Let’s compare macOS Catalina with macOS High Sierra. You get all the improvements that Mojave users get, plus all the benefits of upgrading from High Sierra to Mojave. But what if you’re still running macOS High Sierra? Well, the news then it is even better. Most coverage of macOS Catalina focuses on the improvements since Mojave, its immediate predecessor. But to help you do it all by yourself, we’ve gathered our best ideas and solutions below.
So, simply erase and format - you can find instructions in the Help section (menu bar) in Disk Utility.So here's a tip for you: Download CleanMyMac to quickly solve some of the issues mentioned in this article. It also seems easier to format an external drive rather than creating a partition on the internal drive - remember that you do not need any software or drivers on that drive. You can find instructions for creating clones on the CCC website - it is really quite easy to do. You can boot into it and try it and you can boot back into your regular system any time. That way, you'll have exactly what you'd have on your regular drive.
Once you have the clone done, boot into it and download/install the upgrade. If it's external, make sure you format it Mac OS Extended (Journaled) and GUID Partition Scheme so it's bootable (you do that in Disk Utility in Applications > Utilities.Īfter you create your partition, you can either download Sierra and simply direct the installer to install it on that drive (rather than your regular hard drive) or, if you want an exact copy of your system to install the upgrade on, then you can use either CarbonCop圜loner or SuperDuper to clone your current system to the new partition or external drive. In order to do that, you will need to either create a partition on your internal drive or get an external hard drive.
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