the device processes all the books on it and adds them to the internal database. This is used for the library. This is the same as when a book is sideloaded to the main memory.

When the card is ejected, the device does nothing except it will no longer list the books that are on the card in the library.

If you put the card back in, the card is checked for changes. Books that have been deleted are removed from the database. New books are processed and added to the database. Books that have been changed, are removed from the database and then added as new books. As far as I can tell, the file size is what is used to determine if a book has been changed.

What the above means is that if you eject and replace an SD card, it is reasonable fast. But, if you eject it and put a different one in, all books on the first card are removed from the database and all books from the new card are added. That can take some time if the card has a lot of books. If the cards share contents, such as you copied the books from one card to another and added more books, it should treat it as the same card and only process the differences. But, I haven't tried this.

As I mentioned changed books on the SD card, changes are handled differently for the main memory. If the book changes, it is completely removed from the device. The book is deleted and all entries in the database removed. Again, the change seems to be based on file size. If you use calibre to send a changed book to the device, calibre will update the file size in the database to prevent the book from being removed.

The above is based on experimentation with my Touch and Glo over all the different firmware versions. The above is what the current state seems to be. As the firmware is common between the devices, I expect the Aura HD to work in the same way.

So it might be a wise move for those with lots of manga to upgrade their internal SD card with a 32GB and then use a 32GB in the external slot to get the most space?
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