![]() Whichever method you use, you should be able to boot from your new USB drive either by changing the default Startup Disk in System Preferences or by holding down the Option key at boot and selecting the drive. Give it some time, and your volume will soon be loaded up with not just the OS X installer but also an external recovery partition that may come in handy if your hard drive dies and you're away from an Internet connection. The command will erase the disk and copy the install files over. Sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install\ OS\ X\ Yosemite.app -nointeraction Assuming that you have the OS X Yosemite installer in your Applications folder and you have a Mac OS X Extended (Journaled)-formatted USB drive named "Untitled" mounted on the system, you can create a Yosemite install drive by typing the following command into the Terminal. If you don't want to use Diskmaker X, Apple has actually included a terminal command that can create an install disk for you. The finished Yosemite boot drive, which also includes OS X's handy startup utilities. The process is outlined in screenshots below. Choose your disk (or partition) from the list that appears, verify that you'd like to have the disk (or partition) erased, and then wait for the files to copy over. It will then ask you where you want to copy the files-click "An 8GB USB thumb drive" if you have a single drive to use or "Another kind of disk" to use a partition on a larger drive or some other kind of external drive. If it doesn't detect the installer (or if you click "Use another copy"), you can navigate to the specific installer you want to use. Select OS X 10.10 in Diskmaker X, and the app should automatically find the copy you've downloaded to your Applications folder. It's still possible to create a disk manually using a Terminal command (which we'll go into momentarily), but Diskmaker X presents an easy GUI-based way to do it that is less intimidating to most people.
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