Here is a free and open-source tool to write a raw disk image file to a removable device (say USB or flash drive). The tool is named Win32 Disk Imager.

Although .dmg is a macOS disk format, there are a number reasons of why you'd want open them on Windows computers. Here's how to get started.

Archive a folder Open the Disk Utility app that came with your Mac. Choose File then New Image and lastly Image from Folder. Then pick a folder with all of the files you want to save to the DMG.

Honestly I was surprised at how difficult that was to upgrade a Win 7 Home system with an IMG file purchased through my University. I don't know what they expect the average populous to do ...

So you downloaded an .iso or .dmg file, and now you want to burn it to CD or DVD on your Mac. Fear not! No extra software is required.

Launch Disk Utility and choose File > New > New Disk Image. In the New Blank Image window that appears name your image—something like My Secret Stuff.

How to turn your Windows 10 upgrade files into an ISO disk image One question I've been asked more than any other in recent weeks is whether Microsoft will release Windows 10 in ISO format.