Generate multiple install partitions using the createinstallmedia tool of each OX 10.9+ version and add the other install partitions using disktool :.OS X Mountain Lion : MountainLionInstall.Create multiple partitions formatted as Mac OS Extended (Journaled).To create a USB installer for multiple OS X versions you can to go through the following procedure: The setup should take few to few dozens minutes depending on your USB drive. The output should be along these lines: Copying installer files to disk. Replace /Volumes/MavericksInstall with your own partition name: sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia -volume /Volumes/MavericksInstall -applicationpath /Applications/Install\ OS\ X\ Mavericks.app -nointeraction By default the path is /Applications/Install OS X Mavericks.app/Contents/Resources/createinstallmedia. It can be found in the Maverick install apk. Then in the terminal use the createinstallmedia command. We can fix the time by using Terminal.Edit: this also should work for El Capitan with a 6.33GB+ partitionĬurrently the best way seems to be through createinstallmedia, which is also Apple's recommended method.įirst create a Mac OS Extended (Journaled) partition on the USB key with 5GB or more: Unfortunately, the Mac OS X installer (or recovery partition) does not include System Preferences making it slightly more difficult to fix the time. If the time is not correct (can be caused by a dead clock battery) then the certificates will not match up.
Occasionally, the booted installer will complain about being corrupt and will refuse to install. Confirm when asked to wipe the installation media and wait for the process to complete.Typically, Install OS X Mavericks.app is stored in /Applications but can be stored elsewhere, -volume needs to be pointed towards your installation volume (in this case a flash drive called "Untitled").Run createinstallmedia /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install\ OS\ X\ Mavericks.app.Mount your installation volume (usually a flash drive).
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