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Installing macOS on a separate APFS volume

I followed all instructions in this article. When the original OS (Mountain Lion, in my case) was ready to install through Recovery, I was asked to choose which disk to install to, but there was nothing clickable on the screen, and no way to select the disk.


Any ideas?

MacBook Air 11", macOS 10.15

Posted on Apr 18, 2020 5:12 AM

Reply
5 replies

Apr 18, 2020 11:01 AM in response to MarkVT2

The only reasons to reformat HFS+ Journaled:


  1. you may use target disk mode to link to a prior to High Sierra machine or boot off a prior to High Sierra hard drive to recover information.
  2. You are installing an operating system prior to high Sierra and want to be able to see the contests of the partition it is on.


Note: APFS is automatic on Solid State drives with High Sierra and later. Meaning you will need to use the Option key Startup Manager if you plan to use an older operating system to dual boot from on SSDs.


Apr 18, 2020 6:43 AM in response to Niel

I am running Catalina now. I created a new APFS volume (as instructed in the article), with plans to use it for High Sierra, to enable me to run an older app that does not support Catalina.


Recovery only provides options for installation of a beta, or of the existing OS (Catalina, in my case), or the original OS (Mountain Lion for me). I chose the original OS.


After I accept the license agreement for Mountain Lion, is asks me to select a disk, but no options are provided. The only thing I can click on is the "back" button.


Do I still need to reformat the disk that I created to Mac OS Extended (Journaled)?


Thank you!

Installing macOS on a separate APFS volume

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