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Performing a clean install can also remove annoying quirks and strange behaviors that your Mac may have inherited over time, and often helps to reclaim disk space caused by junk files left by third-party apps. Also, be sure to perform a full backup of your Mac beforehand using Time Machine, so that you can restore your original system from the Recovery partition if something goes wrong.
At the Terminal command prompt, type sudo followed by a space. Next, open a Finder window, navigate to your Applications folder, right-click or Ctrl-click on the macOS Drag the createinstallmedia file into the Terminal window. Enter your administrator password when prompted. This will take a few minutes to complete, so leave it running until you see the message "Install media now available. When your Mac's startup disk is formatted, return to the Utilities window and select Install macOS , choose your freshly erased startup drive when asked where to install the OS, and follow the onscreen prompts to complete the installation.
To install Catalina on another Mac, first make sure it's powered off, then simply plug in the USB installer you created and turn the Mac on.
Thanks to Angus for the new Terminal command! Related Roundup: macOS Catalina.
Top Rated Comments View all. The Weatherman. I am not sure the process in the article works with any of the T2 security chip Macs. My MacBook Pro among them On those units, the T2 controls the ability to boot from an external drive.enter site
Command R not working! How to reinstall MacOS if Recovery won't work
To be able to boot off the external drive you have to authenticate as an administrator. That step was left out of the instructions. One more thing, if you erase the main drive and then reboot with a T2 Mac you will have to authenticate as an administrator as I already mentioned to boot off the USB drive, but the Mac looks at the boot drive for administrators that you can log into the security menu to boot from the external drive. Erased boot drive so no known administrators, so no way to boot off the USB drive.
Only a small amount of panic at this point What I ended up having to do was the Internet Recovery method, which is how I know it will only allow you to install the last installed OS. Then I installed Catalina over that fresh install of Mojave. Then booted from the USB drive again, formatted the drive again, rebooted and used internet recovery to install the last installed version of the OS which now was Catalina. I am sure there is a more elegant way to accomplish this same thing when a T2 chip is involved. Hopefully someone will write about it after they do it.
How to Reset Mac to Factory Settings
Command-option-r will load the latest OS compatible with the Mac. It does take a little while for Apple to update the recovery image after release, but it is working now.
Yes it will. You can always back-up keychain if you want to. Then from the Restore tab, restore your. For older versions of OS X You will need the OS X install disk image see above for various methods on how to obtain one , then use the day free trial of TransMac to copy the disk image to your USB drive. The right-side panel of TransMac allows you to right click your USB drive, the format the disk with the disk image.
Point it to your. MacDrive , which offers a 5-day trial, probably does the same, but I haven't been able to verify this yet. Home Questions Tags Users Unanswered. Asked 7 years, 1 month ago. Active 4 years, 7 months ago. Viewed 47k times.
Clean Install macOS Catalina Without USB Using Internet Recovery
If you don't have access to another computer: Try and get Internet Recovery to work. Ars Technica has an in-depth guide on how to do that: How to create a bootable, backup Mountain Lion install disk Not feeling like hacking? If you only have access to a Windows PC: You will need the OS X install disk image see above for various methods on how to obtain one , then use the day free trial of TransMac to copy the disk image to your USB drive. OS X licensing does not differentiate between owners of a version — you can't trace that.
Recovers documents, emails, images, videos, audio files, and more