Apple originally introduced FileVault to bring full-disk encryption (FDE) protection to macOS. FDE ensures that your entire startup volume is locked away when macOS is shut down (not just sleeping) by setting an encryption key for the volume. FileVault locks that key away, pairing it with an account on your Mac that’s authorized to log in after a full shutdown. Without that key, there’s no effective way to bring that computer to life. Starting with Intel Mac models with
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