Create Bootable Usb Mac

  

Jun 11, 2021 Part 1. Create a Bootable Installer for macOS on Mac. MacOS is the native operating system for all Mac computers. And Apple provides an official tool to create bootable USB installer from macOS installation app with the help of Terminal command, which is totally free. In addition, it is also possible to make a bootable macOS installer from DMG. It is available for Windows, Mac OS X, and Linux but with a separate file for each OS. The tool is specifically designed to create bootable Live USB drives for Ubuntu, Fedora, and other Linux distributions. UNetBootin lets you create bootable media by the use of ISO file and allows downloading the Linux distribution directly from the user. Advanced Mac users may wish to create a bootable installer drive for macOS Monterey 12 beta. The typical advantages to creating a bootable install drive is that you can obviously boot a Mac from it, which enables the ability to erase and format a Mac, as well as install macOS Monterey beta onto the Mac. TransMac creates a macOS USB bootable drive warning. Once you complete the steps, you can now insert the USB flash drive on your Mac computer to install, reinstall, or upgrade the operating system to the latest macOS version, which can be Sierra, Catalina, Big Sur, Monterey, or higher. Create a GPT partition on a USB flash drive.

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Create Bootable Usb Macos Lion

Applies To: Windows Server 2016 Essentials, Windows Server 2012 R2 Essentials, Windows Server 2012 Essentials

You can create a bootable USB flash drive to use to deploy Windows Server Essentials. The first step is to prepare the USB flash drive by using DiskPart, which is a command-line utility. For information about DiskPart, see DiskPart Command-Line Options.

Tip

To create a bootable USB flash drive for use in recovering or reinstalling Windows on a PC instead of a server, see Create a recovery drive.

For additional scenarios in which you may want to create or use a bootable USB flash drive, see the following topics:

To create a bootable USB flash drive

  1. Insert a USB flash drive into a running computer.

  2. Open a Command Prompt window as an administrator.

  3. Type diskpart.

  4. In the new command line window that opens, to determine the USB flash drive number or drive letter, at the command prompt, type list disk, and then click ENTER. The list disk command displays all the disks on the computer. Note the drive number or drive letter of the USB flash drive.

  5. At the command prompt, type select disk <X>, where X is the drive number or drive letter of the USB flash drive, and then click ENTER.

  6. Type clean, and the click ENTER. This command deletes all data from the USB flash drive.

  7. To create a new primary partition on the USB flash drive, type create partition primary, and then click ENTER.

  8. To select the partition that you just created, type select partition 1, and then click ENTER.

  9. To format the partition, type format fs=ntfs quick, and then click ENTER.

    Important

    If your server platform supports Unified Extensible Firmware Interface (UEFI), you should format the USB flash drive as FAT32 rather than as NTFS. To format the partition as FAT32, type format fs=fat32 quick, and then click ENTER.

  10. Type active, and then click ENTER.

  11. Type exit, and then click ENTER.

  12. When you finish preparing your custom image, save it to the root of the USB flash drive.

See Also

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.

What you need to create a bootable installer

  • A USB flash drive or other secondary volume formatted as Mac OS Extended, with at least 14GB of available storage
  • A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan

Download macOS

  • Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra
    These download to your Applications folder as an app named Install macOS [version name]. If the installer opens after downloading, quit it without continuing installation. 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.
  • Download: OS X El Capitan
    This downloads as a disk image named InstallMacOSX.dmg. 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

Create Bootable Usb Mac
  1. Connect the USB flash drive or other volume that you're using for the bootable installer.
  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 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.

Big Sur:*

Catalina:*

Create Bootable Usb Mac

Mojave:*

High Sierra:*

El Capitan:

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


After typing the command:

  1. Press Return to enter the command.
  2. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
  3. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased.
  4. After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume. Click OK to allow the copy to proceed.
  5. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur. You can now quit Terminal and eject the volume.

Use the bootable installer

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

Create Bootable Usb Mac Disk Utility

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes.
  3. Select the volume containing the bootable installer, then click Continue.
  4. When the macOS installer opens, follow the onscreen instructions.

Create Bootable Usb Mac

Intel processor

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
  3. Release the Option key when you see a dark screen showing your bootable volumes.
  4. Select the volume containing the bootable installer. Then click the up arrow or press Return.
    If you can't start up from the bootable installer, make sure that the External Boot setting in Startup Security Utility is set to allow booting from external media.
  5. Choose your language, if prompted.
  6. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more

A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.

Create

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