Originally Posted by taustin
Books you buy from B&N and download through the device are stored on a hidden partition that isn't accessible to Calibre. It is unfortunate, and there's no way to change it (though you can "root" the device and run a standard version of Android, and have complete control, but I don't think that will let you buy from B&N the same way as the stock device). You could turn off the WiFi on the nook, and treat it just like your Sony, which is to say, buy through B&N's web site, download it, import it to Calibre, and transfer it to the nook, but again, that loses the convenience of shopping directly from the device.
That alone is the number one reason to root the simple touches. I will not have any device that I can't access the drives on.