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When the.dmg is expanded it creates a file named 'macvexe'.
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As a note - the file OS X Yosemite 10.10 build 14A389 dmg.dmg was located in the Trash. I moved the file 'Install OS X Yosemite (5.17 GB) to a safe location on the HD of my iMac and also to my external HD.
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Once booted, you'll be able to install or upgrade Yosemite as you normally would.So I downloaded Yosemite 10.10 and, like you said, quit the Installer. 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
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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. An administrator account on the Mac you're using to create the disk.ĭiskmaker X has actually been around since the days of OS X 10.7 (it was previously known as Lion Diskmaker), but it's more important now because Apple has made alterations to the installer that prevent easy USB drive creation using the built-in Disk Utility app.
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This app is free to download, but the creator accepts donations if you want to support his efforts.
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For instance, if you find yourself doing multiple installs, a USB drive may be faster than multiple downloads (especially if you use a USB 3.0 drive). Things have proceeded remarkably smoothly since version 10.7 switched to download-only installers, but there are still good reasons to want an old, reliable USB stick. Further Reading OS X 10.10 Yosemite: The Ars Technica ReviewIt was 2009 when Apple last released a new operating system on physical media.