![]() ![]() ![]() Write the installation files to the image (this step requires administrator privileges).Hdiutil attach /tmp/ElCapitan.dmg -noverify -nobrowse -mountpoint /Volumes/my_bootdisk Mount the blank image to a temporary mount point.Hdiutil create -ov /tmp/ElCapitan -size 7316m -layout SPUD -fs HFS+J Create a blank image file in the temp folder, overwriting any existing file that may exist.Download El Capitan installer from Apple.The steps presented below can be used for other versions of OS X by increasing the size of the image as necessary and adjusting the name of the files appropriately (from El Capitan). ![]() Copy this application to a writable Mac OS Extended formatted disk and reopen it to continue installation. The Install OS X El Capitan application can’t be used from this disk. The resulting disk is bootable, but when trying to install the operating system you will receive the error: Note – the ISO created from this method does not work when burned to DVD. These are performed on an OS X system to create a bootable ISO which can then be imaged to USB or used directly for installing on virtual machines. The steps in this guide are what I found to be the most straight forward compared to other guides. There are also several methods to create an ISO, such as colt2’s method linked below. Apple has steps to create a bootable USB (linked below), but not an ISO file. ![]()
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