1. Boot Macos Catalina From Usb Ports
  2. Boot Macos Catalina From Usb Adapter
  3. Macos Catalina Allow Boot From Usb

The method you used is intended to create a bootable installer on a USB flash drive. I suggest you try the following: Bootable USB Installers for OS X Mavericks, Yosemite, El Capitan, and Sierra. First, review this introductory article: Create a bootable installer for macOS. Second, read this How To outline for creating a bootable macOS installer. I have successfully installed macOS Catalina on my Lenovo ThinkPad T450 series. It was satisfying to run macOS on non-Apple hardware. In this article, I will start by creating the macOS Catalina 10.15.4 USB installation disk. There are several ways to create a USB installation disk. You can use Windows, macOS or even Linux. A USB 3.0 drive will make things significantly faster, but an older USB 2.0 drive will work in a pinch; 8GB drives worked for Mojave and older versions of macOS, but the Catalina installer is just.

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Home > Resources > Create macOS Catalina Bootable USB

In normal circumstance, you will get notified when macOS Catalina is available on your Mac computer. So you don't need additional effort to make a bootable USB. You can upgrade to Catalina directly by following Apple's guidelines. However, not all Macs are eligible for this upgrade. And sometimes, you need to install macOS Catalina on multiple devices. Or the Mac was broken and a fresh install is in demand. It is great to learn how to create macOS Catalina bootable USB by yourself.

Here you will get 4 utmost methods that will help you to create a bootable USB installer for macOS Catalina.

Get macOS Catalina from Apple Store

Step 1: Open App Store on your Mac, move to the search bar and then type 'Catalina' on the box.

Step 2: Soon, you will get the macOS Catalina and you need to click on the 'Get' button.

Step 3: Thereafter, a pop-up window will appear on your device screen asking for the confirmation to download and you need to click on the 'Download' button.

Step 4: After the completion of the download process, you wil get an app named Instal macOS Catalina in Application folder.

Method 1: Create macOS Catalina Bootable USB on Mac in Terminal

The Terminal method is the basic one that can easily create a bootable macOS installer. The app is already built in with macOS that enable the users to control Mac through commands. if you have a good grip on commands, then you can easily access the entire features of Mac. Now, go through the process to achieve your goal.

Step 1: Now, insert a USB on your Mac and then open the 'Application' through 'Finder'.

Step 2: Choose 'Utilities' listed under the 'Application' section and further select 'Terminal' that is under the sub-section of the utility section.

Step 3: In the Terminal box, you need to type or simply copy and paste the command provided below.

sudo /Applications/Install macOS Catalina.app/Contents/Resources/createinstallmedia—volume /Volumes/USBdrive —/Applications/Install macOS Catalina.app

Step 4: Now, press the 'Return key and after that, you will have to input the password from the terminal box, complete the task and again press the 'Return' key.

Step 5: The terminal will wipe out the data of USB and for that, you need to press the 'Y' key and further press the 'Return' key. Now, leave Mac for a while all alone as it will take a few moments to complete the process and once it is done, you will get the confirmation message on the screen.

That's it; eject USB drive as it is now turned into a bootable USB. This method is the traditional way and works for all the macOS versions. However, the method is a bit lengthy one and the booting process usually takes a long time, so if you want such a tool that can reduce all your effort, then go through the next method.

Method 2: Create macOS Catalina Bootable USB with DiskMaker X 9

DiskMaker X 9 for Catalina is a great tool built upon Apple Script. The main usage is to create bootable macOS Catalina USB in an efficient manner. The application is specially designed for this process. Once you launch the application, it will give its effort to get the OS and after getting the same, it will create the USB in bootable one in an efficient manner.

Step 1: First, you need to download DiskMaker X for 9 Catalina, and for that, go to the official site of DiskMaker, click on the 'Download' tab, and further click on the download link of 'DiskMaker X for 9 Catalina'. However, if you want to reach directly, then click on the link below.

Step 2: Now install the application and after completing the same, launch it. Make sure the USB should be inserted on your Mac.

Download high sierra. Step 3: Soon, you will find a dialog box asking for the copy of the installer, if the path of macOS Catalina is detected by the tool, then you can select 'Use this Copy'. However, if the auto-detection fails to locate the path of macOS Catalina, then you can click on 'Select a macOS Installation App' button and then locate the respective file.

Step 4: Thereafter, DiskMaker will look for the disk and will give three options. Please choose 'Another kind of disk (erase only partition)' this time.

Step 5: Now, select a target USB name from the list and a warning message will appear on the screen showing 'Data will be erased', beneath the same there is a button 'Erase then create the disk', click on it.

Step 6: Again, a new pop-up will appear on your Mac, and this time, it will ask for login password. Please provide the same and then click on the 'Continue' button.

That's it. DiskMarker X 9 for Catalinal will start performing the task in background and once it is completed, it will display a successful message on Mac screen.


DiskMaker X 9 for Catalina is an ultimate tool and within a short time, it can create a bootable USB of macOS Catalina. The interface is outstanding as it offers guidance at each step and helps the users to complete the action efficiently. The application is free for use and can be used by any Mac users.

Method 3: Create macOS Catalina Bootable USB Using Etcher

Etcher is another powerful tool that burns the image file (.dmg) of the macOS operating system to USB in a smooth manner. It is an open-source freeware application that supports multiple files such as ISO, DMG, IMG, ZIP and many more. Etcher is easy to use and through the same, you can create a bootable USB for macOS Catalina.

Step 1: Download the Etcher application from the official site and after that install it.

Step 2: Now, launch Etcher and on the home page, you will get the 'Select Image' option, click on it and then import macOS Catalina dmg file into it. If you did not have one, please download the dmg file from here.

Step 3: After that, you need to select the drive, click on it and select USB drive.

Step 4: Further, click on the 'Flash' option. Soon, Etcher will start the burning process and within a short time, it will create a Catalina installer USB.

Etcher is the smartest tool that has the potential to create a bootable USB in a short period. Even you have seen the process comprises of few steps and it gives the result instantly. So, go through this tool and save your time and effort.

Method 4: Create macOS Catalina Bootable USB via Install Disk Creator

Install Disk Creator is the lightest application that enables the Mac users to create a bootable macOS Catalina installer. It keeps the process simple and needs only an OS installer and a USB. The installation process is very fast and within a second, Install Disk Creator will be installed on your Mac machine. Now, let's go to the detailed method.

Step 1: Download Install Disk Creator and then install the app on your Mac.

Step 2: Now, launch the application and make sure the USB is connected to the machine.

Step 3: Soon, Install Disk Creator will detect the macOS Catalina and you just need to select the respected drive.After giving the USB path to the tool, you need to click on the 'Create Installer' button.

Step 4: Now, wait for a while as the process will take some time, and meanwhile you can look at the progress bar that will show the status. Once the process is completed, you will get a pop-up message showing the process is completed successfully. That's it; your job is done.

Install Disk Creator has a simple interface that will suit the mere novice and professionals too. It does not have multiple features and configuration, means you don't have to put stress on its settings part as the default setting is enough to do the task.


These were all about the ways to create macOS Catalina bootable on Mac computer. The Terminal method is a traditional one and most reliable, but it takes a lot of time and there should not be any error on command, otherwise, you won't get the result. Disk Maker X 9 for Catalina is fully automatic that will do your job smoothly. However, Etcher is also a smart tool and without consuming much time, it will deliver the result. Install Disk Creator is a simple one, but it will take a lot of time to fetch the result. Hence, you can choose Etcher or DiskMaker X 9 for Catalina for an optimum and instant result.

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These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

Boot Macos Catalina From Usb Ports

What you need to create a bootable installer

  • A USB flash drive or other secondary volume formatted as Mac OS Extended, with at least 14GB of available storage
  • A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan

Download macOS

  • Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra
    These download to your Applications folder as an app named Install macOS [version name]. If the installer opens after downloading, quit it without continuing installation. To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
  • Download: OS X El Capitan
    This downloads as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.

Use the 'createinstallmedia' command in Terminal

  1. Connect the USB flash drive or other volume that you're using for the bootable installer.
  2. Open Terminal, which is in the Utilities folder of your Applications folder.
  3. Type or paste one of the following commands in Terminal. These assume that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace MyVolume in these commands with the name of your volume.

Big Sur:*



High Sierra:*

El Capitan:

* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument and installer path, similar to the way this is done in the command for El Capitan.

After typing the command:

  1. Press Return to enter the command.
  2. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
  3. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased.
  4. After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume. Click OK to allow the copy to proceed.
  5. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur. You can now quit Terminal and eject the volume.

Use the bootable installer

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes and a gear icon labled Options.
  3. Select the volume containing the bootable installer, then click Continue.
  4. When the macOS installer opens, follow the onscreen instructions.

Intel processor

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
  3. Release the Option key when you see a dark screen showing your bootable volumes.
  4. Select the volume containing the bootable installer. Then click the up arrow or press Return.
    If you can't start up from the bootable installer, make sure that the External Boot setting in Startup Security Utility is set to allow booting from external media.
  5. Choose your language, if prompted.
  6. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Boot Macos Catalina From Usb Adapter

Learn more

For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter the appropriate path in Terminal:

  • Big Sur: /Applications/Install macOS Big Sur.app/Contents/Resources/createinstallmedia
  • Catalina: /Applications/Install macOS Catalina.app/Contents/Resources/createinstallmedia
  • Mojave: /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia
  • High Sierra: /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia
  • El Capitan: /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia

Macos Catalina Allow Boot From Usb

A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.

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