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Oct 10, 2019 This article guides you through the process of performing a clean installation of macOS 10.15 Catalina using the bootable USB drive method, rather than upgrading your Mac using Apple's standard. I have a Mac mini (2014) model and yesterday I bought a Samsung T5 meaning to install Catalina on it and run macOS over USB. I 'restored' the SSD through Disk Utility and the first time I booted from the Disk Manager it worked fine. Everything worked, had all my files and applications. After a reboot I can't get it to boot from the SSD. Just because ISO is not a native format for macOS computers, that doesn't mean there are no tools to get the job done on a Mac. In fact, we've showcased the best two methods to create Windows 10 bootable USB media on macOS Catalina, the latest version of the Mac operating system for iMacs, MacBook Pro and other desktop-based devices.
Disk clone software for macOS Catalina is the reliable tool which can help you clone hard disk drive in macOS Catalina. Here, we offer AweClone for Mac, one of the best disk clone software for macOS Catalina. It can help you clone HDD, SSD, USB drive, memory card, macOS Catalina system, etc after upgrading to macOS Catalina.
Easy way to Clean Install mac OS Catalina
macOS Catalina is Apple’s shiny new operating system for the Mac and it’s got a ton of great features and improvements. You’re probably keen to get started and install it straight away. Before you do, consider whether you want to install it over the top of your current OS, or as a completely clean install of macOS Catalina. The benefits of the latter are that it will be like a completely new Mac, with all your settings wiped out, and junk files gone. It should make your Mac run faster. The rest of this article will explain how to clean install macOS Catalina.
Before the clean installation of macOS 10.15 Catalina it’s recommended that you first delete junk and dusty files from the current macOS. There are many free and paid tools to clean junk but the quickest option is to run CleanMyMac X. You can expect to free up tens of gigabytes of space, including old apps, and their leftovers.
Here’s how it works.
Backup your Mac
I can’t stress how important this is. You must backup your Mac before you do anything else. You’re going to be erasing your startup drive completely, so you need a complete backup of everything. You can use Time Machine, another backup app, or a cloning tool. Just make sure you have a complete, preferably bootable, copy of your current installation.
You should also make notes of settings for apps you use regularly – screen grabbing them is a good way to do that. And you should make sure you have a copy of any licence codes that you’ll need when you reinstall applications. You can use Apple’s Notes app to make notes, as long as you sync them with iCloud.
Create a bootable installer of macOS Catalina
If you’re reading this after Catalina ships, you can download it from the Mac App Store and then choose Quit when the installation starts. If you’re clean installing the beta (and, by the way, that’s not something I would recommend. It’s much better to create a dual boot system when you run the beta.
Once you see ‘Done’ in Terminal you can quit it. Your USB stick or external hard drive is now a bootable Catalina installer, so keep it safe. Now, it’s time to clean install macOS Catalina.
How to Clean install macOS Catalina![]()
Now you've made a backup and created a bootable installer, it's time to actually install the new macOS. Follow these easy steps to clean install macOS Catalina on your Mac.
Once you’ve set up your Mac, you can eject the installer disk and remove it. Remember to keep it safe. You can now restore files you backed up earlier from Time Machine or whichever backup tool you used. Remember to restore files and folders individually, don’t, for example, restore your entire user directory otherwise you’ll copy back all the junk files you just got rid of. Reinstall applications and go through them adding license details where necessary. Check that everything works as you expect it to and use the screen shots you made earlier to configure settings.
There are lots of good reasons why you might want to clean install macOS Catalina, but the most important one is that it should make your Mac feel like new and keep it running smoothly. For ultimate Mac refresh you can also download CleanMyMac X and play with its cleanup tools. Getting rid of old junk feels great.
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In Disk Utility on Mac, you can erase and reformat storage devices to use with your Mac. Erasing a storage device deletes everything on it.
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Note: With a solid-state drive (SSD), secure erase options are not available in Disk Utility. For more security, consider turning on FileVault encryption when you start using your SSD drive.
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See alsoApple Support article: How to erase a disk for MacPartition a physical disk in Disk Utility on MacFile system formats available in Disk Utility on MacFormat a disk for Windows computers in Disk Utility on MacEncrypt and protect a storage device with a password in Disk Utility on Mac
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