We have an article about how to securely erase your external drives if you want to check that out. If your flash drive is already visible to the Mac in Finder, then you don’t need to worry about erasing it. Do I need to erase my flash drive beforehand? Once you’ve got the installer of your choice downloaded from Apple onto your Mac and have a working flash drive, then plug your flash drive into your Mac. For now, we’re just going to show you one. Note you can put multiple installers on a single flash drive if the drive has enough space, they’ll just each take up a partition. Make sure you use the one supported for your machine. I’ve pasted the links below for 10.11 “El Capitan” to the latest OS 12 “Monterey” at the bottom of this article. A copy of the installer for the version of Mac OS you want to use.NOTE: this will be erased so make sure you don’t have anything on the flash drive before using it or that you’re ok with it being erased. I personally recommend the Sandisk Cruzer line of flash drives and is what I’ll be using for this tutorial. A USB flash drive with at least 16 gigs.You’re going to need a few things before you begin: The first method will be just using the Mac’s Terminal app with the other 2 options being with third-party applications.
So in this article, we’ll show you how to create a working Mac OS install onto a USB flash drive.
However, in the event something is amiss with your Mac, or if you’re in IT working with a number of Macs, it’s important to have tools that you can use to reinstall Mac OS. Macs are fairly reliable devices, and even have a built in recovery mode for you use in the event that something goes wrong.
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