UPDATE: The solution described below still works with the just released Mac OS X 10.7.1. (Aug, 16 2011)
So, I have this urge for security when it comes to my personal data. I really love how FileVault2 in OS X 10.7 Lion doesn’t only encrypt the Home directory of a user, but the whole disk instead.
What I learned today: this doesn’t work for power users and if power uses get it to work, there’s a creepy and scary and dangerous monster lurking in the dark. A bug.
This is the story of how I managed to encrypt my external (or rather: second) HDD with the home directory on it, how I rebooted my machine and couldn’t mount that device during boot/login anymore, how I logged in as a second user and couldn’t mount that device anymore (even with superuser privileges), how I almost started crying, how I thanked Steve for TimeMachine and how I found a bug that luckily others found before me and developed workarounds for it.
But let’s do this step by step…