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The source (system drive) was set up to use FileVault in the normal way, by going to System Preferences > Security & Privacy > FileVault > Turn On FileVault. This means it can be booted up using the password of any of the OS X accounts alone. This is perfectly acceptable to me since the Mac does not leave my house (in fact it's a requirement, because the Mac may need rebooting at any time by another user when I'm not there). However, the destination (backup drive) is set up a different way: by going to Disk Utility > Erase > Format: Mac OS Extended (Journaled, Encrypted) > Erase, entering a super-strong, random passphrase, and then using SuperDuper to clone using "Erase then Copy" (although subsequent backups can use Smart Update). Following this, I want the backup drive to require the super-strong, random passphrase in order boot up - before it prompts for any OS X account logins - whereas the system drive should only requires the OS X account logins. So, I am actually trying to get the destination and source to prompt differently. And it makes sense that they do prompt differently, because they were set up differently. However I have just made a discovery! I just tried re-building a backup drive from scratch, exactly as described above, and then I tried booting from it. As before, it booted first to an OS X login screen with just 2 users, one called "[Update Needed]" and the other "Guest". However, this time I tried selecting the "[Update Needed]" user, and then entering the super-strong, random passphrase that I'd originally used to encrypt the drive in Disk Utility, and it worked! More specifically, a progress bar appeared for quite a while (presumably that's when it was decrypting the drive), and then a spontaneous reboot, then I selected "[Update Needed]" again and then entering the super-strong, random passphrase a second time, and then a different OS X login screen appeared, this time with all my usual OS X accounts - and I was finally able to login to OS X on the backup drive normally. Based on this experience, it seems to me that the "[Update Needed]" is just OS X's way of saying, I have boot drive encrypted with a password that is not associated with any username, so I'll prompt for it, but I don't know the username so I'll display it as "[Update Needed]". The reason the password is not associated with any username is because it's the one I typed in to Disk Utility to format the partition. I still don't know why (I think) some of my drives had the "Enter a password to unlock the disk ... [Unlock / Cancel]" prompt instead. But now I think that OS X login screen with the "[Update Needed]" user is actually achieving exactly the same thing as the "Enter a password to unlock the disk ... [Unlock / Cancel]" prompt, just in a different way. So now I'm happy that it is basically behaving as I want. Last edited by jmsgwd; 05-07-2015 at 07:53 PM. |
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