Clean For Sierra Mac Is Running

This is often a good option if your Mac is running slow or otherwise misbehaving.

If thats what youre looking for, it may be worth taking a look at another article where we focus on that entirely: How to download and install old versions of OS X on a Mac.

The traditional way was to make a bootable copy of the macOS installer on a Flash drive and then reformat your drive before installing the bootable copy on to your Mac.

We have a tutorial about doing a clean install of macOS using recovery here.

You will now find two volumes to delete: Macintosh HD-Data and Macintosh HD.

You could alternatively sync all your Documents and Desktop with iCloud rather than run a full backup, but make sure that everything you need is in the cloud and be aware that you may lose system setting and applications.

But before you do that you can prepare the USB drive by reformatting it.

Make sure its called Untitled - rename it if necessary (this will help you enter the correct text in Terminal in the next steps).

When you cut and paste the following text into Terminal do check that it maintains the -- as we have heard of people pasting in the -- and it converting to ) sudo ApplicationsInstall macOS Catalina.appContentsResourcescreateinstallmedia --volume VolumesUntitled.

The process can take a while, youll see Erasing Disk: 0 10 20 30100.

Copying installer files to disk Copy complete and so on will appear in the Terminal window.

If you want to do a clean install of Catalina over an existing installation of Catalina you will need to first delete the Macintosh HD - Data volume.

Clean For Sierra How To Do This

We cover how to do this in more detail here: How to reset and wipe a Mac.

Clean Mac For Sierra