How to Clean Install macOS Big Sur/Catalina 10.15 on MacBook Pro/Air/iMac and Mac Mini

Last Updated on Jul 18, 2020

Performing clean install of macOS Bis Sur/Catalina on Mac/MacBook has many benefits and most of the users keep doing this. The only disadvantage of clean install macOS is, the hard drive of Mac is erased in this procedure along with customized settings. So if you want to keep your personal files, data, customized settings, and other data, then don’t perform a clean install, instead, simply update your macOS to the latest version. Clean install or Clean Restore people mostly like to fix all kind of serious issues and use MacOS like Normal.

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Important Note: Using these steps we can install latest public version of macOS on your MacBook, Mac. But, macOS Beta install on mac Users can clean install using Bootable Drive only [macOS Big Sur Beta to macOS Catalina].


Before performing a clean install of macOS Catalina on MacBook/Mac, you should keep the following points in mind.

Why Clean install macOS on MacBook/Mac?

When you clean install macOS Catalina on MacBook or Mac, it will remove all the data stored on the system and install the macOS. Ultimately, your Mac has fresh installed macOS or sort of new Mac with no customizations, third party applications, no user accounts, no-cache files or personal files, etc.

If your Mac performance is degraded and not working well, then you should not directly update the Mac. Rather clean install macOS, that will merely install the latest macOS Catalina on your system.

How to Clean Install macOS Catalina 10.15?

Note: Clean installing macOS Catalina 10.15 on Mac will erase all the stored data, so kindly take a backup of the system and then perform the following steps.

Step #1: Turn off your Mac. To do so, click on Apple Logo from the top mac menu > Shut Down.
Step #2: Press and hold Command + R key on the keyboard on the Mac.
Step #3: After a long wait, your Mac show up MacOS Utilities window.
Step #4: Select “Disk Utility” and hit continue button.
Step #5: Then we can take different types of activities like repair MacOS, Erase and Install, or Create an another partition to install seance MacOS or Beta Version of MacOS.
Step #6: Here first we remove or clean all the data from Drive and install New Supported MacOS from Apple Server.

Disk Utility on Mac to MacOS Catalina

Disk Utility on Mac to MacOS Catalina

Step #7: Choose Internal Hard Drive on the top-left side.
Step #8: Click “Erase” tab.

Erase Drive to Clean install MacOS Catalina

Erase Drive to Clean install MacOS Catalina

Step #9: Again Click “Partition” when the pop-up appears.
Step #10: Select the Format, “APFS” type or if you are using older Mac Drive then go for “macOS Extended Journaled”.

Step #11: Click “Erase”.
Step #12: After Erase complete, Close Windows and Now you are on MacOS Utilities windows. See below window on Mac Screen.

Erase Drive to Clean install MacOS Catalina

Erase Drive to Clean install MacOS Catalina

Step #13: Click on Reinstall MacOS option.
Step #14: Click “Continue” and “Agree”.
Step #15: Now, select the hard drive that you have created earlier and on which you are going to install macOS Catalina.
Step #16: Then, click “Install” and “Continue”.

It will take a while to complete the installation process.

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Step #17: By now, you Mac have been started, select the “Wi-Fi network” and “Continue”.
Step #18: One by one, you will be asked to set up the Mac-like choosing Country, Sign in with Apple ID and much more. Do it if you want to or else click “Set up later”/ “Skip”.
Step #19: Also you will be asked to Choose Your Look, select and “Continue”.

That’s It! Once you have completed the above steps, now all you need to do is, download the applications that are necessary, restore a backup, and customize settings to use your Mac smoothly.

Jaysukh Patel is the founder of howtoisolve. Also self Professional Developer, Techno lover mainly for iPhone, iPad, iPod Touch and iOS, Jaysukh is one of responsible person in his family. Contact On: [email protected] [OR] [email protected]

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