If you want to run MacOS Catalina Beta with macOS Mojave or macOS High Sierra, you can do so by adding a new APFS volume to Mac if your Mac hard drive is formatted as APFS. This effectively creates a dual boot scenario for MacOS Catalina 10.15 and Mojave 10.14.x (or High Sierra), and offers an alternative approach to just installing MacOS Catalina Beta on a Mac as the primary operating system. There are some benefits to this approach, especially that you can use a single Mac to run the two operating systems, and you do not need to set Catalina storage capacity as it will share the drive location with the other MacOS release and expand as needed.
Important: This is for advanced Mac users only. There are mixed reports of problems with running MacOS Catalina along with other macOS releases, especially for Macs with T2 security chips and Touch ID. Make sure you have a full backup of your data and Mac before attempting this.
To get started, you need a full backup of Mac and all data on your computer, a Mac compatible with MacOS Catalina, you & # 39; You need to be registered in the MacOS Catalina beta test program and you need a minimum of 35 GB of free disk space available, but more recommended for best results when trying Catalina.
How to install MacOS Catalina in an APFS volume Next to MacOS Mojave / High Sierra
This will create a dual boot environment that lets you switch between MacOS Catalina and MacOS Mojave or High Sierra.
- Back up your Mac with Time Machine or the selected backup method, do not skip this step
- Open Disk Utility on Mac and create a new APFS volume by clicking the "+" plus button
- Name the new APFS volume something obvious as "Catalina" and click "Add" (optionally you can adjust the size options, but this is not necessary)
- Click "Done" and then quit Disk Utility when done
- Open the "Install MacOS Catalina Beta" application found in the / Applications folder (you can also use a MacOS Catalina USB boot drive if you have created one) and click " Continue "and then read and accept the terms of service
- Click" Show all disks "
- On the disk selection screen, select alternate t "Catalina" APFS Volume you created earlier as the target disk, then click "Install" to install MacOS Catalina Beta on that volume
- Allow entire MacOS The Catalina installation complete, the Mac will restart and the process will take some time to complete
When the installation completes and Mac restarts for the last time, the computer starts directly in MacOS Catalina.
How to switch up MacOS Catalina or MacOS Mojave / High Sierra
You can switch between starting and running MacOS Catalina and MacOS Mojave or High Sierra by doing one of the following:
Switching up MacOS version startup on the system Start
- Restart or restart your Mac and hold the OPTION key immediately and then select the macOS volume you want to boot from
. Turn off the MacOS version startup via System Preferences
- Pull down the Apple menu and go to "System Preferences" and then go to "Startup Disk" and select the volume / operating system to start from
Remove MacOS Catalina APFS Volume
If you want to remove MacOS Catalina Beta, you can simply open the Disk Use tool and delete the APFS volume that you created to install MacOS Catalina on.
Since you are not upgrading or installing MacOS Catalina over an existing MacOS release or as the sole operating system on your computer, the typical downgrade Catalina method is not required (unless you wanted to format and delete entire Macs and volumes, anyway).
Have you installed and run MacOS Catalina in an APFS volume? Did you use another method? Do you have any tips, advice, reports or experiences you would like to share? Share with us in the comments below!