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Instructions for making an external drive that you can use to install macOSSierra.
OS X El Capitan Installer. Official OS X El Capitan Installer from the Mac App Store. Un-archive the zip archive and you will get the app Installer. A bootable ISO or bootable USB can be made from this installer. Instructions on how to do that are on the Internet/Youtube. Mac OS X El Capitan released 09/30/15 but where is it??? The answer is that it may not yet be available for download in your location. When Mac OS X El Cap.
Roman Loyola By Roman Loyola
Senior Editor, Macworld | Jul 3, 2017 1:32 PM PT
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Apple uses its App Store to distribute its software, like new Macoperating systems. It’s convenient, but sometimes it can take a while fora download to finish. And if you have multiple Macs, it’s inefficient todownload the new OS to each and every Mac.
sierra external icon
That’s why I like to make a bootable external drive for the sole purposeof installing the Mac operating system. When I need to tend to a bunch ofMacs, it’s much faster to use a bootable drive instead of going to eachMac, launching the App Store, searching for the operating system,downloading it (after entering my Apple ID), and then running theinstaller.
You can create a bootable USB flash drive with the macOS Sierra installerthat’s now available. The installer software will take up nearly 5GB ofstorage space. Here’s how to create a bootable macOS Sierra installerdrive.
Download the macOS Sierra installer
Launch the App Store app, then look for macOS Sierra in the store. (Here’sa link.) Click on the Download button, and your Mac will download theinstaller to your Applications folder. If it automatically launches afterdownload, quit the installer.
sierra beta installer app folder sierra gmKeep the installer in theApplications folder.
If you’ve already upgraded your Mac to Sierra, the installer is removedfrom the Applications folder. You can download it again if you go toPurchased in the App Store. Look for macOS Sierra in the list of apps thatyou’ve bought, and click on the Download button. If it automaticallylaunches after download, quit the installer.
Get an external drive
You can use a USB flash drive or a hard drive with room for the installersoftware. I’ve used different drives with success, including a VisionTek120GB USB 3.0 Pocket Solid State Drive ($83 on Amazon) and an old 8GBIomega Micro Mini Hard Drive.
Don’t worry if the drive isn’t formatted for the Mac. The drive will bereformatted automatically as part of the process. Change the name of yourdrive to Untitled; you need to do this for the steps below.
The quick and easy way
The process detailed below involves the Terminal. If your really don’twant to use Terminal, there are a couple of free apps you can use.
Use the Terminal to create a boot disk
terminal mac el capitan icon
So you have your external drive, and the Sierra beta installer is inplace. Now you’re going to use Terminal to create a boot drive. If you’venever used Terminal before, don’t worry. This is pretty easy.
Here are the steps to create a macOS Sierra beta boot disk. (Apple alsohas these instructions.)
How to boot from the installer drive
sierra installstartup option
Mac Os El Capitan App Store Link
To comment on this article and other Macworld content, visit our Facebookpage or our Twitter feed.Related:* Macs* Operating Systems* MacOS Hints* MacBooks* Mac Desktops* macOS* MacOS Sierra
Roman has covered technology since the early 1990s. His career started atMacUser, and he's worked for MacAddict, Mac|Life, and TechTV. He's alsowritten for MacRumors and Realtor.com.
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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.
What you need to create a bootable installer
- A USB flash drive or other secondary volume formatted as Mac OS Extended, with at least 14GB of available storage
- A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan
Download macOS
- Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra
These download to your Applications folder as an app named Install macOS [version name]. If the installer opens after downloading, quit it without continuing installation. To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server. - Download: OS X El Capitan
This downloads as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.
Use the 'createinstallmedia' command in Terminal
- Connect the USB flash drive or other volume that you're using for the bootable installer.
- Open Terminal, which is in the Utilities folder of your Applications folder.
- Type or paste one of the following commands in Terminal. These assume that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace
MyVolumein these commands with the name of your volume.
Big Sur:*
Catalina:*
Mojave:*
High Sierra:*
El Capitan:
* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument and installer path, similar to the way this is done in the command for El Capitan.
After typing the command:
- Press Return to enter the command.
- When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
- When prompted, type
Yto confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased. - After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume. Click OK to allow the copy to proceed.
- When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur. You can now quit Terminal and eject the volume.
Use the bootable installer
Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:
Apple silicon
- Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
- Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes.
- Select the volume containing the bootable installer, then click Continue.
- When the macOS installer opens, follow the onscreen instructions.
Install El Capitan App
Intel processor
- Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
- Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
- Release the Option key when you see a dark screen showing your bootable volumes.
- Select the volume containing the bootable installer. Then click the up arrow or press Return.
If you can't start up from the bootable installer, make sure that the External Boot setting in Startup Security Utility is set to allow booting from external media. - Choose your language, if prompted.
- Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.
Learn more
A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.
El Capitan Installer Download
For information about the createinstallmedia command and the arguments you can use with it, make sure that the macOS installer is in your Applications folder, then enter the appropriate path in Terminal: