Resize DMG Files. Right click DMG File Click Get Info (View the original size). Open Disk Utility Select Images TabClick on ResizeSelect the DMG file to be resized. Click on Open Type the file size to be reducedSelect ResizeDone; In Windows: Originally, DMG files are the default Disk Image file for Mac.
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What do you get when you make a digital copy of a disc? You get a disc image. But depending on the operating system you’re using, the disc can come in two common extensions: DMG or ISO. But how do you even open a DMG file if you’re using Windows? Is it possible? Yes, it is and here’s how, but first, let’s break down both extensions a bit further for a better understanding.
What is a DMG File?
For those of you familiar with an ISO file, a Windows-based disk image file, then you’ll have no problem understanding a DMG file, the mirror image of ISO files for Mac OS.
If you want to install a program to your Mac OS, rather than use an ISO file, you would use a DMG file instead. Both an ISO and DMG file are filled with all the necessary installation files, like the installation wizard, to install a program to your computer, whether it’s Windows or Mac OS. You’ll also see these a lot with compressed files.
Of course, if a DMG file is only supported by Mac OS then a Windows PC isn’t going to be able to open it. However, you do have the option to, at the very least, view the files contained within a DMG file if you’re using a Windows PC.
Opening a DMG File in Windows
The problem with trying to execute a DMG file in Windows is, if it’s a program, you can’t actually run the program and install the program inside; it’s unique to Mac OS. However, on the other hand, because a DMG file can also be a simple compressed file, any kind of images and videos contained within can still be opened.
But before you can do any of that, you’ll need a program that can actually do the job. Both PeaZip and 7-Zip can do the job for you. They’re free to download and, unlike a DMG file, these can be opened and installed on your Windows OS.
1. Install PeaZip or install 7-Zip by opening the executable you downloaded from their websites.
2. Find the DMG file you want to open and right click on it. Doing so will open a menu full of settings and various options.
3. Now, depending on the program you installed–PeaZip or 7-Zip–then you’ll either click Extract All… or hover over 7-Zip, which will open a submenu, then click Extract files… or, alternatively, you can click Open Archive if you just want to see if the files are worth extracting.
4. If you want to extract, then continue with the extraction by choosing a location to extract the files to, preferably in a location that’s easy to reach. Then click OK.
5. After a few moments, depending on the size of the compressed file, you’ll find the extracted files in the location you chose in the previous step.
Bottom Line
As you may have realized already, it’s pretty easy to open a DMG file on a Windows. Unfortunately, you just can’t execute any kind of program files that a DMG file may contain. However, if the compressed file contains any pictures or videos, then you’ll have no problem viewing those specifically, provided you have a media playback program that can play the extension.
With that being said, with the right tools, you can convert DMG files into ISO, but it depends entirely on the files. Once it’s converted to ISO, you can make an attempt at mounting the ISO to Windows with the appropriate program.
In computing world, DMG or (Disk Image File) is a file extension that belongs to Mac OS X. DMG file can also be termed as Apple Disk Image. The icon used equivalent to this file is an Internal Hard-drive. Disk Images are generally used worldwide in-order to distribute applications and software across the Internet. DMG file provides some attractive features that allow securing password along with file compression.
These virtual or physical Apple disks can be cloned from one to another. This is one of the powerful features of Mac.
Tip: If you want to open and view DMG files of Apple Mac OS X so, you can try DMG Viewer tool.
Why DMG Files Are Created?
Earlier, Mac applications made use of Resource fork. These are the part of file system on Mac Operating System, which consists of both the structured data and non-structured data. Mac could not transfer these Resource forks over the mixed networks. Hence, the usage of Resource fork dwindled and this was the reason that Apple created disk image formats(DMG). The Resource forks are very important as they contain Meta data regarding the file.
Mounting and Dismounting on Mac OS
It is equivalent to plugging in a removable drive, where E drive is automatically created and while removing one chooses ‘Safely Remove Device’. Similarly, you have to eject the Mac drive for both the virtual and physical.
Two Disk Formats supported are:
- NDIF
This was previously used as the default format of Mac, also known as New Disk Format. These files generally have an .img file extension. - UDIF
The native disk format of Apple Mac DMG file is UDIF (Universal Disk Image Format) with a file extension of .dmg.
MIME Type of DMG File:
application/x-apple-diskimage.
Supported File Systems
- Hierarchical File System (HFS) – This was developed by Apple Inc. for the systems supporting Mac OS. Earlier, these file systems were used in floppy disks and hard disks but later were used to read CD-ROM as well. It is known as Mac OS Standard.
- HFS Plus – It was developed after HFS, which is an extension of the same. It is known as Mac OS Extended.
- File Allocation Table (FAT) – It is a file system generally compatible with all file systems and helps in exchange of data between systems.
- ISO9960 – This is also a file system which was issued by ISO (International Organization for Standard) supporting various OS and helps in exchange of data.
- Universal Disk Format –This is a file system usually used to store broadcast media like DVD and optical disk formats.
How to Open DMG Files?
In Mac:
- When you download a Disk image, all the applications in it must be copied to the Application files, because many of these files will be in read-only format. Running these files inside the drives may produce some erroneous results.
- Double clicking the DMG File will open the file and you can view the contents in it. It might be images, documents, programs, etc.
- The DMG File consists of an application file. You can simply drag and drop to install them. If there is a possibility of having an installer, you can run these files instead of installing.
- Right-click on the File >> “Eject” (click on virtual disk instead of, original file)
Delete the old DMG Files after installing. The reason is old files may take more space when we install new programs.
Resize DMG Files
- Right click DMG File >> Click Get Info (View the original size).
- Open Disk Utility >>Select Images Tab>Click on Resize>>Select the DMG file to be resized.
- Click on Open >>Type the file size to be reduced>>Select Resize>>Done
In Windows:
Originally, DMG files are the default Disk Image file for Mac. Hence, they can be opened only on Mac OS.
Since there are no manual methods available to view the DMG Files in Windows, users can install external third-party software available online on Internet. DMG Viewer is one of the tools from such category.
The software provides you with the following features:
How To Get Rid Of Dmg Files On Mac
- Open DMG File in Windows OS based machine
- Read: Corrupt, Password Protected & Encrypted DMG
- Recover permanently deleted files from DMG
- Search a specific file type in large DMG Format Files
Conclusion
What Is A Dmg File Type
Considering the ongoing necessity to view DMG files, we have described a manual process to let the users understand how to open & view DMG files. Else, users can take the help of a reliable third-party tool named as DMG Viewer. It is the best application that helps to read .dmg files in Windows OS. Users can use any approach as per their choice.