Create A Bootable Installer For Mac Os High Sierra

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Sep 27, 2017 How to Create a Bootable USB Installer for macOS High Sierra Justin Pot @jhpot September 27, 2017, 1:13pm EDT The Mac App Store is the default way to upgrade or install macOS, but it doesn’t work for everyone.

If you're thinking about installing macOS Catalina, the first thing to consider is whether you want to install it directly onto your Mac or create a bootable drive. You can use a bootable drive on a hard drive partition for dual-software installation, to install on multiple Macs in your home, or as a bootable drive if you can't use the Internet Recovery partition.

Note: These instructions require the use of Terminal. If you don't feel comfortable making changes to your Mac with Terminal, you can create a bootable disk using the DiskMaker X program.

Before you start

Before you get started, make sure you have a thumb drive with at least 15GB of storage, or a spare external hard drive (one you aren't planning to use for anything else). You'll also need to download macOS Catalina and ensure that it's sitting in your Applications folder.

Note: After macOS Catalina has downloaded, it will automatically launch the installer to begin the installation process. Free audio recorder for mac. Quit the installer when this happens.

And please: Don't forget to back up your Mac before you do anything.

How to format your external drive for macOS Catalina

You'll need to start with a clean thumb drive or external hard drive in order to make it a bootable drive.

  1. Plug the thumb drive or cable for your hard drive into the appropriate port on your Mac.
  2. Click on Finder in your Dock to open a Finder window.

  3. Select Applications from the list on the left side of the window.

  4. Scroll down and double-click on Utilities.

  5. Scroll down and double-click on Disk Utility.

  6. Select your thumb drive or external drive under External.

  7. Click on the Erase tab at the top of the window.

  8. Note the name of your external hard drive (probably 'Untitled') because you will need it when you create a bootable drive. If you have more than one external drive with the same name, you will need to rename the drive you are using as a bootable installer now.
  9. Select Mac OS Extended from the format list. Do not use the (Case sensitive) option.
  10. If Scheme is available, select GUID Partition Map.
  11. Click Erase.
  12. Click Done when the process is complete.

  13. Close the Disk Utility window.

Your thumb drive or external hard drive is now ready.

How to put macOS Catalina onto your external drive

Important: You will need to use an administrator account on your Mac in order to run the Terminal commands to create a boot drive. You'll also need to ensure that macOS Catalina is in your Applications folder and you'll need to know the name of the external drive.

High
  1. Click on Finder in your Dock to open a Finder window.

  2. Select Applications from the list on the left side of the window.

  3. Scroll down and double-click on Utilities.

  4. Scroll down and double click on Terminal.

  5. Recall the name of your formatted external drive when entering the following text into Terminal. If it is not named 'MyVolume,' you will need to change the command syntax for the pathname where it says: Volumes/MyVolume. The name of the drive can't have any spaces and it is case sensitive.

  6. Enter the following text into Terminal (Don't forget to change the name 'MyVolume' in the text below to the actual name of your external drive. Names are case sensitive and shouldn't have a space.):

    sudo /Applications/Install macOS Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

  7. Hit the enter/return key.

  8. Enter your administrator account password. This is the password you use to make changes on your Mac or log in. No text will appear in Terminal when you enter the password.

The process could take a very long time, depending on the drive. When it is done, the Terminal window will report 'Done.' Your external hard drive will now be named 'Install macOS Catalina.' Safely eject the drive from your Mac.

How to install macOS Catalina with a bootable installer drive

Once macOS Catalina is installed on your external drive, you can install it on any Mac with the drive plugged into it. You can use this installer to upgrade your operating system easily on multiple Macs or to help downgrade if you decide you want to go back to an earlier version of macOS.

Create A Bootable Installer For Mac Os High Sierra Dmg

If you're downgrading from macOS Catalina, please check out this guide instead.

If you're upgrading to macOS Catalina, follow the steps below.

Create A Bootable Installer For Macos High Sierra

  1. Turn off the Mac you want to install macOS Catalina with the bootable installer drive.
  2. Connect the external drive to your Mac via the USB port.
  3. Turn on your Mac.
  4. Hold down the Option key when it starts up.
  5. Select the external drive with macOS Catalina on it from the list of systems to start up your computer.
  6. Follow the installation process when prompted.

Questions?

Do you have any questions about how to create a bootable drive for the macOS Catalina installer? Let us know in the comments. Mac os x versions.

Updated September 2019: Updated for macOS Catalina.

macOS Catalina

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What’s up guys, in this tutorial I’m going to show you How to Create Bootable USB Installer for macOS High Sierra Windows 10 Operating System. There are few applications that you need to download in-order to successfully create a bootable USB Flash Drive to install macOS High Sierra Windows 10 PC.

Firstly, you need to download TransMac application as we will use this to write files onto flash drive. Once you have downloaded and installed TransMac, run the application.
TransMac is a Paid Application. But the trial period will last for 15 days, this is more than enough for us to Create Bootable USB Installer for macOS High Sierra Windows 10.
Before you click Run, just make sure you have plugged-in your 16 GB USB Flash Drive.
Now, Click Run and proceed with the trial of 15 Days. You should see the following screen once you click Run.


Right-Click on your USB Flash Drive and select the option Format Disk for Mac.
When the warning pops-up click Yes.
TransMac will now ask you to name your ISB Drive. I will name my USB Drive as “USB Installer“, but you can name it anything you like. After you Name the USB Drive click OK.
Click Yes, when TransMac will give you the Overwrite warning.

Now, just wait for few moments, as the formatting process is going on.


Once the formatting is successfully completed you should get this following confirmation. If it is not a success, please follow the steps again and format your flash drive.
Click Ok, and now right-click on your USB Flash Drive again and select the option Restore with Disk Image.

Make A Bootable Usb Installer For Macos High Sierra

Click Yes, when TransMac gives you a warning for Overwriting.Next Step is to Select the dmg file for macOS High Sierra. You would need an Mac to download the macOS High Sierra Installation file from Apple Store.
To locate the DMG File, follow these steps
After you have downloaded the High Sierra app, locate the InstallESD.DMG from the installer.Create a bootable installer for macos high sierra

In Applications folder: Right-click on Install MacOS High Sierra app, then choose Show Packages Contents to reveal Contents folder.

The MacOS High Sierra InstallESD.DMG is found under: Contents/SharedSupport/

Now copy this InstallESD.DMG as you need it in TransMac to Create macOS High Sierra Bootable USB Installer on Windows 10.

Ok, so lets continue with TransMac Restore Disk Image to Drive. On this screen, select the InstallESD.DMG file and click OK.
Click Yes, when TransMac Gives you the Overwrite warning.
Now the TransMac will start the process of Restoring High Sierra Image on the Flash Drive. this will take 15-25 minutes, depending on the speed of your flash drive.


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