Clean Install macOS Sierra on MAC – [Guide]


See this step-by-step guide to clean install macOS Sierra on MAC in minutes. In this tutorial we are going to show you how to download, clean install and setup latest version of macOS Sierra 10.12.1 on iMac and Macbook desktop & laptop. Apple has released its new operating system for MAC computers, the macOS Sierra, after extensive beta testing and improvements. You can now easily fresh install macOS Sierra on MAC desktop/laptop by following a set of steps mentioned below in this post. But many choose to avoid installing beta versions of the MAC operating system since it may contain bugs and errors. Finally full and final macOS Sierra 10.12.1 latest version has been released by Apple. You can either get macOS Sierra via OTA update or clean install v 10.12.1 on MAC. Clean installing macOS Sierra is recommended and safer method compared to OTA update.

We are going to explain the macOS Sierra clean install process in simplifies steps, so that anyone can fresh start with the latest version of Apple’s MAC operating system without any errors or bugs on iMac or MacBook.

A clean install is an operating system (OS) installation that overwrites all other content on the hard disk. Unlike a typical OS upgrade, a clean install removes the current operating system and user files during the installation process.

Clean Install macOS Sierra For Best Performance on MAC

Before You Start

There are some prerequisites that must be met in order to complete successful installation of macOS Sierra on your MAC.

First of all make sure all important data on your MAC is properly back up in a safe storage device. You can backup data on MAC using Time Machine or external storage device.

Make sure you MAC is compatible with macOS Sierra 10.12.1 before starting the clean install process. Here’s a complete list of macOS Sierra compatible MACs:

  • MacBook (Late 2009 or newer)
  • MacBook Pro (Mid 2010 or newer)
  • MacBook Air (Late 2010 or newer)
  • Mac mini (Mid 2010 or newer)
  • iMac (Late 2009 or newer)
  • Mac Pro (Mid 2010 or newer)

You will need a macOS Sierra bootbale USB flash drive. Here’s a guide on how to create macOS Sierra bootable USB drive. You can refer to the guide in the link to clean install any version of macOS Sierra, now and in future.

How To Clean Install macOS Sierra on MAC – (Any Version)

Before starting, once again, ensure that you have a compatible MAC and a macOS Sierra bootable USB flash drive ready.

Also, Download macOS Sierra 10.12.1 (latest version).

Note: After downloading, MAC will try to walk you through the installation process, since we don’t want to upgrade the OS, but want to clean install it, therefore, quit the installer after downloading macOS Sierra latest version.

Step 1 – Plug-in the bootable macOS Sierra USB drive, and reboot your MAC.

Step 2 – Press the ‘Option’ key as soon as MAC boots-up to enter a new menu with different boot-up options.

Step 3 – In boot-up menu, select the bootable USB drive that you just plugged-in to MAC and hit Enter.

Step 4 – Wait for the bootable USB flash driver installer to load while it checks and runs processes in the background.

Step 5 – After that, a macOS Utilities menu will appear. Here, select the ‘Disk Utility’ option, and then hit the Continue button.

Step 6 – On the left-hand side of the disk Utility, make sure main MAC hard drive is selected on which the previous macOS or any other MAC OS X version is installed, and then hit the ‘Erase’ button. Please make sure that in the name field the name of the HDD drive stays “Macintosh HD”, and Format is selected as “Mac OS Extended (Journaled)”. After that hit the Erase button. Before hitting erase make sure MAC data is properly backup as this will wipe out all existing data on MAC.

Step 7 – Now your MAC doesn’t have any operating system installed on it. After the data deletion, hit the red button on the top-left corner, which will take you back to the macOS Utility menu. This time, select ‘Install macOS’ option on the list and hit Continue button.

Step 8 – Follow the on-screen instructions as prompted. Make sure that Macintosh HD is selected as the main hard drive on which to install macOS Sierra, and hit the Install button.

That’s all. Once the installation process is complete, you can start using latest macOS Sierra on your MAC with loads of new features. Close all other processes and tasks during the installation to ensure everything goes smoothly. Depending on the speed of your computer, the entire process of fresh macOS Sierra installation on MAC could take around 30 odd minutes.

Final Thoughts

Clean install process is usually recommended by experts because it offers greater performance and stability as well as keep the battery life on MacBooks intact. On the other hand, a clean install of macOS Sierra takes more effort for backing up and restoring files, and creating a flashable USB drive compared to OTA update method. However, all this effort is worth it as you will be able to have working macOS Sierra version with to install anytime you want, moreover, it results in smooth functioning of the operating system as if you just bought a new MAC.

Share you thoughts on macOS Sierra installation methods and which method, fresh install or OTA, you personally prefer and why in the comments section below.

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