Create Macos Catalina Usb Installer

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Today my Windows 10 bricked itself after I enabled Hyper-V, I had no choice but to reinstall it. I only had my Macbook to create the USB stick. Here’s how.

MacOS Catalina is one of the most exciting updates to Apple’s desktop platform in quite some time. There are many new features that are expected to change how our desktops and laptops work for the future. Make sure to create a macOS Catalina USB installer before you update your MacBook and start exploring Catalina features. Method 2: Convert.dmg to.iso and Create macOS Catalina Bootable USB. MacOS Catalina install image is distributed in.dmg format and Windows 10 has no support. Hen it is almost impossible to read such files in conventional ways. So in this part, we will convert macOS Catalina dmg file into ISO and create a bootable installer by burning the ISO.

First of all, find out which device is your USB stick:

Here it is /dev/disk3. Erase the device with

Next go to https://www.microsoft.com/en-us/software-download/windows10ISO to get the installer ISO file. After that mount the ISO:

Now copy the files from the ISO to our USB stick, but not the oversized install.wim:

Next up we’ll need to install wimlib, a tool that will help us manipulate .wim files through Homebrew. If you haven’t installed that already (how dare you!):

Then we can install wimlib:

Now split the oversized install.wim and save the files to USB stick:

Finally we can eject the USB stick with:

Now pull off your USB stick, plug it to your PC and boot it up to recover your machine! Good luck.


Create Macos Catalina Usb Installer Download

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
Create Macos Catalina Usb Installer

Additionally, the USB drive you expect to boot from. “Make Bootable USB Drive” click “” tab to open the iso record of the Windows working framework. Select the right USB drive from the “Goal USB Drive” list if various USB drives are associated with the PC. Pick the best possible composing strategy. “USB-HDD” is suggested. The first idea of creating macOS bootable USB from Windows using BDU isn’t like this. But there’s another author who also has the same idea but use the different tools. What I mean is the idea of using 7-Zip and Paragon Hard disk Manager, the credit of reference source is goes to OSX Arena. If you have more than one Mac you want to upgrade to macOS 10.15 Catalina but don't want to waste so much bandwidth downloading it for each machine, one option is to create a bootable installer on.

Create macos catalina usb installer windows 7

Create Bootable Usb Catalina

Download macOS

  • Nov 06, 2020 A bootable USB is super convenient to have on hand if you need to install or repair an operating system on your computer. You can easily make your own bootable USB that’s equipped with the operating system of your choosing. Whether you’re using Windows or a Mac, we’ll walk you through the process step-by-step.
  • Jul 14, 2020 Bootable USB installers offer an easy way to upgrade multiple Macs to macOS Catalina, to perform clean installs of MacOS Catalina, to perform maintenance from a boot disk like formatting disks, modifying disk partitions, and performing restorations, and much more. We’ll walk through how to create a boot USB install drive for MacOS Catalina 10.15.
Create macos catalina/high sierra usb installer windows 10 pc
  • 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

  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 and a gear icon labled Options.
  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.

Learn more

Create Macos Catalina Install Usb On Windows

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 the appropriate path in Terminal:

Bootable Catalina Usb Not Working

  • Big Sur: /Applications/Install macOS Big Sur.app/Contents/Resources/createinstallmedia
  • Catalina: /Applications/Install macOS Catalina.app/Contents/Resources/createinstallmedia
  • Mojave: /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia
  • High Sierra: /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia
  • El Capitan: /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia

How To Create A Bootable Usb For Macos Catalina

Bootable Usb Windows 10

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 Macos Catalina Usb Installer