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Is it possible to set up Mac OS X 10.8 (Mountain Lion) on a MacBook Air so that users cannot boot from external media (e.g. a USB memory stick) and cannot restore the OS from the internal restore partition?

  • what about bless command? user can still bless external drive and boot from it. is there a way to prevent from it? – user146746 Sep 15 '15 at 2:10
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The secure way is to set up Firmware password.

That will block any attempts from booting from outside, but it will require you to enter the password when booting up.

Here is a sample what it does:

enter image description here

How to do it: OS X Lion and Mountain Lion come with OS X Recovery > http://support.apple.com/kb/HT4718

This allows you to reinstall OS X, browse the web, repair drives and set up a firmware password, too.

First of all, hold Command and R keys while your computer is starting to start in OS X Recovery.

enter image description here

Then, go to Utilities menu (on the menu bar) and open the Firmware Password Utility, which will allow you to set up the firmware password.

Don't lose it because it's not possible to reset it without knowing this firmware password

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