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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. An Apple disk image file's name usually has ".dmg" as its extension. A disk image is a compressed copy of the contents of a disk or ...
In addition, .img is an Apple Disk Image used by the Mac OS X or macOS operating system. Garmin .img is a hard-disk image file format which contains a header and many subfiles and used to store the maps for its GPS units.
A disk image is a snapshot of a storage device's structure and data typically stored in one or more computer files on another storage device. [1] [2]Traditionally, disk images were bit-by-bit copies of every sector on a hard disk often created for digital forensic purposes, but it is now common to only copy allocated data to reduce storage space.
CDI – DiscJuggler image file; CUE – CDRWrite CUE image file; CIF – Easy CD Creator.cif format; C2D – Roxio-WinOnCD .c2d format; DAA – PowerISO .daa format; D64 – An archive of a Commodore 64 floppy disk. DAA – DAA: Closed-format, Windows-only compressed disk image; DMG – Macintosh disk image files; DMS – a disk-archiving ...
An archive format designed for the Apple II series of computers. The canonical implementation is ShrinkIt, which can operate on disk images as well as files. Preferred compression algorithm is a combination of RLE and 12-bit LZW. Archives can be manipulated with the command-line NuLib tool, or the Windows-based CiderPress. .sit application/ x ...
A sparse image is a type of disk image file used on macOS that grows in size as the user adds data to the image, taking up only as much disk space as stored in it. Encrypted sparse image files are used to secure a user's home directory by the FileVault feature in Mac OS X Snow Leopard and earlier.
Disk Copy was also the name of an Apple utility distributed with some of the earliest versions of the classic Mac OS.In order to copy 400K floppy disks using as few disk swaps as possible on a machine with only 128K of RAM, the original Disk Copy used the screen buffer to store binary data from the disk being copied; as a result, the screen (other than a small area at the bottom displaying the ...
The .ipsw file itself is a compressed archive file (renamed Zip archive) containing at least three Apple Disk Image files with one containing the root file system of the OS and two ram disks for restore and update. tvOS, audioOS and macOS also include a disk image for the recovery environment (recoveryOS).