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.

Mac users wishing to create a bootable install disk for Big Sur now need to use the createinstallmedia command in Terminal, and here’s how to do it. These instructions work to create a bootable install disk for all versions of macOS from macOS 11 Big Sur back to OS X El Capitan 10.11. Then Right-click on that flash you want to create bootable USB for Mac OS El Capitan then select Restore with Disk Image. What you need to create a bootable installer Os X El Capitan Bootable Usb 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. Create a bootable OS X El Capitan USB Drive: Making a bootable OS X El Capitan USB Drive is easy and doesn’t take very long at all. The OS of the older Mac has been corrupted and cannot boot. Yes I have downloaded El Capitan (InstallMacOSX.dmg) and renamed it to Capitan.app in the Applications folder. On the terminal, the. I read through it though but what I needed was a way to make a bootable El Capitan USB (for use in an older Mac) while on a newer Mac running Catalina.

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 El Capitan

  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:*

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

  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.

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.

Create Bootable Usb Mac El Capitan On Windows

Usb

Create Bootable Usb Mac Os Yosemite

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.

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:

Create a bootable OS X El Capitan USB Drive: Making a bootable OS X El Capitan USB Drive is easy and doesn’t take very long at all. There are a number of benefits to creating this type of boot drive, including the fact that it makes it very easy to install a fresh copy of the operating system you have configured on it.

Another benefit is that you will have a very easy time installing an operating system on a completely separate partition or on a virtual machine. By creating a boot disk you will have fast access to a portable installation whenever you need it.

  1. You will want to start off by connecting your flash drive to your Mac
  2. Download and Install the latest version of DiskMakerX (or check here how to download and use DiskMaker X step by step)
  3. Run DiskMakerX and click “Yosemite (10.10)“, as there is currently no other version available for El Capitan.
  4. Next you will want to select the install file and in the Applications folder select “Install OS X 10.11” and click “Choose”.
  5. Click “An 8 GB USB thumb drive” and select the flash drive you plugged into your Mac.
  6. Click “Erase” then create the disk.
  7. You will then need to click “Continue” and enter your administrator password when prompted.
  8. Once the process has finished, simply click “Quit”.

You will now have a working bootable OS X El Capitan USB drive to use whenever you want. You can choose to rename the drive to “El Capitan” as opposed to “Yosemite”. Because DiskMakerX does not yet have an option for El Capitan, it will automatically name is Yosemite.

Updates

  • Added a link for how to use DiskMaker X step by step (15.7.21).

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