Mac Integration Basics v10.7 - Apple

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To ensure security, when you turn on FileVault other security features are also turned
on. For example, a password will be required to log in, after waking from sleep, and
after leaving the screen saver. After the initial startup only users enabled in FileVault
will be able to log in; other users will need an administrator to log in first.
WARNING: Don’t forget your administrator password. If you turn on disk encryption
and then forget your login password, your Apple ID, and your recovery key, you won’t
be able to log in to your account, and your files and settings are lost forever.
Set up FileVault:
1. Choose Apple menu > System Preferences, click Security & Privacy, and then click
FileVault.
2. Click the lock icon to unlock the pane, and then type an administrator name and
password.
3. Click Turn On FileVault.