One high-quality USB flash drive with 16GB of storage.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.Ĭlick the Yes button to format the drive on the warning message.Ĭonfirm a name for the drive. Right-click the USB flash drive and select the Restore with Disk Image option from the left navigation pane.Ĭlick the Yes button to confirm the erase of the USB flash drive data. dmg file with the macOS installation files. 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, Sierra, Catalina, Big Sur, Monterey, or higher. Create a GPT partition on a USB flash drive #MAC OS BURN ISO BOOTABLE UPGRADE# 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.

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