


This macOS disk image format supports compression, file spanning, and file encryption, so some DMG files might be password secured. You’ll more than likely only see them when downloading Mac OS software from the internet. A file with the DMG file extension is an Apple Disk Image file, or sometimes called a Mac OS X Disk Image file, which is generally a digital restoration of a physical disc.įor this factor, a DMG is typically the file format used to keep compressed software installers rather of needing to use a physical disc.
