How to Fix “APFS Disks May Not Be Used As Bootable…”

When creating a bootable installer for macOS, you might see the error message, “APFS disks may not be used as bootable install media.”In most cases, you need to format your disk using the Mac OS Extended (Journaled) file system, not APFS.

 

Follow below procedure;

 

Step 1: Open Disk Utility. You can find it in the Utilities folder in your Applications folder or use Spotlight to search for it.

Step 2: Select your disk in the sidebar of Disk Utility.

Step 3: Click the Erase button at the top-right of the window.

Step 4: Select Mac OS Extended (Journaled) in the Format drop-down menu.

Step 5: Partition your disk.

 

After your disk has been partitioned  you should be able to use it to create a bootable installer for macOS.