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Apple [1] Disk Image is a disk image format commonly used by the macOS operating system. When opened, an Apple Disk Image is mounted as a volume within the Finder.. An 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 Software Restore or asr is a command line utility in Mac OS X used to apply a DMG disk image to a selected partition or mount point on a file system. It is often used for cloning large numbers of Macintosh computers. Apple Software Restore can read an image locally or from a server via HTTP or its own multicast asr:// URI.
Disk Copy was used for creating and mounting disk image files whereas Disk Utility was used for formatting, partitioning, verifying, and repairing file structures. The ability to "zero" all data (multi-pass formatting) on a disk was not added until Mac OS X 10.2.3 . [ 5 ]
HFS Plus is still supported by current versions of Mac OS, but starting with Mac OS X, an HFS volume cannot be used for booting, and beginning with Mac OS X 10.6 (Snow Leopard), HFS volumes are read-only and cannot be created or updated. In macOS Sierra (10.12), Apple's release notes state that "The HFS Standard filesystem is no longer supported."
File Allocation Table (FAT) is a file system developed for personal computers and was the default file system for the MS-DOS and Windows 9x operating systems. [citation needed] Originally developed in 1977 for use on floppy disks, it was adapted for use on hard disks and other devices.
Auto-detection of UDF file system on hard disk is supported since version 2.6.30. Auto-detection of UDF file system on disk images was fixed in 4.11. Mac OS 8.1–8.5: Yes No No No No No No Some earlier versions of Mac OS, such as 7.5, 7.6, and 8.0 are also supported via third-party utilities, along with additional UDF version support for 8.1 ...
Notable software applications that can access or manipulate disk image files are ... Windows, Linux, Classic Mac OS: Free software ... FAT16, FAT32, HPFS, JFS, Xfs ...
MDS – Daemon Tools native disc image format used for making images from optical CD-ROM, DVD-ROM, HD DVD or Blu-ray. It comes together with MDF file and can be mounted with DAEMON Tools. MDX – Daemon Tools format that allows getting one MDX disc image file instead of two (MDF and MDS). DMG – Macintosh disk image files; CDI – DiscJuggler ...