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I'm using OS X 10 13 High Sierra and have an number of drives that I encrypted using Disk Utility when formatting them (none via TimeMachine). Couple of questions:

I can't determine which are/aren't encrypted - how to determine?

One encrypted drive comes up with a dialog asking to enter the password when my MacBook starts, but its in keychain. So if I enter the pw again it says its already unlocked. The dialog is annoying and only happens with this one drive.

Can I only encrypt a drive on formatting it or can I encrypt it when it already has files on it?

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  • I've worked out 'diskutil list' in terminal shows the attached drives as "Unlocked Encrypted" if they've been encrypted and have mounted.
    – Rusty
    Feb 19 at 7:27

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