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Plug the USB key into your Mac, then launch Disk Utility. Step 2: Make a bootable USB key containing the macOS Catalina installer 2a: Format the USB key You’re going to erase the key in the next step. If the USB key contains files that you want to keep, back them up. Don’t use a USB key that you got as conference swag - it may have the space, but more often than not, they tend to be slow, because they’re cheap. Doing so will greatly speed up the process. I strongly recommend that you use a USB 3 key, especially one with read speeds of 300 megabits/second or better, such as the Samsung Fit Plus. Because digital storage is all about powers of 2, the next size up will be 16 GB.

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The process will involve booting your Mac from a USB key containing the macOS Catalina installer, so you’ll need a key with enough space.

I’ve been at Auth0 less than a month, and between onboarding and offsites, there just hasn’t been that much of a chance for me to accumulate that many files on my hard drive!ġc: Get a nice fast USB key that stores at least 16 GB.

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All my work product is either code (which lives on GitHub) or content (which lives on GitHub or Google Docs), and.

I didn’t have to worry about this, since: If you have any files that you can’t live without, this is the time to back them up. In the process of reinstalling Catalina, you’ll need to completely erase your Mac’s hard drive. Apple’s servers will be busier than usual, as many users are downloading Big Sur and other upgrades.

The installer will take some time to download. Once it’s completely downloaded from the App Store, the installer will start automatically. It’ll take up around 9 gigabytes of space on your hard drive, and the App Store will put in your Applications folder. Here’s the link to the Catalina installer on the App Store. The first thing you’ll need is the macOS Catalina installer. Step 1: The preliminaries 1a: Start downloading the Catalina installer from the App store You’ll need a USB key and the better part of an afternoon. If you want to keep DJing, producing, or mixing on your Mac, stay on Catalina for a little bit.įor the benefit of any who need to downgrade, here’s a step-by-step guide to reinstalling Catalina after you’ve installed Big Sur.

If you’re a DJ or music producer, Big Sur currently has compatibility problems with some of the hardware and software.

This isn’t a problem if you’re keeping your old 2013 / 2014 machine around as a backup, but more serious if you’re still using it as your main computer (and yes, a 2013 / 2014 Mac is still a perfectly good machine, even for development work).

There are reports that the current version can “brick” MacBook Pros from the 2013 / 2014 era.

If you can’t afford to lose time dealing with these issues, you should wait for the updates.

It’s still very new, and very new versions of operating systems always have some set of issues, whose effects can run the gamut from mildly annoying to catastrophic.

There are other reasons why you might need to go back to Catalina after installing Big Sur:

They very quickly (and I should add, nicely) contacted me and let me know that I needed to reinstall macOS Catalina as soon as possible.

In my excitement to take the new version of macOS - Big Sur - out for a spin, I’d forgotten that the Security team hasn’t yet approved it for use.

Naturally, there’s a full-fledged security team that monitors company-issued computers.

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I now work at Auth0, a company with a headcount that’s quickly approaching 800, with unicorn status and Series F funding, and it’s in the security industry.

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I’ll admit it: I’ve gotten a little used to working at smaller companies, where there’s no monitoring of company computers, and it’s the Wild West as far as what you can install on them.