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Archive for September 25th, 2018

by Tom Nelson

When you’re ready to install macOS Mojave, you’ll need to choose between two different install methods. The default is an upgrade install, which will update the version of the Mac operating system currently on your startup drive to macOS Mojave, while retaining your user data, apps, and other assorted information you may have stored on your Mac.

The second option is a clean install. This method completely erases all of the data on the startup volume and replaces it with the macOS Mojave operating system. When the clean install is complete, you’ll have a pristine startup drive, reminiscent of when you first got your Mac.

We’re going to show you both install methods, although we’ve combined them, since most of the steps are the same.

Preparing for Mojave
Before you begin installing Mojave, there are a few things to do to ensure your Mac and you are ready for the new operating system. Start by reviewing these guides to make the process an easy one: Mac 101: How to Get Ready for macOS Mojave

And while it’s unlikely you’ll encounter any problems while installing, this Rocket Yard Guide may help you solve a problem, should one occur: Mac Installation Errors You May Encounter and How to Fix Them

The App Store
The macOS Mojave installer is available from the App Store. You can find instructions for downloading the installer, as well as information about which Macs are able to run Mojave, plus some tips on common problems and how to avoid them, in the Rocket Yard Guide: How to Download macOS Mojave and Avoid Common Problems

The above guide also contains information on creating a bootable macOS Mojave installer. You’ll need the bootable installer if you intend to perform a clean install on the startup disk. You won’t need a bootable installer if you’ll be performing a clean install on a non-startup disk.

Even if you don’t need the bootable installer, it’s a good idea to create one, as a way to archive the installer as well as to make installing macOS Mojave on multiple Macs an easier process.

At this point, you’ve acquired the macOS Mojave installer from the App Store, and are almost ready to perform a clean or upgrade install. Before you proceed, be sure you have an up-to-date backup of your Mac.

If you’re ready to begin the install, I’ve broken the process into two sections: an Upgrade Install and a Clean Install.

Clean Install Preparation
Performing a clean install on your startup disk requires a few extra steps, including starting up from the bootable installer you made earlier, and completely erasing your startup drive. It goes without saying, but I’m going to say it anyway:

WarningThis process will completely erase your startup drive, causing all data stored on the disk to be lost.

Insert the USB bootable flash drive you made earlier into your Mac, and make sure it successfully mounts.

Restart the Mac while holding down the Option key. Keep the Option key depressed until you see the boot manager appear, displaying icons for all the disks you can start up from.

Select the USB bootable flash drive from the icons, and then press the return key on the keyboard.

When performing a clean install, use the Disk Utility option to erase the startup drive, and the Install macOS item to install Mojave on the empty startup drive. Screen shot © Coyote Moon, Inc.

Your Mac will start from the bootable installer. The startup process can take a bit longer than usual, depending on how fast the USB device is. Eventually, you’ll see the macOS Utilities screen.

Select the Disk Utility option, then click or tap the Continue button.

Disk Utility will launch. Make sure you select the correct volume in the sidebar. If you’re performing a clean install, the usual name for the startup disk is Macintosh HD, though it may be different if you’ve customized the startup drive name, or are performing a clean install on a different volume. You can use the instructions in How to Use macOS Sierra Disk Utility to Partition, Erase Drives for erasing a drive.

Using Disk Utility to erase a macOS High Sierra startup drive in preparation for a clean install of Mojave. Screen shot © Coyote Moon, Inc.

When you’re finished with Disk Utility, select Quit Disk Utility from the Disk Utility window.

From the macOS Utility screen, select Install macOS, then click or tap the Continue button.

From here until the system setup process, the installer for upgrade or clean works the same.

Read more on Rocket Yard, The MacSales.com Blog

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