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In this article, you will learn how to create bootable macOS Catalina USB Installer Drive. If you have thinking that why should we make USB Installer? Then the answer is simple. When you are going to install macOS Catalina on multiple Apple laptop and Desktop computers. Then, to download and install macOS Catalina one by one on each machine consumes much time and data. Therefore, you have to make simple bootable USB installer drive and start to install it on multiple machine without downloading again and again.

MacOS Catalina is the latest Mac Computer Operating system released by Apple Inc. To install macOS Catalina on any Mac Computer or Mac Laptop you need to download the macOS Catalina DMG File. Which is free to download from Apple official website, but for that, you need to have a developer account. An external drive that you can use as an installer for macOS Catalina is a handy thing to have. If you have multple Macs to upgrade, it’s a lot more efficient to plug in the USB installer drive. Download ‌macOS Catalina‌ from the Mac App Store Direct Link. Once the download is complete, close the installer window by selecting the Quit Install macOS option in the menu bar or using.

However, another fact is to make dual operating system on single machine. For example, you can run both macOS Mojave and Catalina. Because, the latest operating system is on beta version. Which means that it is not stable. Further, there are bugs and problem related to different software. Therefore, it is best practice to install beta operating system on different drive with USB Installer. Which gives you more freedom to test various application. Further, you have no fair to loose your time and energy to restore in case you find bugs.

Contents

Opt Flash Drive

Since, we are going to install macOS Catalina from Flash Drive. Therefore, you need USB Flash Drive. You must have minimum 8GB of storage of Flash Drive. However, if you are not out of budget. Then it is better idea to get more storage for USB drive. Because, you will get much more space, in case you are going to add more application or software.

For the purpose of these tutorial, i am using 16GB SanDisk. Which has two connect both for micro_USB for mobile and USB 3.0 for laptop and PC. Therefore, I recommend SanDisk 64GB Ultra Dual m3.0 USB 3.0.

The drives comes with minimum 8GB to 256GB. Therefore, you have varieties of option to select one. However, if you are thinking to get extra storage. Then it is best idea to get External Hard drive with 1TB. Where you can store more data without any restriction.

How to Create a Bootable macOS Catalina USB Installer Drive

Create a Bootable macOS Catalina USB Installer Drive

To create a a Bootable macOS Catalina 10.15 USB installer drive. Simply follow the steps below.

Step 1: Download macOS Catalina

First you have to download macOS Catalina. There are two version of macOS Catalina at the moment. The first one is macOS Catalina Developer Beta. You can download that from Apple’s Developer portal. Further, the second one is macOS Catalina public beta. Where you can easily download that from Apple Public beta Website.

However, I recommend, you should download macOS Catalina public beta.

Step 2: macOS Public Beta Access Utility

Once you have download the Public Beta. Then you have to open the dmg file. Then you will see a windows of macOS public beta access utility will appears. Therefore, you have to double-click on installer package.

Further, it will warn you about No Time Machine backup detected. However, it is best practice that when you are going to update. You must take backup of your machine.

Time Machine Backup

Step 3: Install macOS Public Beta Access Utility

In this step. I wizard will appear. Therefore, you don’t need to do much. However, I will simple guide you through this wizard as well. How you are going to deal with it.

1. First wizard page is about introduction. Therefore, you have to click on Continue.

2. Then it will take you to license. Therefore, you have to click on Continue. Then, to continue installing the software you must agree to the terms of the software license agreement. therefore, you have to click on Agree.

3. Now Click on Install on installation type.

4. Enter User name and password and click on Install Software.

Install macOS software

Step 4: Download macOS Catalina Updates

Similarly, you will see Software Update window. Therefore, you have click on update software. Since macOS Catalina is big size. However, it will take some time to download. Therefore, you should wait for the downloading to completes.

Step 5: Quite macOS Catalina Utility

After downloading will completes. You will see installer macOS Catalina Beta utility. However, you should not continue that utility. Because, we are not going to update operating system. But, we are going to make macOS Catalina USB Installer. Therefore, you have to close the window.

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Step 6: Open Terminal

Create Catalina Boot Usb

Now you have to Open Terminal. For that you simply follow the steps below.

1. Open Finder.

2. click on Applications.

3.Then you have to open Utilities folder.

Download Macos Catalina On Usb Pc Camera

4. Next you will see the Terminal. Therefore, you should open the Terminal.

Step 7: Write Terminal Commend

As you Terminal is open You have to write following commend.

Sudo /Applications/Install macOSCatalina Beta.appContentsResources/createinstallmedia –Volume /Volumes/

Then you have to open the Go Menu. click on Go to Folder. Then you have to click on /Volumes. Further, click on Go.

Next you have to plug your USB Drive. Then you will find the your USB Drive will appears on Volume Folder. Therefore, you have to drag that on Terminal. Next, you have to press Return on Keyboard.

Terminal Commend

Further, it will ask about password. Therefore, you have to enter password and press Return. Then it will ask if you wish to continue. Then you have to type Y and press return.

Finally, you have to wait for files to copy on USB Installer Drive.

Step 8. macOS Catalina USB Installer

Congratulation, you have successfully create a Bootable macOS Catalina USB Install Drive. Therefore, Now you have to unplug the USB. Then you are install macOS Catalina to any Mac machine which you want.

Step 9: install macOS Catalina USB Installer drive

Once your USB is ready. You have to take that USB and plug it to the Mac machine on which you want to install Catalina. Then you have to start MacBook. But, remember you have to hold down Option key. Then you will see the boot option.

macOS Boot

Now you have to select. macOS Catalina and continue to install it. The installation is simple. You have to follow the instruction on each wizard page. There will be no technical difficulties. Therefore, you will easily install it on your MacBook.

However, if you want to install macOS Catalina on VMware or You want to install macOS Catalina on VirtualBox. Then, it is better to test it on virtual machine.

conclusion: I hope you find this article useful. However, if you want to add your opinion or suggestion. You are most welcome to add in comment below. Thank you.

I purchased a used 2018 Mac mini desktop and wanted to put a fresh installation of the latest macOS 10.15 Catalina on it. Below are the steps I took.

Note: The instructions below are the same for macOS 10.13 High Sierra and macOS 10.14 Mojave.

Download macOS Catalina

You will need a Mac to download macOS Catalina. (The Mac mini came with macOS 10.14 Mojave so I used it to download Catalina.)

Go to the Mac App Store, search for “macOS Catalina”, and download it. It will be saved to the “/Applications/Install macOS Catalina” location. If the installer automatically launches, just close it.

Note: If you plan to run the installer first to update your current macOS version to Catalina, you will want to move the “Install macOS Catalina” application out of the “/Applications” directory; otherwise, the installer will delete itself from the “/Applications” directory when the upgrade completes. For example, you can move the “Install macOS Catalina” application to the “~/Downloads” directory and run it from there.

Format USB Flash Drive

Because macOS Catalina is 8.4GB in size, you will need a 16GB USB flash drive. You don’t need to delete the existing content on the drive because we will blow it all away in a subsequent step.

If the USB flash drive is not already formatted as “Mac OS Extended (Journaled)”, format it like so:

1. Plug the USB flash drive into your Mac.
2. Launch the “Disk Utility” application.
3. On the left-hand pane, select the USB drive (not the partition under it, if any).
4. Click on the “Erase” tab (or button at the top).
   1. Input a name like “Catalina” (this name will be overwritten later).
   2. Select “Mac OS Extended (Journaled)” for “Format”.
   3. If available, select “Master Boot Record” for “Scheme”.
   4. Click the “Erase” button at the bottom. Click the “Erase” button in the warning popup dialog if you get one.
5. The format operation may take several minutes to complete. (USB 2.0 and large capacity drives may take longer.) After the format completes, the partition will be mounted under “/Volumes/Catalina” (or whatever name you selected above).
6. Close the “Disk Utility” application.

Write macOS Catalina to USB Flash Drive

To create a bootable USB macOS Catalina installer, run the “Terminal” application and this command:

Note: If the createinstallmedia command returns a “Failed to start erase of disk due to error (-9999, 0)” error, then your current Mac OS X version does not fully support the createinstallmedia tool. Use a more recent macOS version (at least Mac OS X 10.11 El Capitan) or manually create the USB installation drive using instructions from Bootable USB Flash Drive to Install Mac OS X 10.10 Yosemite.

The “createinstallmedia” program will erase the USB flash drive, create a new partition named “Install macOS Catalina”, and copy the installation files to that partition. The output will look like:

The above process took 20-30 minutes using my Kingston USB 2.0 flash drive.

Boot From USB Flash Drive

Note: Apple’s How to create a bootable installer for macOS page suggest using the “Startup Disk” configuration (under “System Preferences”) to select the USB flash drive as the startup drive. Then on restart, the Mac should boot from the USB flash drive. Unfortunately, the “Startup Disk” did not list my USB flash drive as a startup option, so I was not able to use this method.

To boot a Mac with the USB flash drive:

1. Insert the USB flash drive.
2. While holding the “option” key down, turn on the Mac to display the Startup Manager.
3. You should see one or more icons, one of which should be called “Install macOS Catalina” for the USB flash drive. (The internal hard drive may not be visible if it does not have a valid, bootable partition installed.)
   • Note: If you don’t see the USB flash drive’s “Install macOS Catalina”, try removing and re-inserting the USB flash drive while viewing the Startup Manager screen. The USB flash drive should then appear after a few seconds.
4. Select the “Install macOS Catalina” (with left/right arrow keys) and hit the “return/enter” key to boot from the USB flash drive.

It may take 5-10 minutes to load the installer from the USB flash drive. Sometimes the progress bar may appear to be frozen or the screen will go black for a minute or two. Be patient.

External Startup Disk Not Allowed

On a newer Mac with the T2 security chip, booting from an external drive may be disallowed by default. Attempting to boot from a USB flash drive will result in a “Security settings do not allow this Mac to use an external startup disk” warning message.

To allow booting from the USB flash drive, do the following:

1. Hold down “Command-R” (hold down both the “Command ⌘” and “R” keys) when you start the Mac to launch macOS Recovery. You can release the keys when you see the Apple logo.
   • Tip: An easier alternative is to hold the “Option/Alt” key on boot to launch the Startup Manager. Then just click and release “Command-R” keys to launch macOS Recovery.
2. The macOS Recovery screen contains a top-level “macOS Utilities” menu.
3. Click on the “Utilities” menu and select “Startup Security Utility”. Input your administrator password when prompted.
4. In the Startup Security Utility, under “Allowed Boot Media”, select the “Allow booting from external or removable media” option.
5. If the Mac won’t have access to the Internet (either by wire or wirelessly) when installing macOS Catalina, make sure to select either the “Medium Security” or “No Security” option under the “Secure Boot” section. (You can change the option back to the default “Full Security” afterwards.)
6. Quit the macOS Utilities to restart the Mac.
7. On restart, follow the directions in the previous section to boot from the USB flash drive.

Erase the Internal Hard Drive

When the installer finishes loading, you will see a “macOS Utilities” screen appear. It looks the same as the “macOS Recovery” screen with one difference. In the “macOS Utilities” window, the second option will say “Install macOS” instead of “Reinstall macOS”. In “macOS Recovery”, the “Reinstall macOS” option would just re-install the same version of macOS. The “Install macoS” option will install the macOS Catalina version on the USB flash drive.

Before installing macOS, I wanted a clean slate so I erased the internal hard drive like so:

1. Select the “Disk Utility” option and click the “Continue” button on the bottom to launch the “Disk Utility” application.
2. On the left-hand pane, select the internal hard drive (not the partition under it, if any).
3. Click on the “Erase” button at the top.
   1. Keep the default “Macintosh HD” name or input a new one.
   2. Select “APFS” for “Format”.
   3. Click the “Erase” button at the bottom. The SSD (Solid State Drive) format took less than a minute to complete.
4. Close the “Disk Utility” application.

Install macOS Catalina

Warning: If your Mac has a T2 security chip and you left the “Full Security” option configured in the Startup Security Utility, make sure that Internet access (wired or wireless) is available before starting the macOS Catalina installation. You can configure the wireless network by clicking on the wireless icon at the top-right corner of the macOS Utilities screen.

Back at the “macOS Utilities” window, do the following to start the macOS Catalina installation:

Download Macos Catalina On Usb Flash Drive

1. Click on the “Install macOS” option and click the “Continue” button.
2. The “macOS Catalina” installer’s splash screen will appear. Click the “Continue” button.
3. Click on the “Agree” button to agree to the license. A popup confirmation window will appear; click on the popup’s “Agree” button.
4. Select the internal hard drive and click the “Install” button.

My Mac mini took 20-30 minutes to complete the macOS Catalina installation. I think there were a couple of reboots in-between. And a few times, the screen would go black for a minute or two. Be patient and give the process an hour or more to complete.

If you run into problems installing macOS Catalina, check the “What Does Giving Up Mean?” section (at the bottom) of Install macOS Sierra Using Bootable USB Flash Drive for possible solutions.

Note: macOS Catalina seems to have an issue with my Dell 24in U2410 monitor. During the initial bootup screen, the monitor shows a blank screen with a message, “The current input timing is not supported by the monitor display”. Thankfully, the monitor works correctly after the bootup completes. And later, this warning message no longer appeared on bootup.

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Enjoy your fresh installation of macOS 10.15 Catalina.