Formatting a disk
How do you upgrade your Mac by formatting its startup disk?
iMac Line (2012 and Later)
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How do you upgrade your Mac by formatting its startup disk?
iMac Line (2012 and Later)
Normally you don't format a disk just to upgrade. If you want to do a clean install that's different. You could create a USB Bootable Installer to boot ffrom and install to your newly formatted drive…
How to create a bootable installer for macOS - Apple Support
Or you could install using Internet Recovery.
Make sure you have a Time Machine or other backup before you do anything.
Normally you don't format a disk just to upgrade. If you want to do a clean install that's different. You could create a USB Bootable Installer to boot ffrom and install to your newly formatted drive…
How to create a bootable installer for macOS - Apple Support
Or you could install using Internet Recovery.
Make sure you have a Time Machine or other backup before you do anything.
Formatting a disk