DMG is used for disk image files on Macintosh computers running Mac OS X. This file extension replaces the older file extension IMG which was discontinued during the release of later series of Mac operating systems. You can open DMG file on Mac, Linux, and Windows operating systems but it will require additional software to be installed on Windows.

1. Macos Install Dmg File

• Nov 12, 2019  A DMG file is a mountable disk image created in macOS. It contains raw block data typically compressed and sometimes encrypted. DMG files are commonly used for macOS software installers that are downloaded from the Internet, which mount a virtual disk on the desktop when opened.
• MacOS x lion 10.7 is the most recent rendition of Mac with new highlights. Nonetheless, this refresh will keep running on Mac 2012 or later forms. On the off chance that you are running macOS X lion 10.7 or prior, you ought to probably move up to the most recent rendition of mac os x lion 10.7 from the App Store. Downloading Mac OSX Lion 10.7.
• Mac OS X has popularized the use of Disk Images (.dmg files) as a means of transferring software. They're easy to use once you get how they work. The.dmg file is the actual file that contains all the data. When you double click the.dmg file, it mounts a 'virtual' disk to your 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.

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.

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.

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:

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.

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]

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

Macos Install Dmg File

After a long period of time apple Release macOS Sierra after Mac OS X El Capitan. macOS Sierra brought a new journy for their users with parity cool and amazing features.

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I will not talk more on macOS Sierra in this article here we will help you to decide which is the best update for you. and whether you should upgrade your system to new macOS Sierra.

macOS Sierra DMG file is provided by apple Inc. and available for free download on the store for every Mac User.

but when it comes to windows user here we provide a direct download links for every update of macOS Sierra DMG File.

The two below links is for windows users who want to use macOS on Windows PC.

You may think which update is the best choice for you. i Explain every updates which can help you to download which update of macOS Sierra DMG file.

Download macOS Sierra DMG File

Download macOS Sierra 10.12.6 Combo Update – The macOS Sierra 10.12.6 update improves the security, stability, and compatibility of your Mac, and is recommended for all users.

This update::

• Resolves an issue that prevents making certain SMB connections from the Finder.
• Fixes an issue that causes Xsan clients to unexpectedly restart when moving a file within a relation point on a Quantum StorNext File System.
• Improves the stability of the Terminal app.

See Apple Security Updates for detailed information about the security content of this update.

Download macOS Sierra 10.12.6 Update – The macOS Sierra 10.12.6 update improves the security, stability, and compatibility of your Mac, and is recommended for all users. no hard changes on this update and combo update.

For more detailed information about this update, please visit: https://support.apple.com/kb/HT207835

Download macOS Sierra 10.12.5 Combo Update – The macOS Sierra 10.12.5 update improves the security, stability, and compatibility of your Mac, and is recommended for all users.

This update:

• Fixes an issue where audio may stutter when played through USB headphones
• Enhances compatibility of the Mac App Store with future software updates
• Adds support for media-free installation of Windows 10 Creators Update using Boot Camp

For more detailed information about this update, please visit: https://support.apple.com/kb/HT207706

Download macOS Sierra 10.12.4 Combo Update – The macOS Sierra 10.12.4 update improves the stability, compatibility, and security of your Mac, and is recommended for all users.

This update:

Thisupdate:

• Adds Night Shift for automatically shifting the colors in your display to the warmer end of the spectrum after dark
• Adds Siri support for cricket sports scores and statistics for Indian Premier League and International Cricket Council
• Adds Dictation support for Shanghainese
• Resolves several PDF rendering and annotation issues in Preview
• Improves the visibility of the subject line when using Conversation View in Mail
• Fixes an issue that may prevent content from appearing in Mail messages
• For more detailed information about this update, please

For moredetailed information about this update, please visit: https://support.apple.com/kb/HT207536

For detailed information about the security content of thisupdate, please visit: https://support.apple.com/kb/HT201222

Download macOS Sierra 10.12.1 Update – The macOS Sierra 10.12.1 update improves the stability, compatibility, and security of your Mac, and is recommended for all users.

This update:

• Adds an automatic smartalbum in Photos for Depth Effect images taken on iPhone 7 Plus
• Improves thecompatibility of Microsoft Office when using iCloud Desktop and Documents
• Fixes an issue that mayprevent Mail from updating when using a Microsoft Exchange account
• Fixes an issue thatcaused text to sometimes paste incorrectly when using Universal Clipboard
• Improves reliability ofAuto Unlock with Apple Watch
• Improves security and stability in Safari

For more detailed information about thisupdate, please visit: https://support.apple.com/kb/HT206174

Above are the five mature update for macOS Sierra DMG File which i provide a direct download links for that and explain about ever single update.

Bellow is a quick navigation download links for macOS Sierra DMG File

macOS Sierra 10.12 Direct Download Liks

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Related: Download macOS Mojave DMG File – macOS Mojave is the latest version of operating system from Apple for Mac Computer users. This version will run on Mac 2012 or later versions.