You should also consider using a fast flash drive. Going larger isn’t a bad idea, though you can use the extra space on the flash drive to store apps and utilities you may need for troubleshooting purposes. Future versions may require larger flash drives, but for now, 8 GB is big enough. The list of items needed to complete this project is fairly basic, and I suspect you may already have everything you need.Ī connection to the Internet: You’ll need an Internet connection for downloading the installer from Apple.Ī USB flash drive: 8 GB is the minimum size required, at least for all the versions of the macOS through macOS Catalina. What You Need to Create a Bootable MacOS Installer
#Bootable mac usb image mac os#
This can usually be done provided you have a copy of the installer for the version of the Mac OS you wish to return to. You may have noticed that with each new version of the macOS that’s released, there are usually some users who have one or more issues with it and wish to return to a previous version.
#Bootable mac usb image install#
It lets you install the OS on multiple Macs without having to download the installer multiple times.By booting to the installer, you can perform a full erasure of your normal startup device before installing the new OS. It allows you to perform a clean install of the operating system on your Mac using the existing startup drive.There are multiple reasons for having a bootable macOS Catalina installer.
Why Make a Bootable macOS Catalina Installer? Macs with Thunderbolt 3 can also use a USB flash drive as bootable media (an adapter may be required).
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