macOS Sierra makes use of a new name for the Mac operating system, but the same clean install and upgrade install methods that are familiar to most Mac users are fully supported by the new OS.
Sep 20, 2016 The new Mac operating system offers more than a name change. MacOS Sierra version 10.12 moves Apple's desktop OS closer to its mobile counterpart, gaining Siri, Apple Pay, and more.
The clean install option is the installation method we will look at in this guide. Don’t worry if you would rather make use of the upgrade installation method; we've got you covered with a complete guide to upgrading to macOS Sierra.
Clean or Upgrade Install of macOS Sierra?
The upgrade install is by far the easiest method of upgrading your Mac to macOS Sierra. The upgrade install preserves all of your current user data, documents, and apps while upgrading the existing operating system on your Mac’s startup drive to macOS Sierra. The advantage is that once the upgrade is completed, your Mac is ready to go, with all your personal data intact and ready to be used.
The clean install option, on the other hand, replaces the contents of the target drive, wiping away any existing data on the drive and replacing it with a pristine copy of macOS Sierra. A clean install may be a good choice if you are experiencing software-based problems with your Mac that you have not been able to rectify. Just remember, that while a clean install may solve the issue, you are effectively starting over from scratch and all of your current user data and applications will be gone.
What You Need to Perform a Clean Install of macOS Sierra
Before we get too far along, a word about this guide. The clean install process we will outline in the guide will work for both the gold master version as well as the full released version of macOS Sierra
Before assembling any of the needed components for a clean install, you should verify that your Mac is able to run macOS Sierra.
Once you've determined that your Mac is capable of making use of the new OS, you should gather the following:
Once you have everything that's needed, you can move on to the next step.
macOS Sierra Clean Install Can Target Startup and Non-Startup Drives
There are two types of clean installs that can be performed with the macOS Sierra installer on your Mac. Each has slightly different requirements, but the end result is a pristine version of macOS Sierra installed on your Mac.
Clean Install on a Non-Startup Drive
The first type is to install the OS on an empty volume or drive, or at least on a target drive that you don’t mind being erased and losing all of its data.
This is the easiest type of clean install to perform. It doesn't require you to make a bootable copy of the installer since you can run the installer directly from your Mac’s startup drive.
Of course, for this method to work, you need to have an available second drive or volume that you can use. For most Mac models, this means an external drive of some type, which will become the target for the installation and will also become the startup drive whenever you choose to boot into macOS Sierra.
This type of installation is often used when you want to try out a new version of the Mac OS, but don't wish to totally commit to the new OS and want to be able to continue to use the older version. It's also a common method of installation for trying out a public beta of macOS.
Clean Install on Your Mac’s Startup Drive
The second type of clean install is performed by first erasing your Mac’s current startup drive, and then installing macOS Sierra. This method requires you to make a bootable copy of the macOS Sierra installer, and use it to boot from and then erase your Mac’s current startup drive.
This method will result in complete loss of all data on the startup drive but may be a good choice for some users. This is especially true if, over time, your Mac has accumulated quite a few bits of data debris, the sort of thing that occurs when you have a lot of apps that have been installed and uninstalled over time; this includes performing a lot of OS upgrades as well. The resulting problems can show themselves in a variety of ways, such as your Mac running slowly, having unusual startup issues or shutdown issues, crashes, or apps that don't run correctly or just quit on their own.
As long as the problem isn't hardware-related, reformatting the startup drive and performing a clean install of an OS may do wonders in reviving your Mac.
Let's Get Started: Clean Installing macOS Sierra
The main difference between the two clean install methods comes down to the target for the clean install.
If you're going to perform a clean install on the startup drive, you first need to create a bootable copy of the installer, boot from the bootable installer, erase the startup drive, and then install macOS Sierra. Essentially, follow this guide starting with the first step, and proceed from there.
If you're going to perform a clean install on a non-startup drive, you can skip most of the preliminary steps, and jump right to the point where you start the install of macOS Sierra. We suggest reading through all the steps anyway before you actually perform the installation so that you're familiar with the process.
macOS Sierra Clean Install Requires Erasing the Target Drive
To get started with a clean install of macOS Sierra on either a startup drive or a non-startup drive, make sure you have done the following:
Preliminary Steps for Clean Install on a Non-Startup Drive
In order to perform a clean install on a non-startup drive, you'll need to erase the target drive if it contains any of the other Mac operating systems. If the non-startup drive is already empty, or only contains personal data, then you can skip the erase process.
To erase the non-startup drive, use the instructions found in either:
After the non-startup drive is erased, you can jump to the next step to continue the install process.
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Preliminary Steps for Clean Install on a Mac Startup Drive
Start the Install of macOS Sierra
The startup volume has now been erased, and you're ready to start the actual installation process.
Select the Target Drive for a Clean Install of macOS Sierra
We mentioned earlier that there were two clean install options: to install on the startup drive or to install on a non-startup drive. The two installation methods are about to come together, following a common path.
If you chose to install on a non-startup drive, then you're ready to start the installation process. You'll find the macOS Sierra Installer in the /Applications folder. Go ahead and launch the installer.
If you decided to install macOS Sierra on your startup drive, then you have already erased the startup drive and started the installer, as outlined previously.
We're now ready for both types of installations to follow the same path.
Clean Install of macOS Sierra
Use the macOS Sierra Setup Assistant to Complete the Installation
Depending on the choice you make here, you'll have slightly different install options going forward. We'll make a note of when the installation process differs as you read on. Make your selection, and click Continue. So far, you've decided on the clean install method to use, erased the target drive, and started the installer. Your Mac has copied the needed files to the target disk and then restarted.
Welcome to macOS Sierra SetupMac Os Sierra Full Download
Apple Mac Os Sierra Download
The setup assistant will finish the setup process, and then display your Mac’s desktop. The setup is complete, and you're ready to explore your new macOS Sierra operating system.
Manual De Mac Os Sierra DownloadSiriManual De Mac Os Sierra 7
One of the new features of macOS Sierra is the inclusion of Siri the personal digital assistant that has been part of iOS for quite a few years.
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