You can choose which user accounts have the ability to unlock your disk. (Without FileVault enabled, anyone with physical access to your Mac could remove its hard drive and view your files, because they’re stored in an unencrypted form.) Someone who gains access to your Mac, removes your hard drive, and attempts to view your files won’t be able to see anything without your encryption key. When you enable FileVault, your files are stored on your hard drive in an encrypted, seemingly scrambled format. The FileVault feature allows you to encrypt your Mac’s entire hard disk.
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