What Is Dmg File Format

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Apple Disk Image
The icon represents an internal hard drive within a generic file icon.
Filename extension.dmg, .smi, .img
Internet media typeapplication/x-apple-diskimage
Uniform Type Identifier (UTI)com.apple.disk-image
com.apple.disk-image-smi
Developed byApple Inc.
Type of formatDisk image
  1. DMG files are native to Mac OS X and are structured according to Universal Disk Image Format (UDIF) and the New Disk Image Format (NDIF). They can be accessed through the Mac OS Finder application by either launching the DMG file or mounting it as a drive.
  2. Files with the DMG extension represent mountable disk images for Mac OS X. Since this format allows data compression and encryption,.dmg files are commonly used for software download, installation and distribution on Apple devices.
  3. What is dmg file? This Mountable disk image created in Mac OS X is used for Mac OS software installers that are downloaded from the Internet. How to use our website to open your file.
  4. DMG files are files that are treated like actual hard disks by the Macintosh OS X operating system. These files can be created with Disk Copy, burned to a CD or even mounted as a normal volume on Macintosh computers. They often contain raw blocks of data.

A DMG Disk Copy Disk Image File is a special file format by Apple Inc. And should only be edited and saved with the appropriate software. How to solve problems with DMG files Associate the DMG file extension with the correct application. Mar 01, 2012  File Extension DMG File Format. Share this item with your network: Word of the Day. Amazon Personalize. Amazon Personalize is a low-code recommendation engine that can generate custom recommendations for any application running on Amazon Web Services (AWS) infrastructure. Open DMG File. The usage of the DMG file extension is in the context of a mountable disk image file which is generated by the Mac OS X Operating System platform. Once the file is opened, the system will mount it in a virtual disk located on the user's desktop.

Apple 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 Macintosh Finder.

Dr cleaner mac download dmg. An Apple Disk Image can be structured according to one of several proprietary disk image formats, including the Universal Disk Image Format (UDIF) and the New Disk Image Format (NDIF). An Apple disk image file's name usually has '.dmg' as its extension.

  • 3File format

Features[edit]

Apple Disk Image files are published with a MIME type of application/x-apple-diskimage.

Different 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.[1] Some of the file systems supported include Hierarchical File System (HFS), HFS Plus, File Allocation Table (FAT), ISO9660 and Universal Disk Format (UDF).[1][2]

Apple 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. These utilities can also use Apple disk image files as images for burning CDs and DVDs. Disk image files may also be managed via the command line interface using the hdiutil utility.[3]

In Mac OS X v10.2.3, Apple introduced Compressed Disk Images[4] and Internet-Enabled Disk Images for use with the Apple utility Disk Copy, which was later integrated into Disk Utility in 10.3. The Disk Copy application had the ability to display a multi-lingual software license agreement before mounting a disk image. The image will not be mounted unless the user indicates agreement with the license.[5]

An 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.

History[edit]

Apple 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. Even as the use of resource forks declined with Mac OS X, disk images remained the standard software distribution format. Disk images allow the distributor to control the Finder's presentation of the window, which is commonly used to instruct the user to copy the application to the correct folder.

A previous version of the format, intended only for floppy disk images, is usually referred to as 'Disk Copy 4.2' format, after the version of the Disk Copy utility that was used to handle these images.[1] A similar format that supported compression of floppy disk images is called DART.[1][6]

New Disk Image Format (NDIF) was the previous default disk image format in Mac OS 9,[1] and disk images with this format generally have a .img (not to be confused with raw .img disk image files) or .smi file extension. Files with the .smi extension are actually applications that mount an embedded disk image, thus a 'Self Mounting Image', and are intended only for Mac OS 9 and earlier.[7][2]

Universal Disk Image Format (UDIF) is the native disk image format for Mac OS X. Disk images in this format typically have a .dmg extension.[1]

File format[edit]

Apple has not released any documentation on the format, but attempts to reverse engineer parts of the format have been successful. The encrypted layer was reverse engineered in an implementation called VileFault[8] (a spoonerism of FileVault).

Apple disk image files are essentially raw disk images (i.e. contain block data) with some added metadata, optionally with one or two layers applied that provide compression and encryption. In hdiutil these layers are called CUDIFEncoding and CEncryptedEncoding.[1]

UDIF supports ADC (an old proprietary compression format by Apple), zlib, bzip2 (as of Mac OS X v10.4), and LZFSE (as of Mac OS X v10.11)[9] compression internally.

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Trailer[edit]

The trailer can be described using the following C structure.[10] All values are big-endian (PowerPC byte ordering)

Here is an explanation:

Position(in Hex)Length (in bytes)Description
0004Magic bytes ('koly').
0044File version (current is 4)
0084The length of this header, in bytes. Should be 512.
00C4Flags.
0108Unknown.
0188Data fork offset (usually 0, beginning of file)
0208Size of data fork (usually up to the XMLOffset, below)
0288Resource fork offset, if any
0308Resource fork length, if any
0384Segment number. Usually 1, may be 0
03C4Segment count. Usually 1, may be 0
04016128-bit GUID identifier of segment
0504Data fork checksum type
0544Data fork checksum size
058128Data fork checksum
0D88Offset of XML property list in DMG, from beginning
0E08Length of XML property list
0E8120Reserved bytes
1604Master checksum type
1644Master checksum size
168128Master checksum
1E84Unknown, commonly 1
1EC8Size of DMG when expanded, in sectors
1F412Reserved bytes (zeroes)

Utilities[edit]

There are few options available to extract files or mount the proprietary Apple Disk Image format. Some cross-platform conversion utilities are:

  • dmg2img was originally written in Perl; however, the Perl version is no longer maintained, and the project was rewritten in C. Currently, without additional tools, the resulting images may be mounted only under Mac OS X and under Linux (provided hfsplus support has been enabled). UDIF ADC-compressed images have been supported since version 1.5.[11]
  • DMGEXtractor is written in Java with GUI, and it supports more advanced features of dmg including AES-128 encrypted images but not UDCO images.[12]
  • 7-Zip, including the free cross-platform port of its command-line interface, p7zip.
What

In Windows, most dmg images can be opened using several other programs such as UltraISO and IsoBuster. MacDrive can also mount simple dmg files as drives under windows, but not sparse disk or encrypted dmgs.[13] A free Apple DMG Disk Image Viewer also exists.[14]

In Linux and possibly other Unix flavors, most .dmg files can be burned to CD/DVD using any CD-burner program (using cdrecord directly or a front-end such as K3B or Brasero) or directly mounted to a mountpoint (e.g. mount -o loop,ro -t hfsplus imagefile.dmg /mnt/mountpoint).[15][16] darling-dmg is a FUSE module enabling easy DMG file mounting on Linux.[17]

See also[edit]

References[edit]

Dmg Extractor For Windows 7

  1. ^ abcdefg'hdiutil(1) Mac OS X Manual Page'. Archived from the original on 2016-05-14. Retrieved 2016-05-14.
  2. ^ ab'Mac OS X: Using Disk Copy disk image files'. Archived from the original on 2013-12-19. Retrieved 2013-04-25.
  3. ^hdiutil(1) – Darwin and macOS General Commands Manual
  4. ^'Re: Some apps refuse to launch in 10.2.8! (OT, but very important)'. Archived from the original on 2014-01-17.
  5. ^'Guides'. Apple. Archived from the original on 2009-03-06. Retrieved 2010-10-27.
  6. ^'DART 1.5.3: Version Change History'. Archived from the original on 2013-12-19. Retrieved 2013-04-25.
  7. ^'Software Downloads: Formats and Common Error Messages'. Archived from the original on 2010-12-24. Retrieved 2009-05-06.
  8. ^'VileFault'. 2006-12-29. Archived from the original on 2007-01-09. Retrieved 2010-10-27.
  9. ^Michael Tsai (2015-10-07). 'LZFSE Disk Images in El Capitan'. Archived from the original on 2017-04-09. Retrieved 2017-04-09.
  10. ^'Demystifying the DMG File Format'. Archived from the original on 2013-03-17.
  11. ^'dmg2img'. Archived from the original on 29 November 2010. Retrieved 2010-10-27.
  12. ^'DMGExtractor'. Archived from the original on 2011-01-02. Retrieved 2011-01-03.
  13. ^MacDrive Features / Boot Camp / System Requirements /. 'MacDrive Home page'. Mediafour. Archived from the original on 4 October 2010. Retrieved 2010-10-27.
  14. ^Olivia Dehaviland (2015-03-03). 'Apple DMG Disk Image Viewer'. DataForensics.org. Archived from the original on 2015-04-02. Retrieved 2015-03-10.
  15. ^'How To Convert DMG To ISO in Windows, Linux & Mac'. Archived from the original on 2010-03-07.
  16. ^'Convert DMG To ISO using PowerISO'. Archived from the original on 2009-05-02. Retrieved 2009-02-15.
  17. ^'darling-dmg'. darling-dmg. Retrieved 29 March 2015.

External links[edit]

  • Apple Developer Connection A Quick Look at PackageMaker and Installer
  • O'Reilly Mac DevCenter Tip 16-5. Create a Disk Image from a Directory in the Terminal
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Apple_Disk_Image&oldid=917998972'

DMG may refer to:

  • 1Organizations

Organizations[edit]

Entertainment[edit]

  • Dames Making Games, a Canadian non-profit organization that encourages the participation of women, non-binary, femme and queer people in the creation of video games
  • Davidson Media Group, an American radio station holding company
  • Diamante Music Group, a former American music record label distributor
  • Disney Music Group, a record label group
  • DMG Entertainment, a Chinese-based film production and distribution company
  • DMG Nashville, a brand of Hollywood Records
  • DMG Radio Australia, owner of the Nova and Classic Rock radio networks
  • DMG TV, part of the British record label Demon Music Group

What Is Dmg File Extension

Other organizations[edit]

How To Open Dmg File

  • Daily Mail and General Trust, an international media company
  • Daimler Motoren Gesellschaft (now Daimler AG), an early German automobile manufacturer
  • Deckel Maho Gildemeister, earlier name of DMG Mori Aktiengesellschaft, a German engineering company
  • Deutsche Morgenländische Gesellschaft (German Oriental Society), organization that studies Asia and the Orient
  • District Management Group, an elite cadre of the Civil Service of Pakistan, now known as the Pakistan Administrative Service
  • DMG interpersonal, a club for Charities in Germany
  • DMG Media, a national newspaper and website publisher in the UK
  • DMG Mori Seiki Co., a Japanese tools manufacturing company
  • D.M.G. Grupo Holding S.A., a Colombian company disbanded under the suspicion of money laundering

Science and technology[edit]

  • Dimethylglycine, a derivative of the amino acid glycine
  • Dimethylglyoxime, an organic chemical used in analysis as a precipitant for palladium or nickel
  • Direct metalation group, the target of directed ortho metalation
  • Dot Matrix Game, the official product code for the original Game Boy handheld video game system
  • .dmg file, the Apple Disk Image, a file format used in the macOS computer operating system

Other uses[edit]

  • Decoration for Merit in Gold, a South African military decoration
  • DMG (rapper), a rapper from Saint Paul, Minnesota
  • DMG 90, an edition of the Holden Commodore
  • Dungeon Master's Guide, a rulebook for the game Dungeons & Dragons
  • ISO 639:dmg or Kinabatangan language, a language of Malaysia

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Retrieved from 'https://en.wikipedia.org/w/index.php?title=DMG&oldid=920459888'