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I'm in the process of doing a clean install of catalina. I booted from my USB install disk and erased the startup volume. When I go to install Catalina I am given a choice of two startup volumes, one a mirror image of the other. I'm attaching photos of how this looks. I'm not sure how big an issue this is but before I proceed I'd like to understand what I am looking at. Thanks.
MacBook Pro Retina
I booted from my USB install disk and erased the startup volume.
It looks to be an incomplete initialization of the parent drive.
From your bootable installer> Disk Utility>View>Show All Devices> reformat the parent drive as GUID/apfs
and try again your install.
To keep the confusion down—let the installer rename the drive as it see fit. You should end up with:
Macintosh HD
Macintosh HD - Data
ex.
You can read more on the two volumes created after a successful Catalina installation.
I booted from my USB install disk and erased the startup volume.
It looks to be an incomplete initialization of the parent drive.
From your bootable installer> Disk Utility>View>Show All Devices> reformat the parent drive as GUID/apfs
and try again your install.
To keep the confusion down—let the installer rename the drive as it see fit. You should end up with:
Macintosh HD
Macintosh HD - Data
ex.
You can read more on the two volumes created after a successful Catalina installation.
Hi marby,
What you are seeing is normal behavior. In MacOS Catalina, Apple created a read only partition for the operating system which is sepporate from your files for security reasons. There is a second partition for your data, called Macintosh HD - Data or in your case MacBook 2014 - Data.
You can read more about it in the article about the read only partition in MacOS Catalina.
I hope this helps.
Many thanks.
Disk utility showing two volumes on ssd
