Oct 24, 2011 This recipe will explain how to make a USB Thumb Drive bootable with the OS X Lion Developer Preview installer on it and in turn allow you to install Lion on a Mac without an optical drive (ie Macbook Air line). We will need a copy of the installer dmg (not provided) and a 4GB.
Create Mac OS X Lion USB Stick using Kakewalk. Download Mac OS X Lion from the Mac App Store. Start the Kakewalk application supplied with the zip archive you downloaded. Next, click Create install disk. Click Browse and locate your Lion application (this can also be a DMG image file). Make sure you choose the correct destination of USB stick. If you succeed in downloading the OS installation, your next step is to create a bootable USB or DVD and then reinstall the OS on your computer. How to download older Mac OS X versions via the App Store. If you once had purchased an old version of Mac OS X from the App Store, open it and go to the Purchased tab. Double-click to mount the image, “Mac OS X Install ESD,” on your desktop. Making your USB key bootable. With your Lion disk image mounted on the desktop, plug in your USB key and open Disk.
These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.
Find the appropriate download link in the upgrade instructions for each macOS version:
MyVolumein these commands with the name of your volume.
Yto confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created.
* If your Mac is using macOS Sierra or earlier, include the
--applicationpath argument, similar to the way this argument is used in the commands for Sierra and El Capitan.
After creating the bootable installer, follow these steps to use it:
For more information about the
createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal: