If you have a Mac, you've probably been anticipating the release of OS X Mountain Lion. If you have multiple Macs, you've probably been dreading the long process of downloading and installing it on all of them. Here's how to create a bootable backup disk and save yourself some time. This is useful when attempting to install an operating system (e.g., Windows) on a computer that doesn't have a CD/DVD reader. You can make a USB bootable on a Windows or Mac computer by using Command Prompt or Terminal, both of which are free programs.

When you use Startup Manager to select a startup disk, your Mac starts up from that disk once, then returns to using the disk selected in. • Press and hold the Option key immediately after turning on or restarting your Mac. • Release the Option key when you see the Startup Manager window.

If your Mac is protected by a, you can release the key when you're asked to enter the password. • Select your startup disk, then click the arrow under its icon, or press Return.

If you press and hold the Control key during this step, your selection is saved in Startup Disk preferences, so it persists until you change it. If your Mac is using OS X Lion 10.7.3 or later, you can also use this method to start up from your. Startup Manager identifies your Time Machine backup as ”EFI Boot.”.

If you're in and can't see your startup disk, press Option-Shift-Command-Period. If that works, do this each time you want to start up from the device or from a startup disk connected to it. To enhance system security, Mac computers with up-to-date software don’t show devices that have Option ROM firmware until you press these keys in Startup Manager to load the firmware. On Mac models from early 2015 or earlier, you can disable this security feature to load Option ROM firmware automatically.

This removes an important protection against potential unauthorized access to your Mac by other people with physical access to it. • Open the Terminal app, which is in the Utilities folder of your Applications folder. • Type sudo nvram enable-legacy-orom-behavior=1, then press Return. To undo this command, enter sudo nvram -d enable-legacy-orom-behavior. If you're, the ability to load Option ROM firmware automatically or manually is disabled as an additional security protection.

If you want to remove this additional protection but keep your firmware password: • Open the Terminal app, which is in the Utilities folder of your Applications folder. • Type this command, then press Return: sudo firmwarepasswd -setmode command -allow-oroms To undo this command, enter sudo firmwarepasswd -setmode command. • Type the administrator password for your user account, then press Return. • Type your firmware password, then press Return. • Restart your Mac. Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement.

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