Cool. I was wondering that about whether the SD cards would be swappable while switched on, or whether you'd have to power it down first. Sleep mode doesn't sound too bad. (as that's kinda the same for regular cartridges) Wish you could hot-swap though while it was switched on. But at least sleep mode is alot easier than how it was on the WiiU where you literally had to power down the whole console and wait for it to boot back up again. (that was for USB drives though, but still!) -USB should have technically been even easier to hot swap! (that's how it is on most other gadgets)