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4.2.10   Create OS X Install Disk

Once you’ve downloaded the OS X installer from the Mac App Store, this command helps you to create an installation disk. This makes it possible to re-install OS X or to install it on a different Mac without having to download it again. Additionally, if there are problems with a Mac’s hard drive, you may not be able to boot it and access the installer or recovery partition, but you will still be able to reinstall from the install disk that you create here. You can also use it as an emergency disk to boot a Mac and repair or reformat its hard drive, or to restore from a Time Machine backup.

It is recommended that you create your install disk before running the OS X installer, as the installer may delete itself (which would require you to download it again).


If you purchased Mac OS X 10.9 from the Mac App Store, you can create an install disk using a spare hard drive, USB flash drive, or SD card:

  1. When the prospective install disk shows up in the Finder, rename it to Mavericks. This disk will be completely erased and replaced by the Mavericks installer.

  2. From the Finder’s Go menu, choose Utilities, then open the Terminal application.

  3. Copy and paste these two commands into Terminal and press Return.

    cd /Applications/Install\ OS\ X\
    sudo ./createinstallmedia --volume /Volumes/Mavericks/ --applicationpath ../../
  4. Enter your Mac OS X admin password. You may also need to type Y to confirm that you want to erase the disk.

Mountain Lion or Lion

If you purchased Mac OS X 10.7 or 10.8 from the Mac App Store, DropDMG will help you burn an OS X install DVD. A dual-layer DVD (a.k.a. DVD+R DL) is required.

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