How to quickly create a macOS bootable USB on Windows 10

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Requirements

Before proceeding, you’ll need the following:

• Broken Mac computer running macOS.
• A trial copy of the TransMac software.
• One high-quality USB flash drive with 16GB of storage.
• Copy of macOS (DMG file).

Create macOS bootable USB installation media

To create a bootable USB drive with macOS, use these steps:

1. Download and install TransMac on Windows 10.

   Quick note: This is a paid piece of software, but it gives you a 15-day trial, which is more than enough time. (If this works for you and you want to support the developer, you can purchase the full version.)

2. Connect the USB flash drive.

   Important: If you have any data on the flash drive, remember to back it up since this process will erase everything on it.

3. Right-click the TransMac app and select the Run as administrator option.

4. Click the Run button. (If you use the trial version, wait 15 seconds.)

   

5. Right-click the USB flash drive and select the “Format Disk for Mac” option from the left pane.

   

   Quick note: You want to do this before creating the bootable media because there is a good chance that the drive was formatted using a Windows device. If this is the case, the chances are it’s using an MBR partition, and the USB drive needs a GPT partition to work on a Mac.

6. Click the Yes button to format the drive on the warning message.

   

7. Confirm a name for the drive. For example, “macOS bootable USB.”

8. Click the OK button.

   

9. Click the Yes button.

   

10. Click the OK button.

11. Right-click the USB flash drive and select the “Restore with Disk Image” option from the left pane.

    

12. Click the Yes button to confirm the erase of the USB flash drive data.

    

13. Click the browse button on the right.

14. Select the .dmg file with the macOS installation files.

    

15. Click the Open button.

16. Click the OK button.

17. Click the Yes button.

    

Once you complete the steps, you can insert the USB flash drive on your Mac computer to install, reinstall, or upgrade the operating system to the latest macOS version (Ventura, Monterey, Big Sur, Catalina, or Sierra).

Create a GPT partition on a USB flash drive

If the USB flash drive is not working with TransMac, it could still be a partition problem. In this case, you may need to redo the entire process again. However, this time, you should use the following steps to use the Diskpart command-line utility on Windows 10 to create the appropriate GPT partition, and then follow the above instructions.

To create a GPT partition on a removable drive, use these steps:

1. Open Start.

2. Search for Command Prompt, right-click the top result, and select the Run as an administrator option.

3. Type the following command and press Enter:

   diskpart

4. Type the following command to view all drives connected to your computer and press Enter:

   list disk

5. Type the following command with the number assigned for the USB flash drive and press Enter:

   select disk 4

   In the command, change “4” to the number corresponding to the USB flash drive.

6. Type the following command to clean the drive and press Enter:

   clean

7. Type the following command to convert the drive to the GPT style and press Enter:

   convert gpt

8. Type the following command to create a primary partition and press Enter: create partition primary 

   create partition primary

Once you have formatted the USB flash drive with a GPT partition, you can use the instructions mentioned above to use TransMac to create a bootable media, but this time skip steps 5 through 10 and continue on step 11.

After the process is complete, which it’s something that could take up to an hour, connect the USB flash drive and power on your Mac by holding down the Option key, and select the USB drive to begin installing macOS.