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freshleaf5985 Author

Level 2

304 points

Formatting a disk

How do you upgrade your Mac by formatting its startup disk?

iMac Line (2012 and Later)

Posted on Dec 29, 2019 3:17 AM

Top-ranking reply

dialabrain

Level 10

125,465 points

Posted on Dec 29, 2019 3:44 AM

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.

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Formatting a disk

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