Originally Posted by PeterT
Are SD cards in use?
Not here, no. On my old touch I fancied the additional card drew extra power, knocking around a week off of a month's worth of use without. And in practice it wasn't required anyway since I keep my library in calibre. I only side-load around 5 books at a time which is still a lot of reading material on tap but gives faster start-up times and quicker access speeds.