Prepare a flashdrive in mac for windows boot

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This article shows you how to download a macOS DMG file, format a USB drive using a GUID Partition Table, burn the DMG to the drive and boot your Mac from the USB.

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But how do you create such a disk if all you're left with is a Windows 10 computer? Fortunately, there's a great tool that you can use for free to create bootable macOS media on a USB drive in a Windows 10 environment. If your Mac suddenly refuses to boot up properly, you might need a bootable macOS USB installer to make repairs.