You can run Mojave and Catalina on the Mac in a dual boot setup without repartitioning or reformatting your Mac’s storage. But thanks to APFS, the file formatting system that Apple made everywhere with Mojave’s release. It’s good if you need to use apps that won’t run on Catalina, but you still want to use what Catalina has to offer. Here’s how?
About APFS and HFS+
If your apps can’t be updated to run on macOS Catalina but you want to enjoy the new features of Catalina. One solution is to download Catalina on the same Mac as Mojave but in a different Volume. Using the way you can operate in Mojave with Mojave-compatible apps when you need to, then reboot into Catalina to get used to the new OS. You can do this because Mojave uses APFS, which makes it easier to reconfigure your hard disk or SSD.
APFS was first introduced to the Mac with the launch of macOS 10.13 High Sierra in 2017. The new file system is thoroughly optimized for modern hardware and specifications, with an eye towards solid-state storage like the SSDs. APFS replaces HFS+, which had been Mac’s file system since the “classic” Mac days built on an older protocol.
APFS supports logical drives called Volumes, which use the same storage container where free space is available. This is more efficient than the old method. But make sure to clear hard drive space if you want to before installing Mojave and Catalina together.
How to create a new Volume on a Mojave Mac
To create a Catalina volume on your Mac, follow these steps.
Firstly, double-click on Disk Utility in the Utility folder.
Choose your Mac hard drive from the sidebar.
Tap the + button above Volume.
Name your new APFS volume and tap Add. With the new Volume created, you’re on to installing Catalina.
How to install Catalina on a second Volume
Install the Catalina installer from the Mac App Store.
Double-click on the Catalina installer.
Tap Continue, click Agree and again tap Agree.
Tap on Show All Disks.
Choose the new Volume you just created. Then tap Install. Don’t select the Volume where Mojave is installed, until you want Catalina to overwrite Mojave.
The installation process will start. Follow the prompts to finish installing Catalina on your new Volume.
The installer will give you the choice of migrating data and applications from another Mac. If you want to bring over your data, settings, or even apps to see how they’ll work in Catalina, just choose the Volume where Mojave remains.
How to dual boot between Mojave and Catalina
After Catalina is installed, you can switch between Catalina and Mojave using the Startup Disk system preference. Here’s how:
Tap the Apple menu.
Then choose System Preferences.
Then tap the Startup Disk.
Now click the padlock icon in the lower-left corner of the window to unlock the settings. Input your system password and tap Unlock.
Choose the new Catalina volume and tap the Restart button. Your Mac will restart in whatever system you select.
For further queries and questions let us know in the comment section below!