To start working with a DMG file it needs to be mounted. Think of DMG files as virtual disks, they can be mounted and unmounted like any other drive. macOS uses them to package multiple files and folders in one container which can be downloaded over the internet. General Information What DMG stands for?ĭMG stands for Disk iMaGe. For a long time, I thought that dmg file is just a special install package, but when working on the post about hiding files on Mac I found out that it is not so simple and I decided to investigate more. When you want to install a new app on a Mac, more often than not they will let you download a.