Create A Bootable USB Disk for Catalina macOS

Recently, I needed to install the Catalina Mac System on my MacBooks. So I decide to make a bootable USB disk myself.

Let’s get started!


  • USB flash drive: It has at least 16GB of storage and make sure the data inside is backed up.

Install Steps

  1. Open LaunchPad→ Disk Utility

2. Format/Erase USB driver

3. Open the Catalina.dmg, then drag the file macOS Catalina into the application folder

4. UseInstall Disk Creator to create an installer


Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store