I didn't know anything about this Win10 problem, what I do know for sure is that this happened during the month of May, the month in which the update you mention was released, but it's very strange, since the disk hadn't done anything strange until it stopped being accessible.
I'm using Remo recover to see what I can recover, so far 4 days and 8% scanned, let's hope there are no power cuts or any OS crashes.
Thanks.