[header] How to encrypt a mac hard drive with filevault 2 [title] Click the apple menu in the upper left corner followed by system preferences from the context menu. [title] Double-click the " security & privacy " icon. [title] Click the " filevault " tab. 
[title] Click the padlock in the bottom left corner of the security & privacy pane and enter your admin password when prompted to continue. [title] Click the " turn on filevault " button.