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!

Prerequisites

• USB flash drive: It has at least 16GB of storage and make sure the data inside is backed up.
• Download the macOS Catalina installer file Catalina.dmg
• Install Disk Creator

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

Finished!