Originally Posted by rem736
with the aura hd, what's the advantage of swapping out the internal memory card when you can just insert another card into the external slot made just for it? does it access the books faster, or use less power accessing the internal card than the external?
It also is a way to have an image of the entire firmware and data needed to run the device. With that you can always recover, even if the device's operating firmware becomes totally corrupted.