Since DMG files are used predominately to install applications on Macs, you cannot properly open DMG files on Windows computers. Double-click the DMG file. This wikiHow teaches you how to open a DMG file on a Mac. DuPage Medical Group (DMG) was formed in 1999 when three healthcare groups serving the western suburbs of Chicago since the 1960s joined together. Today, DMG has grown into the largest and most successful independent multi-specialty physician groups in Illinois. This is list of different elevator fixtures that have been made by DMG. These buttons have curved rectangular buttons with illuminating halo and braille/tactile plate attached with the button. The button plate can be stainless steel with an illuminating symbol or black die-cast metal.
The icon represents an internal hard drive within a generic file icon. | |
Filename extension | .dmg, .smi, .img |
---|---|
Internet media type | application/x-apple-diskimage |
Uniform Type Identifier (UTI) | com.apple.disk-image |
Developed by | Apple Inc. |
Type of format | Disk image |
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. Vnc download free.
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.
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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]
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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:
Position(in Hex) | Length (in bytes) | Description |
---|---|---|
000 | 4 | Magic bytes ('koly'). |
004 | 4 | File version (current is 4) |
008 | 4 | The length of this header, in bytes. Should be 512. |
00C | 4 | Flags. |
010 | 8 | Unknown. |
018 | 8 | Data fork offset (usually 0, beginning of file) |
020 | 8 | Size of data fork (usually up to the XMLOffset, below) |
028 | 8 | Resource fork offset, if any |
030 | 8 | Resource fork length, if any |
038 | 4 | Segment number. Usually 1, may be 0 |
03C | 4 | Segment count. Usually 1, may be 0 |
040 | 16 | 128-bit GUID identifier of segment |
050 | 4 | Data fork checksum type |
054 | 4 | Data fork checksum size |
058 | 128 | Data fork checksum |
0D8 | 8 | Offset of XML property list in DMG, from beginning |
0E0 | 8 | Length of XML property list |
0E8 | 120 | Reserved bytes |
160 | 4 | Master checksum type |
164 | 4 | Master checksum size |
168 | 128 | Master checksum |
1E8 | 4 | Unknown, commonly 1 |
1EC | 8 | Size of DMG when expanded, in sectors |
1F4 | 12 | Reserved 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.
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]
- ^ abcdefg'hdiutil(1) Mac OS X Manual Page'. Archived from the original on 2016-05-14. Retrieved 2016-05-14.
- ^ ab'Mac OS X: Using Disk Copy disk image files'. Archived from the original on 2013-12-19. Retrieved 2013-04-25.
- ^
hdiutil(1)
– Darwin and macOS General Commands Manual - ^'Re: Some apps refuse to launch in 10.2.8! (OT, but very important)'. Archived from the original on 2014-01-17.
- ^'Guides'. Apple. Archived from the original on 2009-03-06. Retrieved 2010-10-27.
- ^'DART 1.5.3: Version Change History'. Archived from the original on 2013-12-19. Retrieved 2013-04-25.
- ^'Software Downloads: Formats and Common Error Messages'. Archived from the original on 2010-12-24. Retrieved 2009-05-06.
- ^'VileFault'. 2006-12-29. Archived from the original on 2007-01-09. Retrieved 2010-10-27.
- ^Michael Tsai (2015-10-07). 'LZFSE Disk Images in El Capitan'. Archived from the original on 2017-04-09. Retrieved 2017-04-09.
- ^'Demystifying the DMG File Format'. Archived from the original on 2013-03-17.
- ^'dmg2img'. Archived from the original on 29 November 2010. Retrieved 2010-10-27.
- ^'DMGExtractor'. Archived from the original on 2011-01-02. Retrieved 2011-01-03.
- ^MacDrive Features / Boot Camp / System Requirements /. 'MacDrive Home page'. Mediafour. Archived from the original on 4 October 2010. Retrieved 2010-10-27.
- ^Olivia Dehaviland (2015-03-03). 'Apple DMG Disk Image Viewer'. DataForensics.org. Archived from the original on 2015-04-02. Retrieved 2015-03-10.
- ^'How To Convert DMG To ISO in Windows, Linux & Mac'. Archived from the original on 2010-03-07.
- ^'Convert DMG To ISO using PowerISO'. Archived from the original on 2009-05-02. Retrieved 2009-02-15.
- ^'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'
If you are a Mac computer user who is planning to upgrade to the Download Yosemite DMG, you have come to the right place. We give you the relevant official download links to get your MacOS upgraded to the Yosemite DMG. If you are new to this update of the Mac operating system, you can’t just execute the upgrade without researching about the version. So here we have come for your help by giving you a complete review of the Download Yosemite DMG, so you can understand its features and functionality well by reading this article. So are you ready to upgrade your MacOS to the OS X Yosemite? Then let’s go for it.
Brief Introduction to Download Yosemite DMG
Download Yosemite DMG is the eleventh major version of the MacOS which serves as the graphical operating system to the Mac computers. This version was released to the public use on October 16, 2014, after launching on June 2, 2014, at WWDC 2014. The Apple Inc. has developed this version of MacOS by adding improvements to the previous MacOS version and by adding initializing features to the system. Although it may seem like a bit older version, people still use it on their Mac computer and it is still very famous among all the Apple device lovers. Mac users who are currently using the OS X Mavericks can upgrade their OS to the Download Yosemite DMG and the OS X 10.11 (El Capitan) users can downgrade the OS to the Yosemite as well.
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What is a DMG Image?
A DMG file, which is also known as a DMG image is a mountable disk image created for the Mac OS X. It has the raw block data normally compressed and sometimes encrypted. DMG files are often used to install OS X software that is downloaded from the internet to mount a virtual disk on the Mac PC when opened. The DMG files are specific for the Mac computers, not for the Windows computers. However, the Window Daemon Tools may be able to mount virtual drives from DMG images, and some other utilities may be able to convert DMG files to a Windows recognizable format. Long story short, the DMG files are mostly used for the Mac OS X software and Download Yosemite DMG is one of that software.
Versions of MacOS
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- Mac OS X 10.0 (Cheetah)
- Mac OS X 10.1 (Puma)
- Mac OS X 10.2 (Jaguar)
- Mac OS X 10.3 (Panther)
- Mac OS X 10.4 (Tiger)
- Mac OS X 10.5 (Leopard)
- Mac OS X 10.6 (Snow Leopard)
- Mac OS X 10.7 (Lion)
- OS X 10.8 (Mountain Lion)
- OS X 10.9 (Mavericks)
- OS X 10.10 (Download Yosemite DMG)
- OS X 10.11 (El Capitan)
- MacOS 10.12 (Sierra)
- MacOS 10.13 (High Sierra)
Features of Download Yosemite DMG
- The windows in this Mac OS update has a green ‘Zoom’ button to enter the full-screen of the windows. So you can enter full-screen instead of enlarging the windows size with this feature.
- The Safari has been added DuckDuckGo search engine and the ability to close the Safari tabs remotely by using an iDevice.
- The Download Yosemite DMG has a custom history clearing option for the Safari. You can use it to clear the history and cookies of the last hour, day or week.
- Some of the stock applications such as Safari and Mail has been updated in this Mac operating system version.
- The search box in the Spotlight feature now displays in the middle of the screen. It shows you the results from various online sources such as Bing, Maps, and Wikipedia.
- The Photos feature has been updated as the iPhoto and Aperture in the Download Yosemite DMG update. And you can use the iCloud photo library and upload the photos across the devices.
- The Notification Center has a ‘Today’ section which displays the information and the updates from various sources and widgets. This feature is similar to the iOS 8 ‘Today’ feature.
- The Continuity feature increases the integration with the other Apple services. So that you can make/ answer call and send/ receive messages, activate personal hotspot, and load items on the mobile apps in the Download Yosemite DMG update.
- The display of the Download Yosemite DMG is simple and thus, it is easy to use. It has dark and light color schemes, new icons, Lucida Grande with Helvetica Neue as the system typeface defaults.
Related Versions of Download Yosemite DMG
- OS X 10.10.5 Delta update 10.10.4 to 10.10.5 (1.02 GB)
- OS X 10.10.5 Combo update 10.10 to 10.10.5 (2.12 GB)
- OS X 10.10.4 Delta update 10.10.3 to 10.10.4 (1.09 GB)
- OS X 10.10.4 Combo update OS X 10.10.x to 10.10.4 (2.02 GB)
- OS X 10.10.3 Delta update 10.10.2 to 10.10.3 (1.52 GB)
- OS X 10.10.3 Combo update 10.10.x to 10.10.3 (2 GB)
- OS X 10.10.2 Delta update 10.10.1 to 10.10.2 (554.3 MB)
- OS X 10.10.2 Combo update 10.10.x to 10.10.2 (841.1 MB)
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Requirements to Download Yosemite DMG
- iMac – Mid 2007 or later
- MacBook – Aluminum Late 2008 and Early 2009 or later
- MacBook Pro – 13-inch, Mid-2009 or later; 15-inch, Mid/Late 2007 or later; 17-inch, Late 2007 or later
- MacBook Air – Late 2008 or later
- Mac Mini – Early 2009 or later
- Mac Pro – Early 2008 or later
- Xserve – Early 2009
- MacBook Air – Mid 2012 or later
- MacBook Pro – Mid 2012 or later
- iMac – Late 2012 or later
- Mac Mini – Late 2012 or later
- Mac Pro – Late 2013