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Rowe1772 Author

Level 1

8 points

Mojave to Catalina

I'm trying to update my MacBook Air with Catalina, but because my internal hard drive is not APFS, it won't load. I've already backed up my computer to an external drive and the cloud. I tried going in to Disk Utility to unmount and install, but Unmount was greyed out. Any suggestions???

MacBook Air

Posted on Jul 8, 2020 7:14 PM

Top-ranking reply

Kappy

Level 10

361,849 points

Posted on Jul 8, 2020 8:18 PM

This should help you but you will have to restore your files afterwards.

Internet/Network Recovery of El Capitan or Later on a Clean Disk

If possible, back up your files before proceeding.

Restart the computer. Immediately, at or before the chime, hold down the (Command-Option-R) keys until a globe appears.
The Utility Menu will appear in from 5-20 minutes. Be patient.
Select Disk Utility and click on the Continue button.
When Disk Utility loads select the target drive (out-dented entry w/type and size) from the side list.
Click on the Erase button in Disk Utility's toolbar. A panel will drop down.
Set the partition scheme to GUID.
Set the Format type to APFS (SSDs, only if installing Mojave or Catalina ) or Mac OS Extended, (Journaled.)
Provide a volume name, usually "Macintosh HD."
Click on the Apply button, then click on the Done button when it activates.
Quit Disk Utility and return to the Utility Menu.
Select Install OS X and click on the Continue button.

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Mojave to Catalina

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