Reverting to Mac OS Mojave after Catalina - About the Macintosh HD Data volume

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Reverting to Mac OS Mojave after Catalina - About the Macintosh HD Data volume

I realised after upgrading to Catalina that there were are couple of apps that I needed which were not supported by the new OS, and my Late 2013 iMac just does not have the internal hardware needed to keep things snappy. I created a bootable copy of the Mojave installer on a thumb drive, and then did a 'fresh' install using Disk Utility. I made the mistake of not selecting the entire internal drive to write over, and ended up with Mac OS Mojave, but retaining 'Macintosh HD' and the 'Macintosh HD Data' volumes.

Can someone please clarify for my how I can be sure to do the install again, but this time doing It as if Mojave was being installed on to my iMac at the factory?

Posted on Apr 11, 2020 9:12 PM

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Answer 1

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leroydouglas

Community+ 2024

Level 10

188,598 points

Apr 12, 2020 4:40 AM in response to GlobularFlark

Yes From Interent Recovery>Disk Utility>View>Show All Devices>

Here you need erase/reformat the parent drive, not the Container or child Volumes.

How to reinstall macOS from macOS Recovery - https://support.apple.com/en-us/HT204904

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Answer 2

Apr 13, 2020 1:43 AM in response to leroydouglas

Thanks for your reply. What I should have mentioned is that I have a Fusion Drive, but when I go to Disk Utility from Recovery Mode, I am not given the option to delete the entire drive, only the "Container disk2" and "Macintosh HD" volumes. The Fusion Drive shows in DU as an APFS Fusion Drive • GUID Partition Map. Do I need to reformat the entire Fusion Drive before I can go ahead and reinstall mac OS?

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Answer 3

HWTech

Level 9

60,422 points

Apr 13, 2020 7:02 PM in response to GlobularFlark

Then select the base of the Fusion Drive to erase.

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Reverting to Mac OS Mojave after Catalina - About the Macintosh HD Data volume

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