How to Create a Bootable Installer for a macOS Sierra

Like Windows operating system, Apple used to supply an operating system CD of Mac to its customers. But this was the practice in days of yore. Now Mac users easily download and install the latest version of Mac. However, if they don’t find it comfortable, they never shy away from downgrading to the previous version. When it comes to downgrading, you wish you could create a bootable installer for macOS Sierra.

Well, it is possible now. You can make a bootable macOS Sierra installer. This bootable installer can be used on multiple Macs in your home or at office. To create a bootable installer, you need to use Terminal on your Mac; and if you are not good at using Terminal, you can create a bootable disk with the help of DiskMaker X.

Before moving ahead, you need to prepare yourself with a flash drive with at least 8GB space, or an external hard disk. Moreover, you need to download macOS Sierra from the Mac App Store.

This tutorial is broken down into three main units. First, you need to format your external drive; second, make your external drive into a macOS Sierra boot drive; and third, use macOS Sierra with a bootable drive.

How to Make a Bootable Installer for a macOS Sierra

How to Format External Hard Disk for macOS Sierra

Step #1. First of all, Plug in your external drive on your Mac.

Step #2. Now, click on finder from the dock.

Step #3. Click on Applications located on left hand side.

Step #4. Move down and double click on Utilities.

Step #5. Find Disk Utility and double click on it.

Step #6. Choose your external drive located under External on left side of the window.

Step #7. Click on Erase button located on the top of the window.

Step #8. Now, just remember the name of your external drive as you will need it while creating bootable drive. If you have more than one external drive having same name, then you will need to rename it.

Step #9. From the format list, you need to choose Mac OS Extended (Journaled)

Step #10. Click on Erase button.

Step #11. Once process gets completed, click on Done.

Step #12. Close Disk Utility window as the external drive is ready now.

How to Make External Drive Bootable for macOS Sierra

Step #1. Click on Finder from the dock.

Step #2. Click on Application from the left side.

Step #3. Move down and click on Utilities → Terminal

Step #4. Recall the name of your formatted external drive when typing the below mentioned text into Terminal. If it is not named “Untitled,” you need to change the command syntax for the pathname where it says: Volumes/Untitled. The name of the drive is case sensitive and it can’t have any spaces.

Step #5. Type the below code in terminal and don’t forget to change the name of your external drive instead on Untitled

sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ macOS\ Sierra.app

Step #6. From keyboard hit enter key

Step #7. Type your admin account password which you use for log in. Nothing will appear on the terminal screen after you enter password.

Once the process get completed you will done on the terminal window.

How to Use macOS Sierra with a Bootable Drive

Step #1. Turn off your Mac.

Step #2. Connect your external drive to Mac via USB port.

Step #3. Turn on your Mac and hold Option/alt key till you listen to the sound of startup chime.

Step #4. Choose external drive having macOS Sierra installed from the list of systems to get start up your Mac.

That’s it!

Also Check: How to Create a macOS 10.13 High Sierra USB Installer

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