Even with your files encrypted with FileVault, someone could grab your laptop, enter Recovery Mode and wipe your hard drive clean and start fresh. While this keeps your files from being stolen, it doesn't prevent others from happily using your Mac after a fresh install of OS X. A firmware password is a hardware-based encryption tool that requires a password when booting to Recovery Mode or from an external drive.
To create a firmware password, you will need to reboot your Mac and enter Recovery Mode by holding down Command-R when it begins to boot up. When the OS X Utilities screen appears, click on the Utilities menu in the menu bar and select Firmware Password Utility. Next, click Turn On Firmware Password, enter a password, and click the Set Password button. Finally, click Quit Firmware Password Utility, and choose Restart from the Apple menu in the upper-left corner.
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