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There are various reasons why you would need a macOS installer. Maybe you need it to reinstall macOS to fix a problem in your system or perhaps you’re planning to sell or hand down your old Mac to a new owner. It’s also possible that you’re the recipient of that old Mac. Similarly, there are also various ways to reinstall macOS. Aside from using recovery mode to reinstall macOS, you can also choose to make Mac boot from USB. In this article, we’ll show you how to make bootable USB so you can install macOS or an older version of it in case you can’t or don’t want to reinstall using recovery mode and other methods.

What You’ll Need to Create a Bootable MacOS Installer

There are two primary items you need to create a bootable USB to reinstall macOS. First, is the USB flash drive. You need one with at least 12GB of free storage. Even though the installation file size of High Sierra is 4.8GB, Apple recommends that you have 12GB storage available on your flash drive to allow for a more secure and stable installation. It will be best to use a Flash memory stick, but if you’re using a portable hard drive, we recommend USB 3.0, USB Type C, or Firewire. The next thing you need is the macOS installation files. You can get these from the Mac App Store.

Mar 12, 2020  After creating the bootable installer, follow these steps to use it: Plug the bootable installer into a compatible Mac. Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. Your Mac will start up to macOS Recovery. Apr 06, 2020  How to Make a Bootable USB on Mac? Creating a bootable USB on Mac is a two-step process. First, you need to download a specific macOS version from the Mac App Store. Second, write all the necessary files to a USB drive using the special createinstallationmedia command. That is how you create a bootable USB on Mac that in turn. Create Bootable USB for Mac on Windows 10, Mac and Windows file system is completely different, so you are not able to create bootable USB for Mac with PowerShell, CMD or Rufus.If you remembered, till MacOS sierra the Apple file system was Hackintosh, but MacOS 10.13 High Sierra has the technology of Apple Filesystem. That’s why we can’t create bootable USB with Windows tools. Method #1: Create A Bootable Windows 10/8/7 USB on Mac with Bootcamp. As a dual-boot booting tool, Boot Camp Assistant is highly regarded in the field of creating Windows 7/8/10 bootable USB since it was released, it provides the ability to download drivers, re-partition, and add new partition on your Mac. Some of the steps to create a bootable USB stick could be done in the GUI as well, but as some of them can’t and you have to go to the shell anyway, I decided to do all of the steps in the shell. Convert the ISO to UDRW format. Mac OS X provides all the tools needed to convert the ISO image to UDRW.

Jul 07, 2020  A trial copy of the TransMac software. One high quality USB flash drive with 16GB of storage. A copy of Apple’s macOS (DMG file). Create macOS bootable USB installation media. To create a bootable USB drive with macOS, use these steps: Download and install TransMac on your Windows PC. Dec 01, 2016  This tutorial will help you create a bootable USB flash drive for your Mac on a Windows computer. In order for this to work you should have a USB flash drive. The one I used in my tutorial was.

How to Get MacOS Installation Files

Here’s how to get installation files if you are installing macOS High Sierra.

• Launch the Mac App Store on your Mac.
• Locate macOS High Sierra. If you have purchased or downloaded it before, you can look for it in your Purchased tab.
• Click Download. You will get a message warning you that macOS 10.13 is already installed on the computer. Just click Continue.
• Your Mac will now download the installer file. It will be saved in the Applications folder. The downloading process may take some time, and the speed will depend on your Internet connection. The download process might be faster if you connect to the Internet via ethernet.
• If the installer automatically launches after the download has finished, choose Quit right away. You don’t want to commence the installation process because doing so will delete the driver.
• Go to Applications folder, which you can access via Finder.
• If you are creating a bootable installer for an older macOS version, you can also look for its installation files in the Purchased tab.

How to Create a Bootable MacOS Installer

Now, here’s how to create a bootable USB for macOS.

• Connect your USB flash drive to the computer.
• Open Terminal, which can be found in the Utilities folder within the Applications folder. For the purpose of this article, we will assume that the installation files are still in your Applications folder and your USB flash drive’s name is USBBoot. Replace USBBoot accordingly when you do these steps yourself.
• Type or paste the following commands in Terminal if you are installing High Sierra:

sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume –applicationpath /Applications/Install macOS High Sierra.app

• Type or paste the following commands in Terminal if you are installing Sierra:

sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume –applicationpath /Applications/Install macOS Sierra.app

• Type or paste the following commands in Terminal if you are installing El Capitan:

sudo /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume –applicationpath /Applications/Install OS X El Capitan.app

• Type or paste the following commands in Terminal if you are installing Yosemite:

sudo /Applications/Install OS X Yosemite.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume –applicationpath /Applications/Install OS X Yosemite.app

• Type or paste the following commands in Terminal if you are installing Mavericks:

sudo /Applications/Install OS X Mavericks.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume –applicationpath /Applications/Install OS X Mavericks.app

• Press Return.
• Type in your administrator password when asked. Press Return. Note that Terminal will not show any characters as you type your password.
• Type Y when prompted to confirm that you want to erase the volume. Press Return again. The terminal will now show the progress as the bootable installer is being created.
• The Terminal will tell you when the process is done. Your flash drive will now have the name of the installer you created, for instance, Install macOS High Sierra.
• Quit Terminal and eject the USB flash drive or hard drive.

So, there you have it. Creating a bootable USB macOS installer is quite easy, although downloading the installation files themselves may take time. Once you’ve successfully re-installed macOS, don’t forget to install Tweakbit MacRepair, which can help you take better care of your Mac.

These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

Software To Create Bootable Usb On Mac Windows 10

Download macOS

Create Bootable Mac Os Usb

Find the appropriate download link in the upgrade instructions for each macOS version:

macOS Catalina, macOS Mojave, ormacOS High Sierra
Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation. Important: To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.

OS X El Capitan
El Capitan downloads as a disk image. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.

Use the 'createinstallmedia' command in Terminal

1. Connect the USB flash drive or other volume that you're using for the bootable installer. Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
2. Open Terminal, which is in the Utilities folder of your Applications folder.
3. Type or paste one of the following commands in Terminal. These assume that the installer is still in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace MyVolume in these commands with the name of your volume.
   Catalina:*
   Mojave:*
   
   High Sierra:*
   El Capitan:
   
4. Press Return after typing the command.
5. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
6. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created.
7. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Catalina. You can now quit Terminal and eject the volume.

* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument, similar to the way this argument is used in the command for El Capitan.

Use the bootable installer

After creating the bootable installer, follow these steps to use it:

1. Plug the bootable installer into a compatible Mac.
2. Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. Your Mac will start up to macOS Recovery.
   Learn about selecting a startup disk, including what to do if your Mac doesn't start up from it.
3. Choose your language, if prompted.
4. A bootable installer doesn't download macOS from the Internet, but it does require the Internet to get information specific to your Mac model, such as firmware updates. If you need to connect to a Wi-Fi network, use the Wi-Fi menu in the menu bar.
5. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more

For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:

Catalina:

Mojave:

High Sierra:

El Capitan: