Before we get started
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Improving your computer’s security is always a good idea, and Apple gives you several options of doing so. The one we will discuss today is how to set your Firmware password. Setting a Firmware password will prevent your computer from being booted to different volumes without requiring this password.
Setting a Firmware Password has become extremely easy with Mac OS X Lion. This simple tutorial will walk you through the process of setting your firmware password.
There are really only a couple steps you need to take to set the firmware password.
1) The first thing we’ll want to do is boot to the Recovery Partition. In case you’ve never done it, we’ll need to restart the computer by holding the Command key and the letter R on the keyboard (⌘R).
Now, if you happened to upgrade from Snow Leopard, and you had a Firmware password set, that password will no longer be valid. You will need to set a new one using the steps above.
And that’s really all there is to it!
For further security measures, you may wish to look at encrypting your drive with FileVault. However, this level of security is more than enough for the average Mac user.