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chi196 Author

Level 1

4 points

I just formatted my macOS big to install Catalina. At the point of APFS format, I don’t know which one to chose

How to boot my MacBook Pro from usb flash to install Catalina

Posted on Jan 28, 2021 1:53 PM

Top-ranking reply

HWTech

Level 9

59,960 points

Posted on Jan 28, 2021 10:02 PM

Personally I would click on "View" within Disk Utility and select "Show All Devices" so that the physical drive appears on the left pane of Disk Utility. Then erase the physical drive as GUID partition and APFS (top option), then quit Disk Utility and select "Install macOS". Here is an Apple article showing how to reveal the physical drive and erase it:

https://support.apple.com/guide/disk-utility/erase-and-reformat-a-storage-device-dskutl14079/mac

This assumes that your Mac is capable of running Catalina and did not ship from the factory with Big Sur.

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I just formatted my macOS big to install Catalina. At the point of APFS format, I don’t know which one to chose

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