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How to create a bootable macOS Sierra installer drive
Instructions for making an external drive that you can use to install macOS Sierra.
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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 Mac operating systems. It’s convenient, but sometimes it can take a while for a download to finish. And if you have multiple Macs, it’s inefficient to download 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 purpose of installing the Mac operating system. When I need to tend to a bunch of Macs, it’s much faster to use a bootable drive instead of going to each Mac, launching the App Store, searching for the operating system, downloading it (after entering my Apple ID), and then running the installer.
You can create a bootable USB flash drive with the macOS Sierra installer that’s now available. The installer software will take up nearly 5GB of storage space. Here’s how to create a bootable macOS Sierra installer drive.
Macworld also has bootable-install-drive instructions for:
* mac OS High Sierra (10.13)
* El Capitan (OS X 10.11)
* Yosemite (OS X 10.10)
* Mavericks (OS X 10.9)
* Mountain Lion (OS X 10.8)
* Lion (OS X 10.7)
Download the macOS Sierra installer
Launch the App Store app, then look for macOS Sierra in the store. (Here’s a link.) Click on the Download button, and your Mac will download the installer to your Applications folder. If it automatically launches after download, quit the installer.
sierra beta installer app folder sierra gmKeep the installer in the Applications folder.
If you’ve already upgraded your Mac to Sierra, the installer is removed from the Applications folder. You can download it again if you go to Purchased in the App Store. Look for macOS Sierra in the list of apps that you’ve bought, and click on the Download button. If it automatically launches after download, quit the installer.
Get an external drive
You can use a USB flash drive or a hard drive with room for the installer software. I’ve used different drives with success, including a VisionTek 120GB USB 3.0 Pocket Solid State Drive ($83 on Amazon) and an old 8GB Iomega Micro Mini Hard Drive.
Don’t worry if the drive isn’t formatted for the Mac. The drive will be reformatted automatically as part of the process. Change the name of your drive 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’t want to use Terminal, there are a couple of free apps you can use.
* Install Disk Creator is a straightforward way to create a boot disk. I
was able to make a macOS Sierra external USB boot disk in a few
minutes, and the installation worked without a hitch. Also works with
older versions of OS X.
* Diskmaker X is a popular app. It also supports older versions of OS X.
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 in place. Now you’re going to use Terminal to create a boot drive. If you’ve never used Terminal before, don’t worry. This is pretty easy.
Here are the steps to create a macOS Sierra beta boot disk. (Apple also has these instructions.)
1. Connect the external drive to your Mac. (In the Terminal command you
will use, I use Untitled to represent your external drive. If your
drive is named something else, you need to change Untitled to the name
of your drive.)
2. Launch Terminal (/Applications/Utilities/Terminal.app).
3. Copy the following:
sudo /Applications/Install\ macOS\
Sierra.app/Contents/Resources/createinstallmedia --volume
/Volumes/Untitled --applicationpath /Applications/Install\ macOS\
Sierra.app
4. Go back to Terminal and paste the copied code at the prompt. sierra
install disk terminal 01
5. Terminal will ask for a password. This is your user password. Terminal
doesn’t display characters when you type it in. Hit Return.
6. Terminal will tell you that it will erase your drive. To confirm that
you want to continue, type Y and hit Return. sierra install disk
terminal 02
7. You’ll see that Terminal erases your drive. When that part is done,
your Mac may ask you if you want to use the drive for Time Machine.
Click Don’t Use. sierra drive time machine
8. Terminal will copy the installer file to your drive. This will take a
few minutes. sierra install disk terminal 03
9. After copying, Terminal is done. You should see Terminal display a
“Copy complete” and Done notice. You can quit Terminal and your drive
is ready for use. sierra install disk terminal 04
How to boot from the installer drive
1. Plug your external drive into your Mac.
2. Power up (or restart) your Mac. Press down on the Option key while the
Mac boots.
3. After a few moments, your Mac should display the Startup Manager,
which will show you the available boot drives. Click on the external
drive and hit Return. (You don’t need to select a network to proceed.)
4. Your Mac will display an OS X Utilites window. If you want to install
Sierra and leave the data intact, select Install OS X. If you want to
start over and wipe out the data, you need to go into Disk Utility to
reformat the internal drive first, and then install macOS Sierra.
sierra installstartup option
What to do when ‘this copy of the install OS X application cannot be
verified’ or ‘the installer payload failed signature check’
To comment on this article and other Macworld content, visit our Facebook page 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 at MacUser, and he's worked for MacAddict, Mac|Life, and TechTV. He's also written for MacRumors and Realtor.com.
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