
To see the contents of a disk image, you must first open the disk image so it appears on the desktop or in a Finder window.Īpple Disk Image files are published with a MIME type of application/x-apple-diskimage.ĭifferent file systems can be contained inside these disk images, and there is also support for creating hybrid optical media images that contain multiple file systems. A disk image is a compressed copy of the contents of a disk or folder. An Apple disk image file's name usually has ".dmg" as its extension. When opened, an Apple Disk Image is mounted as a volume within the Finder.Īn Apple Disk Image can be structured according to one of several proprietary disk image formats, including the Universal Disk Image Format (UDIF) from Mac OS X and the New Disk Image Format (NDIF) from Mac OS 9.

Apple Disk Image is a disk image format commonly used by the macOS operating system.
