Apple macOS in a boxed physical form, so it’s up to users to create their own USB-based installers. Thankfully, this process can be accomplished with just a single Terminal command. Here’s how to create a USB installer for macOS Sierra. Step 1: Download macOS Sierra from the Mac App Store To create a USB installer for macOS Sierra, you first need to download the installation application from the. Using a, simply launch the App Store, find Sierra from the homepage sidebar, and download the installer.
Once it has completed the download, the Sierra installer will automatically launch. Quit the install application, as this is meant for users who wish to upgrade their Macs to Sierra, not create a USB installer. You can quit the installer application by using the keyboard shortcut Command-Q. Step 2: Prepare the USB Drive To create a macOS Sierra USB installer, you’ll need a with a capacity of at least 8GB. The process of creating the USB installer deletes all data on the USB drive, so make sure it doesn’t contain any important files. With your USB drive connected to your Mac, launch the Disk Utility app. You can find Disk Utility by searching for it in or in Applications > Utilities.
If you succeed in downloading the OS installation, your next step is to create a bootable USB or DVD and then reinstall the OS on your computer. How to download older Mac OS X versions via the App Store. If you once had purchased an old version of Mac OS X from the App Store, open it and go to the Purchased tab. Installing macOS High Sierra is as simple as opening up Mac App Store and downloading it. However, there are instances where you might need to create a bootable USB flash drive for macOS High Sierra for a clean installation or to install on other Macs which might not have a fast Internet connection.
In Disk Utility, select your USB drive from the list on the left. Next, click Erase from the toolbar. We need to give the USB installer a temporary name in order for the Terminal command below to work.
If you plan to just copy and paste the Terminal command, name your USB drive “Sierra.” You’re free to change it, but you’ll need to modify the command to reference the new name. Make sure that Format is set to OS X Extended (Journaled) and Scheme is set to GUID Partition Map. Finally, click Erase to complete the process. Step 3: Create the macOS Sierra USB Installer With your USB drive ready, launch Terminal. As with Disk Utility, you can find Terminal via Spotlight or in Applications > Utilities. Copy and paste the following command into the Terminal window: sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Sierra --applicationpath /Applications/Install macOS Sierra.app --nointeraction This is a command, so you’ll need to enter your admin password when prompted.
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Terminal will then access the createinstallmedia tool built in to the Sierra installation bundle. You can monitor the progress of the process via the Terminal window. The time it takes to complete will vary depending on the speed and type of your USB drive, but shouldn’t be more than 5 minutes or so. Just be sure to let the command run uninterrupted until you see it report “Done,” at which point you can quit Terminal. At the end of the process, your new macOS Sierra USB installer will mount to your Mac’s desktop and will be ready for use. Step 4: Install macOS Sierra via USB Once you have your macOS Sierra USB installer, you can use it to install Sierra on compatible Macs in one of two ways.
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