If you want to do a clean install of macOS Sierra, or you have multiple Macs to install it on, then a bootable flash drive for is your best bet for easy installation. Here’s how to make one.

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The Easy Option: Disk Creator
The easiest way to create a USB flash installer is with the free program, Disk Creator.
So, next, we will create a step-by-step guide to show you how to use EaseUS USB image tool to create a backup image of USB drive. To create a full image backup of USB drive: Step 1. Connect your device to PC, launch EaseUS image tool and click 'Disk/Partition Backup'. Choose the USB device as the source disk and select the destination disk where you want to save the backup image. Finally, click 'Proceed' to image USB drive. How to format a USB stick on a Mac Sometimes you need to format (completely erase) an USB stick to restore it to its full capacity. Here's how to format an USB stick on a Mac.
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- Download the macOS Sierra installer and Disk Creator.
- Insert an 8GB (or larger) flash drive. If you have any other data on that flash drive, back it up now, because the installer will delete everything on it.
- Open Disc Creator and click the “Select the OS X Installer” button.
- Find the Sierra installer file. This is should be located in your Applications folder.
- Select your flash drive from the drop-down menu.
- Click “Create Installer.”
When it’s done, insert your USB drive into any Mac, then launch the installer by holding down the Option key when you boot up your computer.
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The DIY Option: Terminal
If you don’t want to download an extra bit of software, you can make your own installer USB drive using Terminal.

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- Download the macOS Sierra installer.
- Insert an 8GB (or larger) flash drive and give it a name. For this tutorial, we’ll use the name
Untitled
. Make sure the drive is formatted for OS X Extended (Journaled). If it isn’t, open up Disk Utility and format is so it is. Before you do so, back up any important data on that drive. It’s best to disconnect any other external hard drives or flash drives so you don’t mix them up. - Open up Terminal (Applications > Utilities).
- Type (or copy and paste) this command into Terminal, replacing
Untitled
with the name of your drive, then press Enter:sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install macOS Sierra.app --nointeraction &&say Done
- Type in your password when prompted and press Enter.
- Let the command line do its work and don’t interrupt it until you see the final line that says
Done
. This can take a while, so be patient.
Pfsense
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When it’s done, insert your USB drive into any Mac, then launch the installer by holding down the Option key when you boot up your computer.