That drive must also be formatted with a GUID Partition Table. Whichever method you use, you need a Mac-formatted drive (a hard drive, solid-state drive, thumb drive, or USB stick) that’s big enough to hold the installer and all its data-I recommend at least an 8GB flash drive. The Disk Utility-via-Terminal approach is for the shell junkies out there. The Disk Utility method is the way to go for people who are more comfortable in the Finder (though it does require a couple Terminal commands), and it works under Snow Leopard, Lion, Mountain Lion, Mavericks, and Yosemite. (Note that the createinstallmedia tool doesn’t work under OS X 10.6 Snow Leopard-it requires OS X 10.7 Lion or later.) The createinstallmedia method is the easiest if you’re at all comfortable using Terminal, it’s the approach that I recommend you try first. I’ve come up with three ways you can create a bootable OS X install drive for the Yosemite: using the installer’s built-in createinstallmedia tool using Disk Utility or performing the Disk Utility procedure using Terminal. 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.Īfter 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.Create the Yosemite install drive: The options Type the following command to create a primary partition and press Enter: create partition primary create partition primary Type the following command to convert the drive to the GPT style and press Enter: convert gpt Type the following command to clean the drive and press Enter: clean In the command, change “4” to the number corresponding to the USB flash drive. Type the following command with the number assigned for the USB flash drive and press Enter: select disk 4 Type the following command to view all drives connected to your computer and press Enter: list disk Type the following command and press Enter: diskpart Search for Command Prompt, right-click the top result, and select the Run as an administrator option. To create a GPT partition on a removable drive, use these steps: However, this time, you should follow these steps to use the Diskpart command-line utility on Windows 10 (or 11) to create the appropriate GPT partition, and then follow the above instructions. In this case, you may need to redo the entire process. If the USB flash drive is not working with TransMac, it could still be a partition problem. Create a GPT partition on a USB flash drive Once you complete the steps, you can insert the USB flash drive on your Mac to install, reinstall, or upgrade the operating system to the latest macOS version (Ventura, Monterey, Big Sur, Catalina, or Mojave). Select the “.dmg” file with the macOS installation files. Right-click the USB flash drive and select the “Restore with Disk Image” option from the left pane.Ĭlick the Yes button to confirm the erase of the USB flash drive data. 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.Ĭlick the Yes button to format the drive on the warning message.Ĭonfirm a name for the drive. 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. To create a bootable USB drive with macOS, use these steps:ĭownload and install TransMac on Windows 10. One high-quality USB flash drive with 16GB of storage.Ĭreate macOS bootable USB installation media.Create a GPT partition on a USB flash driveīefore proceeding, you’ll need the following:.Create macOS bootable USB installation media.This guide will teach you the steps to create a macOS bootable USB installation on Windows 10 (or 11), which you can use to reinstall or upgrade the Apple OS. You can use a Windows 11, 10, 8.1, or 7 computer to quickly create a USB bootable installation media to reinstall macOS Ventura, Monterey, Big Sur, Catalina, or Mojave on your Mac. However, if none of your devices (MacBook, MacBook Air, MacBook Pro, iMac, Mac Pro, or Mac Mini) are not working when you need them the most, you can use a Windows computer to rescue your Apple device. This is one of the main reasons you should consider creating a macOS bootable USB when your computer is working correctly. If the unexpected happens with an Apple computer, you can use a macOS bootable USB with the installation media to repair it. It’s a matter of time until the device refuses to start, which could happen for many reasons, including (and not limited to) file corruption, hardware failure, or buggy update. It doesn’t matter whether you use macOS, Windows 11, or Windows 10.
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