I do remove the 2nd SSD from its plug when I go back to win7 just to be perfectly sure. the last thing I'd want is to shit up my win7 install. I could care less about the win10 bootloader when I can't get to desktop. as for 1803, I dunno, I get the feeling that I'd suffer the same fate. my ryzen is rather old. my bets are on backwards compatibility. as for security updates, nah that's far from priority. I'm not normie enough to buy in to the whole Y O U R C O M P U T E R M I G H T B E A T R I S K