Rather than having to fumble for media or hope that no super-secret restore partitions have been deleted in the quest for more disk space, Windows 10 will now download and install a fresh copy of the currently installed version of the OS.
So, how does that work then? If I've deleted the super secret restore partition where does the code to do the download come from? Won't this require firmware support?? (As I believe Apple does*)
* aside: Oh what fun if you've bought a second hand mac and you don't have the version of the OS it ships with tied to your iCloud account.