For example, say a DMG file isn't just storing compressed files like images and videos but is instead holding a software program. You can extract, or open, the DMG file in Windows using one of the programs mentioned below, but you can't actually execute the program and use it like you would another Windows application.
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.
- Jan 20, 2018 DMG is a disk image format for Mac just like an ISO file in Windows. That means, it is possible to mount a DMG file on a virtual disk or write it to a DVD and access its contents. A macOS installation package with DMG extension enables creating bootable installer DVDs.
- IMG to ISO is a free small software utility, as its name suggests, it can convert the IMG image files into the ISO image files. Disk Image formats. The IMG is an disk image file format, it be used by some virtual drive software, Its file extension is generally.img or.ima.
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. Install dmg windows 10. 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:
| 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
This year Apple has announced and released the new version of Mac called MacOS 10.15 Catalina. this operating system is new and it has tons of features like you can use SideCar feature to make iPad as a second screen display, and you can add iPad apps on the Mac. So, without this, it has many handy features. Therefore, I recommend you to install MacOS Catalina and get an experience of the latest Mac version, in this case, you need to download MacOS 10.15 Catalina dmg, VMDK, and Image file. SO, you will get all the download files in this article.
If you are Mac user then you can install MacOS Catalina on Hackintoshand on Mac computer but for Windows user, they have a good platform which allows them to install MacOS Catalina. to install Catalina on Windows you need to download and install virtualization software like Virtualboxand Vmware Workstation. this virtualization software is the best platform to install macOS Catalina on Windows. However, you can install macOS Catalina Public beta right now. Although there are many ways to install MacOS Catalina and I will give the link below where you can follow and install macOS Catalina.
Download MacOS 10.15 Catalina dmg, VMDK, and Image File
Windows user should remember that without MacOS Catalina dmg, VMDK, or Image file they can’t install MacOS Catalina on virtualization software although Mac user can install MacOS Catalina on Mac PC without downloading MacOS Catalina image file. However, you are using a virtual machine and for that, you have to download a virtual image then you can install any Mac operating system on virtualization software.
Table of Contents
Why Download MacOS Catalina Image file?
As I mentioned above that without image file you can’t install any Mac operating system on Virtualbox or Vmware, therefore, you are a windows user and you are using virtualization software, in this case, you will need to download whether dmg file, VMDK file or Image file.
Mac users will not need to download the MacOS Catalina image file because they can install Mac operating system easily on the Mac computer. but the Mac operating system is the best and interesting to use, therefore Windows users are curious to get the idea and install MacOS Catalina on Windows.
Therefore, I will give the dmg file, VMDK file, and Image file download link below and you can download it through google drive because the file is too large and I have put it on Google drive but you can download it from there easily.
Download MacOS 10.15 Catalina dmg, VMDK, and Image File
Here, I will give the download link one by one with the heading that you should not mix the download file. So, follow me and read the article attentively.
1. Download MacOS Catalina dmg File
Img Dmg 変換
If you download the MacOS Catalina dmg file from App Store then you might notice the file size is 6GB, it means, the original file size is 6GB and I will give you two download link. the first one you can download it in 5 parts but make sure you have a good network connection, if your internet is fast then I prefer you to download the full link. The download file is in Google drive and you know now google drive has limited the downloading but the below link will help you to download unlimited file size.
Img Dmg Difference
Download MacOS Catalina dmg file (5 parts):
- DownloadmacOS Catalina 10.15 Part 1 by Techbland (1.39 GB)
- MacOS Catalina 10.15 Part 2 by Techbland (1.39 GB) Download
- DownloadmacOS Catalina 10.15 Part 3 by Techbland (1.39 GB)
- MacOS Catalina 10.15 Part 4 by Techbland (1.39 GB) Download
- DownloadmacOS Catalina 10.15 Part 5 by Techbland (85.7 MB)
Download MacOS Catalina dmg File (One Drive):
- DownloadmacOS 10.15 Catalina DMG File(6.1 GB)
- DownloadmacOS 10.15 Catalina DMG File (One Drive)
Related Article: Download MacOS Catalina dmg File
2. Download MacOS Catalina VMDK File
You will need to download the MacOS Catalina VMDK file for a virtual machine in order to install MacOS Catalina on Virtualization software. as you know VMDK means Virtual Machine Disk Image, therefore, if you are Windows user and you want to install MacOS Catalina on Virtualbox or vmware then you have to download MacOS Catalina VMDK file.
Download MacOS Catalina VMDK File:
- MediaFire: DownloadLink (Direct Link)
Related Article:Download MacOS Catalina VMDK File
3. Download MacOS Catalina Image File
To install MacOS Catalina on Virtual Machine then you have to download the MacOS Catalina image file for Virtualbox and Vmware. However, to install macOS Catalina on Vmware is easy than Virtualbox because installing on Virtualbox you have to do some coding work but on Vmware, you don’t need that. Therefore, go with Vmware and enjoy MacOS Catalina.
Download MacOS Catalina Image file:
- DownloadmacOS Catalina 10.15 (One Full) Google Drive 1.
- DownloadmacOS Catalina 10.15 (One Full) MediaFire.
- DownloadmacOS Catalina 10.15 (6 of 6) Google Drive.
Related Article:Download MacOS Catalina Image file for Virtualbox and Vmware
Dmg To Img Windows
Install MacOS Catalina on Different Platforms
Once, you download the MacOS Catalina dmg, Vmdk, and Image file then now you want to install it on virtualization software or on your Mac computer. However, you can install MacOS Catalina on different platforms and I will give the links below.
If you are Mac user, then for sure you will install it on your Mac computer because a Mac user doesn’t need to install Virtualbox or Vmware, However, they can install it on Hackintosh or Mac PC. Therefore, download MacOS Catalina from the App Store and install it on your PC, to install MacOS Catalina on Hackintosh or Mac Computer then follow the below links.
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Convert Img To Dmg
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Conclusion
Dmg To Iso Image
That’s all about the MacOS Catalina Operating system and you have learned everything about MacOS Catalina installation and download file. So, what I think this article was helpful for you and if you have any question then feel free to ask me in the comment box.
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