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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.
Notable software applications that can access or manipulate disk image files ... Linux, Classic Mac OS: Free software AcetoneISO: Yes: No: Yes: Yes: Yes: CD, DVD, ISO ...
When catalog file support was included in Mac OS, with the HFS filesystem, the resource fork was retained. macOS does retain the classic Resource Manager API as part of its Carbon libraries for backward compatibility. However, the resources themselves can now be stored in separate data files within the file system – the Resource Manager now ...
macOS stores resource forks and metadata (file attributes, other ADS) using AppleDouble format in a hidden file with a name constructed from the owner filename prefixed with "._", and Finder stores some folder and file metadata in a hidden file called ".DS_Store" (but note that Finder uses .DS_Store even on macOS' native filesystem, HFS+).
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 and 8.5. [f] Mac OS 8.6, Mac OS 9: Yes Yes No No No No No
Mac OS X Leopard added the ability to create, resize, and delete disk partitions without erasing them, a feature known as live partitioning. In OS X El Capitan , Disk Utility has a different user interface and lost the abilities to repair permissions due to obsolescence , [ 6 ] create and manage disks formatted as RAID , burn discs, and multi ...
It isn't uncommon to see a volume packed into a single file. Examples include ISO9660 disc images (CD/DVD images, commonly called "ISOs"), and installer volumes for Mac OS X . As these volumes are files which reside within another volume, they certainly are not partitions.
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."