![]() ![]() It’s very useful to also have copies of all of your license information for Mac apps, since those that require a license or activation will need to be set up after your clean install. In addition, be sure that you know all of your online account passwords and logins - for this, a password manager like 1Password can be very useful. Make sure that you have access to all installation media for your apps (developer websites, Mac App Store, DVD or CD), and it’s a good idea to make a Note of all apps that you wish to re-install. Clean installs are also useful if a software or system software update has somehow trashed your existing operating system or if you have replaced a hard drive.īe sure you have plenty of time available to complete the complete install, as it can sometimes take as much as a day to go through all the steps.Īs noted, we’re going to completely erase everything on the Mac. 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. You can format the drive and then go back to the Recovery menu and install macOS Monterey.Sometimes it’s a good idea to do a clean install of a new Mac operating system version. If you want to erase your disk first, to do a clean install, quit the installer and run Disk Utility from the Recovery menu. After selecting it, your system will boot off your USB drive and enter macOS Recovery with the macOS Monterey installer appearing on your screen. You should now see an option to select your USB drive as a startup disk. To boot an M1 or M2 Apple silicon Mac using a bootable USB disk, power on the system or restart it if it’s already on, and keep the Power button pressed down. Power on the system, or restart it if it’s already on, and immediately press and hold the Option key when it starts booting. ![]() Simply plug your created USB drive into an open USB port on your Mac. There are two different methods to boot your Mac from a bootable USB, depending on which processor your Mac has. You can use Time Machine to easily back up the data on your Mac. This almost always results in a Mac running faster after a clean install, since macOS has started over with a clean slate.īefore you reinstall macOS on your Mac, make sure you’ve backed up all your important data! This is crucial when you do a fresh installation, as it will wipe your hard drive. A clean installation allows you to get rid of junk apps and files that may have accumulated over time. These issues include when your Mac refuses to boot or when you need to recover system files that seem to be lost.Īnother benefit of using a bootable disk for a macOS installation is that you can perform a clean installation. You can also use the built-in recovery tools that come with the macOS installer to troubleshoot and fix different kinds of issues. This can save quite a bit of time, considering the most recent versions of macOS have an installer size of 12GB. Why Would You Need to Install macOS From a USB?Ĭreating a bootable USB drive and using it to reinstall macOS is a bit of a lengthier process compared to simply updating macOS from the Software Update section of the System Preferences, but it has its benefits.īut creating a bootable USB disk allows you to install or update macOS on multiple systems without having to download the installer on each Mac.
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