How to create a bootable macOS Catalina installation drive

An external drive that you can use as an installer for macOS Catalina is a useful thing to have. If you have multiple Macs to upgrade, it is much more efficient to plug in the USB installer and run the installer than to go to the App Store, download the 8.09GB OS installer and then run it .

In this article, I’ll walk you through the different ways you can create a bootable macOS Catalina install drive. But before I give instructions on how to make the unit, I’ll go over the items you’ll need and how to get them.

Macworld also has bootable installation drive instructions for:

Get an external drive and maybe an adapter

The macOS Catalina installation software is over 8GB, so you need an external USB drive that can hold that much data. The drive can be a pen drive, hard drive, or SSD.

IDG

A VisionTek USB drive connected to a 2017 MacBook Pro via Apple’s USB-C VGA Multiport Adapter ($ 69).

If you have a 2015 or newer MacBook or 2016 or newer …

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