When formatting an internal or external volume, you can encrypt and protect it with a password. If you encrypt an internal disk, you must enter a password to access the disk and its information. If you encrypt an external device, you must enter the password when connecting the device to the computer.
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To encrypt and protect the volume with a password using Disk Utility, you must first erase the volume. If the volume contains files that you want to keep, be sure to copy them to another volume.
Important: You can encrypt the data without deleting it by activating FileVault in the “Security and Privacy” preference panel of System Preferences. It is also possible to encrypt a disk and protect it with a password without deleting it, so you have to click the disk in the Finder with the Control key pressed and select “Encrypt [disk name].”
- Select the volume in the sidebar and click the Delete button .If you are protecting an external volume, make sure it is connected to the computer.
- Type a name for the volume.
- Click the Format drop-down menu and select “Mac OS Plus (with registration, encrypted)”.
- Enter a password when prompted.
- To prevent recovery of deleted files, click “Security Options”, use the slider to select how many times you want to overwrite deleted data, and then click OK.
- Click Delete.
To change the password for your disk or partition, select it in the sidebar and select File> Change Password.