Once the copy is finished, unmount the volume to prepare for conversion: hdiutil detach /Volumes/Install\ macOS\ [Version] 5. Convert DMG to ISO

You should always create your own ISO from a legitimate macOS installer downloaded from the Mac App Store to ensure the file is secure and untampered.

Unmount the disk and convert it to the final format: hdiutil detach /Volumes/Install\ macOS\ [Name] hdiutil convert /tmp/macOS.dmg -format UDTO -o ~/Desktop/macOS.cdr mv ~/Desktop/macOS.cdr ~/Desktop/macOS.iso 3. Versions and Availability

hdiutil convert /path/to/file.iso -format UDRW -o output.dmg

macOS dd usually fails to produce a bootable Windows USB. Use third-party tools like BalenaEtcher or UNetbootin.

Different macOS versions require different disk sizes for the ISO. Modern versions like or macOS Sequoia typically require at least 16GB of space. macOS Version Release Year Primary Use Case macOS Sequoia Latest features and Apple Intelligence support. macOS Sonoma High stability for modern virtual machines. macOS Monterey Common for older Hackintosh builds and testing. macOS Catalina

hdiutil convert /path/to/file.dmg -format UDTO -o output.iso

While Apple officially provides macOS installers as .dmg or .app files, users often need a to install the operating system on non-Apple hardware, such as virtual machines (VirtualBox, VMware) or "Hackintosh" systems. Creating an ISO requires using the macOS Terminal to convert the official installer into a bootable disk image. 1. Why Do You Need a macOS ISO?

A common need: write a Linux or Windows ISO to a USB stick.

An ISO file, also known as an ISO image, is a type of file that contains the contents of an optical disc, such as a CD, DVD, or Blu-ray disc. It's a single file that can be used to create a bootable disc or mounted as a virtual drive.

There are a few ways to create a macOS ISO:

If you need an ISO of macOS installer (e.g., for a VM):

sudo /Applications/Install\ macOS\ [Version].app/Contents/Resources/createinstallmedia --volume /Volumes/[Version] --nointeraction Note: You will need to enter your Mac password. 4. Unmount the Volume