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This will be the clean macOS install onto the freshly erased hard drive.

How to clean install macOS Mojave on a startup disk drive

Let the macOS High Sierra installation complete. When it is finished, the Mac will reboot and go through the standard setup procedure as if the computer was brand new. Enter your Apple ID, user account creation information, setup iCloud, and when complete with the setup you will be on a completely fresh and clean installation of macOS High Sierra.

Learn how to clean install macOS Mojave

Now the fun part… you get to manually restore your important files, data, and reinstall apps that you want on the clean macOS High Sierra installation. Most users who opt for clean installs will just copy files over directly from an external drive or cloud drive service, but you can do whatever method you want. As for reinstalling your apps, you will likely be downloading many of them from the Mac App Store, downloading them again from the developers, and perhaps restoring others from your manual file backup made in the first step.

File and app restoration can take a while. Some users may be wondering what the point of a clean install of macOS is. The main objective is usually to start fresh, without any accumulation of old and outdated data, any prior data, files, settings, preferences, unwanted apps, or holdovers from ancient updates or long gone software. Sometimes a clean install can offer the best performance for a Mac, and thus some users will perform a clean install for performance reasons.

Much like when you buy a brand new Mac it feels quite fast, a clean install can offer a similar feeling sometimes. Rarely, a clean install is necessary to overcome some dramatic software update failure or colossal mishap during a system software update like an interrupted installation or a corrupted hard drive.

This is pretty unusual but it can theoretically happen with situations like a power outage during a system software update, or a user erroneously removing critical system files or components, or similar catastrophic errors involving the core macOS system software. The main reason to not perform a clean install is the potential for a hassle.

It is infinitely easier to use the normal macOS High Sierra download and installation process , and that approach is best for the vast majority of users.

Do you have any tips, tricks, commentary, or experiences with a clean install of macOS High Sierra? Let us know in the comments below!

Enjoy this tip? Subscribe to the OSXDaily newsletter to get more of our great Apple tips, tricks, and important news delivered to your inbox! Enter your email address below:. Using macbook pro so the USB is connected via dongle. Please help!

How to clean install macOS

The createinstallmedia sometimes seems to not quite pull that off… for full Mac GUID boot… if the USB flash drive was originally for Windows and not Mac format, that is probably the reason. Good morning, many thanks for this aricle, and to those who add and share experiences. The HDD has already been upgraded to It has been OS upgraded from the original buy. So I was installing H.

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Hi Im upgrading from Yosemite. I downloaded the full 5Gb plus file but then I ran the code I got this error:. And now I cant access the flash drive which is 2 day old so it is not broken.. I cant even format it. Any ideas?

How to clean install macOS Mojave

After having tried any and all of the re-installation pre-checks and method your article suggested, without any success, after backing up and cloning my HDD, I was about to erase it all, to perform a fresh install reformatting and therefore fully erasing the original HDD.

It worked! In the additional new partition I was able to re-install Mac OS High Sierra, once done the installer utility asked me if I wanted to migrate data and from where, by selecting the original HDD as a source, the assistant calculated size and time and successfully migrated everything. Once done I fully erased the original HDD partition and regained free space. They say at Apple Support pages to update TimeMachine is the worst backup option if you are going to upgrade your system. This article says nothing about the new file system which is the main reason to upgrade.

On boot screen — selected my Wifi connection. I have been staring at this for 20 minutes and nothing has happened. Here is an article detailing how to download a full complete macOS High Sierra installer, it is linked from the USB flash drive article.

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  • How to delete the recovery partition from the previous system before via terminal to perform a TRUE clean install? When I wiped the drive on my 5k iMac, it split the fusion drive. Now have a 1tb hard drive and a gb ssd. Everything worked until I tried to restore from Time Machine backup when the backup drive had a yellow warning triangle. Name required. Mail will not be published required.

    All Rights Reserved. Reproduction without explicit permission is prohibited. Miguel says:. September 30, at am. Performing a clean install clears your Mac from all of the junk files that have accumulated as you've used it. If you're loathe to delete a couple of apps you're not quite ready to get rid of, you'll find it easier to identify which ones you do need when it comes to reinstalling them.

    Old files take up space and slow down your Mac, and most of the time you won't even know they're there. The only downside is that you have to reinstall your personal files on the new macOS, but if you've backed up your files this shouldn't be a problem — especially when you consider the benefits of a clean install.

    Part 2: Copy

    Here's a complete guide on how to have a fresh start with macOS Mojave. Just follow these 6 easy steps:. First of all, check that your Mac is compatible with the new upgrade. You need a backup of every important file that you'll want to reinstall on your new system. But there's no point in running a straight clone of your previous files: You'll just end up with the same junk floating around your new operating system. It doesn't particularly matter where you save the files you want to keep, as long as you're certain you have a backup.

    Once your Mac has been formatted, there's no getting those files back. Copy them over to at least one other location preferably two, just in case , which may be physical hard drives or Cloud computing. If you have a lot of files, or large files like movies, be aware that you may need more than one type of storage — iCloud only comes with 5GB free, for example, so you may need to pay for more or split your files between iCloud and OneDrive.

    A fresh macOS needs a fresh drive to run at peak performance. There are tons of redundant files on any computer, like old downloads, apps you never used, hidden cache files etc. Usually, these files keep migrating from one macOS to another slowing your Mac down. Now is, probably, the best moment to sort through old garbage, before you move on for the new OS.

    For major hard drive cleanup, I recommend using CleanMyMac , which I have been using for a few years now. The developer states that during the full scan with CleanMyMac, on average users find about 74 GB of potential junk to remove. I couldn't reach that amount but still the results were pretty solid.

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    • How to Perform a Clean Install of MacOS High Sierra?
    • BTW, the free version of this app can be downloaded here. Although your files are saved, don't wipe your system until you've downloaded macOS Mojave ready to use — otherwise you just have an empty Mac.


      If you've definitely saved the files you need and securely transferred them to an external location, then it's time to format your drive ready for macOS Mojave. Now you've got your file backup, a blank system, and the latest macOS on a USB drive, it's time to bring them all together. You now have a clean install of macOS Mojave to explore on your Mac.

      Get to know your new and improved OS, and don't forget to download your files from your external storage. Keep in mind that not all app developers have managed to update their apps for