Back in January Microsoft encrypted all my hard drives without saying anything. I was playing around with a dual boot yesterday and somehow aggravated Secureboot. So my C: panicked and required a 40 character key to unlock.
Your key is backed up to the Microsoft account associated with your install. Which is considerate to the hackers. (and saved me from a re-install) But if you’ve got an unactivated copy, local account, or don’t know your M$ account credentials, your boned.
Control Panel > System Security > Bitlocker Encryption.
BTW, I was aware that M$ was doing this and even made fun of the effected users. Karma.
I’ve occasionally seen it activate itself on computers with only a local account, though I’ve so far only seen it when upgrading in place to 11 with secure boot enabled in the BIOS, and not every time. Fortunately the one time it locked me out was on a freshly cloned drive, so it only cost me redoing the work.
Also, the number of people who I’ve seen lose all their data because they don’t even know they created an MS account during OOBE, and later had a boot or BIOS hiccup, is too bamn high!