MacOS Catalina has just been released. In the following instruction, we will show you step by step how to make an Bootable USB of MacOS Catalina installation in Mac and Windows 10/8/7.
To be clear, our instruction will create an bootable USB of Catalina installer which can be used on a Mac or a virtual machine using VMWare Fusion and Virtual Box in MacOS only. We will release another topic for Hackintosh soon enough.
You will need an USB with at least 9Gb of space. The drive comes in 16, 32, 64, 128, and 256GB storage varieties, so it seems 16 Gb is your only choice.
How to create a Bootable Install macOS Catalina USB on a Mac?
Step 1: Download MacOS Catalina.app from App Store into Applications folder.
From your MacOS, it’s easy to download the official Install macOS Catalina.app from App Store into the Applications folder by just use the upgrade function (Apple Logo > About This Mac > Software Update…).
In the case you are using Catalina already, download the Install macOS Catalina.app from this topic, then move it into Applications folder.
Step 2: Plug your USB drive into your Mac.
Step 3: Open Terminal (found in Applications/Utilities/), the enter the following command line:
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/UNTITLED && echo Catalina Boot Drive Created
Make sure you replace “UNTITLED” with your USB flash drive name. For example, my USB drive is mount under “AppleHint” name, I did enter the following:
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/AppleHint && echo Catalina Boot Drive Created
You are then asked for administrator password (the password is used to login to your MacOS).
Next, Type Y then press the Return key to confirm the USB drive is going to be erased completely.
It then takes couple of minute to go through the whole processes. Here is the result.
This USB is ready to use to install the new Catalina on any Macs
How to make a Bootable Install macOS Catalina Installer USB in Windows 10,8,7,…
- Download the Bootable Catalina Installer.ISO from here. And then use a Free tool such as Rufus to restore the ISO image into the USB drive.
I personally recommend using TransMac to create a bootable USB of Catalina Installer in Windows.
Firstly, download Bootable Catalina Installer.DMG from here
Run TransMac, Select your USB drive from the left side, right mouse to choose “Restore with Disk Image”.
Click on Yes
Next, locate and select the Catalina Installer.DMG image
Click on OK button
One more time, click on OK button
And then it takes couple of minutes to restore the image.
You have just created successfully a Bootable USB of Catalina installer for a fresh install on Mac.