Jul 12, 2021 This article shows you two ways to boot Mac from external USB stick, as well as some troubleshooting tips in case Mac won't boot from the target USB. Boot Mac from USB Option l: Startup Manager. If your Mac won't boot up normally, you can set it to boot from a different drive, such as a USB stick containing macOS installation files in bootable. Windows generally cannot be installed onto a USB drive due to the way it handles USB devices on startup. However, Windows XP can be installed on a USB drive with some hacking. It's a little involved. I assume the drive would appear as a standard Bootcamp drive (and boot properly) after this process, but I've never tried. MacBook Air (2010 or newer) MacBook (Late 2009 or newer) Mac mini (2010 or newer). I don't know why everyone always suggests the USB install disk method to clean install a new OS. Step 1: Ensure the bootable USB flash drive is plugged into your Mac and restart the computer. As soon as the start-up chime plays, press the Option key (Alt). Step 2: Choose the USB drive on the.

Apple released macOS Big Sur on November 12, 2020. macOS Big Sur continues the list of Central California landmarks as well as marks the new operating system for Mac. Those who tried it say that it’s more stable. It also sports a refreshed version of Safari that is 50% faster than Chrome. Here’s how to perform a clean install of macOS Big Sur with pictures and helpful tips along the way.

What is a clean install? (Big Sur or any other macOS)

Install Macos From Usb

A clean install means that you install the macOS onto the erased drive.

Why is clean install more preferable?
A clean install is the opposite of macOS upgrade. You format your hard drive, and therefore, it keeps no leftovers from the previous macOS.

  • macOS performs faster
  • You get rid of apps you don’t use
  • Persistent issues may go away

Basic steps to clean install macOS Big Sur

The first step is to clean and back up your Mac to some external source. Then, you’ll need to download macOS Big Sur package to your Applications. Next, you’ll need to create a bootable USB installer (involves another external drive). And lastly, we’ll use Disk Utility to erase your Mac and install macOS Big Sur using the bootable USB device.

1. Clean & Back up your Mac


Cleaning your Mac is generally a healthy practice but since we’re about to back your Mac up, it’s worthwhile to get rid of system junk first. After we’ve cleaned your Mac, you’ll end up with a refreshed system ready for a Time Machine backup.

Time Machine will make a snapshot of your system.But before that we’ll ensure there's no unwanted leftovers on your entire Mac. To clean your machine automatically, you can run CleanMyMac X. This tool is one of the best-known cleaning utilities for Mac, and it’s been notarized by Apple.

Download the free version of CleanMyMac X cleaner here.
Install the app and click on System Junk to perform the scan.

Back up your Mac

Now, you’re ready to back up your computer. There is a tool built just for that purpose, you guessed it, Time Machine. Time Machine needs a storage source onto which it will copy your system.
So, you’ll need an external drive. This is the first external drive that we will use to clean install macOS Big Sur. This is the reserve backup for the worst-case scenario.

  • Go to System Preferences > Time Machine.
  • Connect an external drive (that’s more spacious than your current system).
  • Select this Disk as a backup source in Time Machine.

Well done. The preliminary steps are done with, and we’re ready to clean install macOS Big Sur.

2. Download macOS Big Sur installer

macOS Big Sur has been released on November 12, 2020.

Since the public release in the fall of 2020, macOS Big Sur can be downloaded from the Mac App Store. It also can be found in the Software Updates pane in System Preferences.
So you’ll find it in System Preferences > Software Updates.

  • Click Upgrade Now

Wait for the installer to download onto your drive. You will see the macOS Big Sur intro screen.

Don’t click Continue but for now, close this window by choosing Quit Install.

We only want to make sure that the app called Install macOS Big Sur.App is now firmly sitting in your Applications.

This is the file we’ll use later to run the clean install of macOS Big Sur via Disk Utility.

Now, and only now have we come to clean installing macOS Big Sur. This is only a short stop on the road, so catch your breath, and let’s move along.


3. Create a bootable Big Sur installer

Now, it’s time to grab another USB flash drive and connect it to your Mac. This drive should have at least 16 GB of storage space.

Wipe the drive clean with Disk Utility

  1. Pick this drive and click Erase in the top menu.
  2. Double-check what you’re erasing.
  3. Make sure the USB drive is shown as “Untitled”
  4. Under Format, choose: Mac OS Extended (Journaled)

All data on that disk will be lost, so beware.

Go to Terminal (Phew, we’re almost there)

This step will actually create the source disk so we can install Big Sur from bootable USB.

Launch Terminal app from your Launchpad.

Paste in the following command:

sudo /Applications/Install macOS Big Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled

Type in your admin password and press Return and Y to confirm the action.

This command creates a bootable USB installer based on macOS Big Sur.app, which we’ve previously placed in your Applications.

4. Erase your startup drive in Disk Utility

It’s time to wave goodbye to your current configuration. Remember, we’ve already cleaned it up from junk with CleanMyMac X and backed it up onto our first reserve USB drive.

Now, start your Mac in Recovery mode:

  • Turn off your Mac and hold down Command + R.
  • Choose Disk Utility from the menu.
  • Choose your main startup drive and click Erase.

Voila! Your Mac is now formatted. What you can do now (actually, this the only thing you can do now) is to clean install macOS Big Sur 11 from the connected USB installer drive. If it’s not connected, connect the bootable USB installer now.

  1. Go back to the original Disk Utility screen
    (If you can’t return to Disk Utility, restart your Mac and hold down the Option key)
  2. Click Install macOS and choose to install it from the selected USB drive.
  3. Click on “Install macOS”

How do I regularly install macOS Big Sur?

The regular install is done via upgrading your current macOS. That is, you don’t erase your entire disk. When the new macOS Big Sur is officially released, you just open the App Store > Updates.

Or even better, go to your System Preferences > Software Updates

How to reinstall macOS Big Sur?

Macbook air install os from usb

If for some reason your Big Sur macOS doesn’t work as expected, you can reinstall it by sending your Mac into Recovery Mode.

  • Restart your machine and hold down ⌘ + R
  • Choose Reinstall macOS

That’s it.

As we’ve just seen, running a clean install of macOS Big Sur could be a crazy rabbit hole. We hope you survived. Now you’ll be rewarded with the best Apple’s operating system up to date. You’ll also have a clean Mac that works at blazing speed with a little extra help from our favorite Mac cleaner — CleanMyMac X. You can get started with a trial version — so download it here.

2021 MacBook Pro boot from USB – with video!

Starting in 2018 the Macbook Pro includes a secure boot chip that prevents your Macbook from booting windows, linux, BSD, gentoo, Fedora, Atlas Supervisor, other Mac O/S/s on a usb, etc.

You CAN boot a 2018 to 2021 Macbook Pro from USB!

But it does take a few steps to get there.

Fresh Install Macos From Usb


Step One

Boot into Recovery Mode

Install Macbook Air From Usb Hub

To access Recovery Mode, turn off your Macbook, turn it on and hold the Command (⌘) and R keys. Keep holding them through the chime sound until you see the Recovery Screen below…

Yaaay! You entered a secret level with hidden powers!

Step 2

Click on Utlities (on the menu bar at the top of the screen, don’t click on Disk Utlities in the middle of the screen)

Select ‘Startup Security Utility’ and you’ll get this screen…

Change the settings for both to the same as the image above.

Macbook Air India


Secure Boot to No Security

External Boot to Allow booting from external media

Exit out, shut down the laptop.

Step 3

Macbook Air Install Os From Usb

Plug in your bootable USB device and boot up your 2018 2019 Macbook Pro from USB, hold the Command (⌘) key and you’ll see the startup disk screen, select the USB and boot it up.

Caveats, notes and disclaimers.

  1. You need an uefi bootable image. (we’re uncertain of other workarounds for grub at this time)
  2. You may not have any access to the internal drive. Not sure if it is a linux driver issue or some sort of on chip security, but so far, no access.
  3. Leaving ‘external boot allowed’ is a risk that if stolen, someone might be able to access the internal drive.
  4. The law of unintended consequences. Apple rarely supports playing around with bootable O/Ss, you could brick an extremely expensive device.
  5. Apple does have further detail on the T2 security chip and how to use it. Read more before playing around too much in there.

The better option

If you are looking for a great laptop to run NinjaStik we recommend getting an IBM Lenovo T430i for ~$140 and using it. The T430i is one of the best value for $ deals to run a daily use linux based personal laptop. It’s ugly but it is a solid machine.

Using a $140 laptop for linux and not risking your $5000 Macbook Pro is our recommendation.