I recently learned that my hard drive was encrypted with Bitlocker, had I not been attempting to get Genode running off a USB stick, I might have gone on for a year or to in blissful ignorance of how remarkable insecure my stuff was as a result of this.

It took about 12 hours to decrypt it, and restore sanity.

Availability is part of security, if it's encrypted, and you don't (or can't) boot just the way Microsoft wants, all your data is gone.