Create a Bootable Installer for macOS Catalina

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Mac Studio A: How to create Catalina Boot Disk. The Easy Way on How To Create Bootable USB macOS Catalina Installer. For Official Release macOS USB Boot Disk Installer. Create Catalina Bootable USB Installer the Easy Way.

One Line Terminal Command for macOS 10.15 Catalina OFFICIAL RELEASE:

(just copy and paster the one line Terminal Command Below in a Text Document and replace where it shows NameOfUSBDisk with the name of your USB flash drive name
)

No need to use Disk Utility to format or prepare your Bootable USB Catalina USB boot disk. The One Line Terminal Command Does that for you Automatically.

🎬 Table of Contents:
-----------------------------------
00:00 - Intro
00:07 - IMPORTANT - Time Machine Backup
00:20 - STEP-1
00:26 - STEP-2
00:33 - STEP-3
00:40 - STEP-4
00:45 - STEP-5
01:15 - FINAL-STEPS

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TRANSCRIPT:
In this episode, How To Create a macOS Catalina USB Boot Disk.

Before proceeding with the prep work, make sure you’ve done a backup of your Macintosh Disk, using for example Time Machine.

With that important message out of the way, Straight to the Demo.

Soooooooo, Let’s Get Started.

First, let’s Begin With The Prep Work:

1. You’re logged in with an Admin account on your Mac and running one of the following macOS.

2. You have at least an 16 GB blank USB 2.0 or 3.0 Disk.

3. Have a copy of macOS Catalina, and that’s located in the Applications folder.

4. Open TextEdit and Make document as plain text.

5. Copy and paste the following one line Terminal command, which I’ve included in the description, in the text document:

Now, with all the prep work taken care of, let’s begin creating the USB Boot Disk.

Insert your USB Disk in an available USB socket and note the name.

In my case, it's “USB1”.

From the text document created earlier, replace “NameOfUSBDisk” with the name of your USB Disk.

Final Steps:

Open Terminal and copy and paste the one line Terminal command from the text document, and press return.

You’ll then be asked to enter your Admin Password, and after pressing return, the creation of macOS Catalina USB Boot Disk Installer will begin.

I’ll just time-lapse it from here.

In My Case: Using a USB 3.0 disk, it only took just over 3-1/2 minutes to complete.

For a USB 2.0 disk, it took just over 30 minutes to complete.

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