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Apple has just released the latest update to macOS. The update, named macOS Catalina, brings a bucket-full of new features including the ability of using iPad as an external screen for Mac. It also officially kills the 20-year-old iTunes (on Mac) and brings separate apps to manage music and podcasts while also adding a new TV app.

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Other notable changes include the abandonment of 32-bit apps in favour of 64-bit apps, refreshed Reminders, Photos, Mail, Safari, and Notes apps, and the introduction of Apple Arcade among others.

Whether you should upgrade your Macs to the new macOS Catalina is entirely up to your current workflow. The change that could affect it the most is the support for 32-bit apps being officially dropped. If you rely on old apps that needs an update for the new platform, you might want to hold your upgrade until these apps are updated or you find alternatives.

With macOS Catalina, Apple has changed the way you used to download the installer. Previously, you would download the new OS installer from AppStore itself and then use that installer to make a bootable installer for later use. In Catalina, when you click the Get button in AppStore, you are taken to the Software Update screen to download the new update.

This change makes is a bit tricky to create a bootable install media like a USB stick or memory card. Albeit not as straightforward as before, but it is definitely possible to make a bootable installer for macOS Catalina. This tutorial shows how to do that.

Update – 12th November, 2020: The latest update to macOS is out now. Learn how to make a bootable macOS Big Sur installer.

Make a Bootable macOS USB Stick or Memory Card

Before you begin:

• Make sure you have a USB stick aka pen drive aka flash drive or memory card aka SD card with at least 16GB of storage.
• Take complete backup of data on your Mac.
• Make sure you have a working, strong, and stable Wi-Fi connection to download macOS Catalina.

Step 1

Due to the way you get your copy of macOS Catalina has changed a bit, we will rely on a third-party app which will help us get the installer. The app we will use for this is called macOS Catalina Patcher which is primarily used to make a patched installer for old Macs that don’t support new versions of macOS.

Download macOS Catalina Patcher, place it under Applications, launch it, and click Continue. Click Download a Copy.

Now, before you move to the next screen, click Options in the menu bar and disable ‘Auto-apply Post Install Patches.’ After that, click Start Download and wait for the download — that is around 8GB — to finish.

Update: I just read other tutorials mentioning that you don’t need macOS Catalina Patcher. You can download macOS Catalina installer from the Software Update screen and it’s placed under Applications. If you wish to go ahead with that method, you can change the path in the Step 3 from Downloads to Applications.

Step 2

Once the download is finished, you can see ‘macOS Catalina Installer” under Downloads folder. Now it’s time to erase your USB stick or memory card.

Insert the medium you wish to use for creating a bootable installer in your Mac and open Disk Utility. Select the medium from the list on left and click Erase. Select Mac OS Extended (Journaled) under Format. Type Untitled in Name field (you can choose any name here).

Click Erase and wait for the process to finish. Remember that you are completely erasing the data on this media.

Step 3

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Now you are ready to move to the final step which is to create the bootable macOS Catalina media.

Open Terminal and type the following command. Make sure you don’t leave any spaces in-between.

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sudo /Downloads/Install macOS Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled

Note: Replace Untitled (in bold above) with whichever name you gave in step 2.

If copying and pasting or typing this command doesn’t work, you can do the following.

Type sudo in Terminal and keep the window open. Now open Downloads folder and drag the macOS Catalina Installer file on the Terminal window. It will automatically generate the path where your Catalina installer is located.

Now, append --volume /Volumes/Untitled at the end of the automatically generated string and press Return key on keyboard. Note that there are two dashes (--) before volume and a space after volume.

Enter your password, press Y and press enter to start the process and let it finish — which will take about 15 minutes.

How to Install macOS Catalina from a Bootable Volume?

Once Terminal finishes the process, you can restart your Mac and when it is booting up, press and hold Option key until you see a black screen with an option to select the startup disk.

Select Install macOS Catalina and click continue. Let the installer load and once it’s finished, you should enter macOS Recovery screen which will ask you to select a user account which you know the password of. Choose your administrator account and enter its password.

Now click Disk Utility and continue. Select the volume where your current macOS is installed. The volume is usually named macOS. Click Erase. Leave the options as default and click Erase again.

After the process finishes, close Disk Utility and you will return to the recovery screen. This time, select Install macOS and continue.

Let the install process finish, which consists of a couple of automatic reboots. Once finished, you should see the initial macOS setup screen. After you are done with this on-boarding step, you will see the desktop and are all set to start using macOS Catalina on your Mac.

Making a Bootable macOS Installer Media: Summing Up

Bootable macOS installer is useful if you want to completely erase your Mac and reinstall the operating system, or if you have more than one Macs and you don’t want to spend time (and bandwidth) downloading the macOS update.

Making a bootable macOS Catalina installer isn’t too complicated. You can make a bootable flash drive aka pen drive aka USB stick or memory card and use it to install the latest macOS version on your Mac.

That’s it, folks. This was a quick tutorial on how to create a bootable macOS Catalina installer on a flash drive or memory card. I hope you found it useful.

Using both Windows and macOS, and suddenly mac refuses to boot. The reason behind this can be from a number of things that could go wrong. This includes system failure, bad updates, power failure, hardware failure. Unless there is a hardware problem that only can be diagnosed at the apple center you can fix your Apple computer.

It is an excellent practice always to have a bootable macOS USB, which you can easily create using macOS operating system. But since we’re here, you probably can want to make bootable USB using Windows 11 and 10. Let’s be real, and there are more Windows computers compared to MAC. Fortunately, you can use a Windows computer to create a bootable USB flash drive.

In this article, we’ll help you with the instructions to create a bootable macOS USB installation media from a Windows computer. So that you can use that USB to install or reinstall (upgrade) Apple’s macOS. You can create a macOS Catalina/sierra bootable USB using this guide to fix your operating system.

What’s needed?

You will need a few things before you get started. The first essential thing in it is a USB drive would be awesome if you use a USB 3.0, but you can get the work done using a slow USB as well. So, in contrast, you need the following things.

1. One high-quality USB flash drive with 16GB of storage.
2. TransMac software.
3. MacOS operating system image (DMG file).

How to Create a macos Catalina bootable usb

The guide is simple and straightforward if you follow these steps.

Download and install TransMac on your Windows PC. It’s paid software with a 15-day trial, so you can use it within the time to create a bootable macOS USB flash drive. If you like the software and to support the developer you can buy the full version.

Plug the USB drive into your Windows computer that you’ll be using to fix your MacOS. And we are going to tell you something straightforward – backup if things are stored in USB Drive.

Step 1. Open the TransMac, and select Run as administrator. If you’re using the trial version, wait 15 seconds, and click Run.

Step 2. Use your USB drive right-click on it and select format disk format this will format the USB drive so that it can be used to store the Mac OS operating system. One thing you need to take care of that the USB drive needs in GPT partition in order to work on a Mac computer otherwise it won’t boot.

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When it prompts select a name for your USB it doesn’t matter but just do it and click ok. If the formatting is completed successfully, click OK to continue.

Step 3. Again from the left sidebar right-click on the USB drive and select restore with disk image.

Step 4. Now browse to the location where the Mac OS system image file is located and click ok to load it.

Step 5. Click Yes to create the macOS USB bootable media.

It will take a few minutes to complete the process because the Mac Operating System is larger than any other operating system like Windows and LINUX in size. Now plug the USB drive into Mac computer in order to install, install or upgrade the operating system to the latest version of Mac OS, which can be Sierra or later.

THE TOOL CAN

• Apple File System (APFS) volume read support.
• Open Mac APFS/HFS/HFS+ format disk drives, flash drives, CD/DVD/Blu-ray media, HD floppies, dmg, dmgpart, sparsebundle and sparseimage files.
• Copy files to Mac HFS+ disks and dmg images.
  Format as HFS+ for Mac .
• Save and restore images of disks and flash drives.
• Create, compress, expand and split dmg files.
• Built in burner functionality to burn ISO and dmg files directly to CD/DVD/Blu-Ray.
• Read Mac multisession and hybrid CDs.
• View partition layout.

How to create a GPT partition on a USB flash drive

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If the USB flash drive is not working using TransMac, it could be still a partition problem. In this case, you want to redo the entire process again, but this time use the following steps to use the Diskpart command-line utility on Windows to create the appropriate GPT partition.

1. Open Command Prompt as an administrator. Type cmd in run dialog or open it from the start menu.
2. Type the diskpart command and press Enter. This will display that is connected to your computer.
3. Enter the list disk command to view all drives connected to your computer and press Enter. This command will show all of the partitions inside of a disc.
4. Type the select disk command followed the number assigned for the USB flash drive (e.g., select disk 4), and press Enter. This command will select the disc partition of your choice.
5. Enter the clean command and press Enter. This erases and formats the disc.
6. Type the convert GPT command and press Enter. This convert master boot record to new GPT.
7. Enter the create partition primary command and press Enter to complete the process.

Quickly create a macOS bootable USB on Windows

Now make a bootable USB using the TransMac software (follow instructions that are given above). Now connect the USB and power on your Mac computer while holding the option key and then select the USB Flash media to run the installation.

Learn using USB on MAC (Apple support page)

Learn more about making bootable USBs.

Make a bootable USB of Windows, Linux, Chrome and Android OS
Windows 10 Media creation tool Download and Creating Bootable USB Media

Catalina Dmg Bootable Usb Download

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