Īn Apple Disk Image allows secure password protection as well as file compression, and hence serves both security and file distribution functions such a disk image is most commonly used to distribute software over the Internet.Īpple originally created its disk image formats because the resource fork used by Mac applications could not easily be transferred over mixed networks such as those that make up the Internet. The image will not be mounted unless the user indicates agreement with the license. The Disk Copy application had the ability to display a multilingual software license agreement before mounting a disk image. In Mac OS X v10.2.3, Apple introduced Compressed Disk Images and Internet-Enabled Disk Images for use with the Apple utility Disk Copy, which was later integrated into Disk Utility in 10.3. Disk image files may also be managed via the command line interface using the hdiutil utility. These utilities can also use Apple disk image files as images for burning CDs and DVDs. Īpple Disk Images can be created using utilities bundled with Mac OS X, specifically Disk Copy in Mac OS X v10.2 and earlier and Disk Utility in Mac OS X v10.3 and later. Some of the file systems supported include Hierarchical File System (HFS), HFS Plus (HFS+), File Allocation Table (FAT), ISO9660, and Universal Disk Format (UDF). 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.
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