Dakini why do you want to store all of your books on your reader. I keep under 100 on mine. It seems slow to page through 100 books looking for one. Would it not be easier to store them on a computer or flash drive and add a few in your current reading queue?
When using the Android tablets or phones you can keep them all in a directory on a card and only import the ones to be on your shelves, but with a dedicated ereader the unit must process all that are there. Seems like asking alot of a reader, especially since you can only read a few at a time if that? Just curious.