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Apple Computing Products:
macOS - Operating System
Downgrading from Catalina to older os.
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<blockquote data-quote="techiesteve" data-source="post: 1836331" data-attributes="member: 98520"><p>Catalina would have split the drive into 2 volumes, and this can't be resolved with disk utility.</p><p></p><p>You have to use terminal to create a single volume before installing Mojave as follows.</p><p></p><p>Launch the Terminal app, type the following command at the prompt to locate the Physical Store identifier of the APFS partition, and press Return:</p><p></p><p>diskutil list</p><p></p><p>When ready to delete the partition, type the following command:</p><p></p><p>diskutil apfs deleteContainer /dev/Substitute the Physical Store identifier of the APFS partition</p><p></p><p>You can then install Mojave. I have had to do this quite a few times now for customers who regretted upgrading to Catalina</p></blockquote><p></p>
[QUOTE="techiesteve, post: 1836331, member: 98520"] Catalina would have split the drive into 2 volumes, and this can't be resolved with disk utility. You have to use terminal to create a single volume before installing Mojave as follows. Launch the Terminal app, type the following command at the prompt to locate the Physical Store identifier of the APFS partition, and press Return: diskutil list When ready to delete the partition, type the following command: diskutil apfs deleteContainer /dev/Substitute the Physical Store identifier of the APFS partition You can then install Mojave. I have had to do this quite a few times now for customers who regretted upgrading to Catalina [/QUOTE]
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Apple Computing Products:
macOS - Operating System
Downgrading from Catalina to older os.
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