Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
Connect the USB flash drive or other volume that you're using for the bootable installer. Mac Os X Installer Download Use the 'createinstallmedia' command in Terminal You will create the bootable installer from this app, not from the disk image or. It installs an app named Install OS X El Capitan into your Applications folder. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. Open the Terminal app and copy-and-past the following commands to make a booatble USB installer from macOS image.Įl Capitan downloads as a disk image. Open Disk Utility app and format the USB drive with APFS or Mac OS Extended. And backup the data in that USB drive as the installer erase all content from it. Now connect an external flash drive with more than 16G free space. Since there is no version of Universal USB Installer for Mac available, you might want to try other programs that can help you with this task. 
Universal USB Installer by Pendrive Linux is an open source application that will help you create a bootable USB flash drive containing Linux distribution. Starting with OS X Lion, Apple did away with DVDs and other media as a method of installing software and switched to a download model instead.Even so, it's still easy to create a USB installation disk for OS X Lion if you want to install Lion on a freshly formatted hard drive, if you're in an emergency booting situation, or if you need to repair your Mac's hard drive. Its latest version 10.11.6 (15G22010) was released on 9th July 2018, almost 7 months ago. Mac OS El Capitan was released to manufacturing on 20th September 2015, almost three and a half years ago.
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