In many cases, a clean install can improve the performance of a sluggish Mac.

The idea behind a clean install is to start with a completely bare machine, getting rid of any old data, files, preferences, settings, old drivers, apps you no longer use, and so on. In this post, we’ll describe how to do a clean install of macOS 10.13 High Sierra.īefore we get started, make a decision as to whether you want to do a regular update or a clean install, because a regular update is much easier to perform than a clean install. What’s a clean install? That means that the hard drive is erased completely and reformatted, which removes not only the current Mac operating system but all data, files, applications, you name it… Just think of it as a brand new computer having the operating system installed on it for the first time.

Sometimes it’s a good idea to do a clean install of a new Mac operating system version.