I have an older device on which I keep needing to reinstall channels. If I upgrade, I don't want that to happen again. But from what I can tell, Roku's web pages do not give this information for the devices I've looked at (or else either I'm an idiot or they've hidden it quite well). Any sense of where they might have this info (I realize some have a slot for a card, but not all, and I may not want to spend yet more money, so I'd like to know how much on-board channel space each one has). Thank you.