The only circumstance under which you might lose your books is if you just yank the card out without powering off the unit or doing the unmount thing. And like yanking it unceremoniously out of your computer, it is hit or miss whether you mess something up.
In the "Settings/Device Info" menu, there is an SD Card line that gives a selection for "Unmount for Safe Removal" which allows you to remove the SD card in the same manner as removing it from your computer.
As far as I know, if you power the unit off (not just standby), it serves the same purpose.
Edit: Naturally, if you have removed the card from the reader, the books on it are no longer available until you plug it back in.
Last edited by eGeezer; 08-03-2011 at 01:22 PM.
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