![]() From there launch “DiskMaker X 4b4”ģ.) The first window will welcome you to DiskMaker X and ask you to choose which OS you want to make a bootable install drive for. Drag the Mountain Lion on a rock to the Applications folder that the arrow is pointing to.Ģ.) Open Finder and go to your Applications folder. Here is our brief walkthrough for making an install drive:ġ.) Open the DiskMaker X disk image (.dmg) file and you will get a window with the application and a shortcut to the Applications folder. For a walkthrough of creating a bootable OS X Mavericks USB install drive, click here. So don’t forget to backup your data first!įor more about OS X 10.10 and its new features, check out our convenient Yosemite Compatibility and Transition Guide. It should be noted that DiskMaker X erases the volume or the drive you chose, according to the options you chose. All you need is an 8 GB (minimum) USB thumb drive, a USB, FireWire, or Thunderbolt drive or an SD-Card the OS X 10.10 Yosemite Installer from the App Store and the DiskMaker X application. Like the previous versions, DiskMaker X is free of charge (however, donations are accepted). Luckily, DiskMaker X helps fill the void by allowing you to make a bootable OS X 10.10 Yosemite USB install drive, making a task such as installing on several different machines easier. So if you previously relied on DVD installs, you will be unable to do so with this version. And like the previous versions of OS X dating back to OS X 10.7, Yosemite is only available for install via download from the Mac App Store. Update 09/2015: For help creating a bootable USB install drive for OS X El Capitan, click here.Īpple released the latest and greatest Mac operating system last month in the form of OS X Yosemite. The trick is to replace only the second occurrence, ie, use the createinstallmedia executable from the El Capitan installer.UPDATE 09/2017: Create a Bootable macOS High Sierra Install Drive with DiskMaker X 7 Replacing both occurrences 'El\ Capitan' with 'Mountain\ Lion' gives the expected message that createinstallmedia is not found inside the Mountain Lion installer (because it didn't exist back then when the installer was created). Sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app -nointeraction Instructions to create a bootable El Capitan (or Mavericks or Yosemite) installer on a computer running El Capitan all seem to rely on a small (command line) executable called createinstallmedia that is part of the OS X Install application (/Contents/Resources), even the GUI options like Disk Maker X seem to rely on it. Unfortunately the result doesn't appear to be bootable. These instructions cannot be followed to the letter anymore since Disk Utility has changed significantly in El Capitan but there still is a restore feature. Instructions to create a bootable Mountain Lion installer (on a computer running Mountain Lion) usually use the Restore feature in Disk Utility to 'restore' the bootable image inside the installer (InstallESD.dmg) to a USB stick (where 'restore' means cloning the disk image to the USB stick and making it bootable). ![]() But I have not found any instructions of how to create a bootable Mountain Lion installer under El Capitan. There are also instructions on how to create a bootable Mavericks or Yosemite installer under El Capitan. There are many instructions on how create a bootable Mountain Lion installer on a computer running Mountain Lion, a Mavericks installer on a Mavericks system up to an El Capitan installer under El Capitan. Trying to, you get a message that the copy of "Install OS X" is too old to be opened on this version of OS X. You need to make a bootable installer because the ML installer itself won't run under El Capitan. This requires that you have both the El Capitan installer as well as the Mountain Lion installer on your computer (at the paths indicated above, adjust the paths in the command if necessary) and that you have an HFS volume with the name 'Untitled' mounted (adjust the name in the command if necessary). Sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install\ OS\ X\ Mountain\ Lion.app -nointeraction If you ever wondered how to create a bootable OS X Mountain Lion installer under El Capitan, here is the Terminal command to do so:
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