How Do I Mount A Dmg File On Mac
DMG is Apple’s proprietary disk image format, native to Mac OS X. There are actually a whole bunch of different types, format and options within this format. There are options for encryption, compression, and different kinds of partition schemes, among others. Unfortunately, this can make things pretty confusing.
So you’re running Linux on your computer, maybe Ubuntu, and you have some files with the .dmg extension. In this guide, we’re going to talk about how to open, mount, extract, and otherwise get your files from these pesky DMG images. You could always just extract the files on a Mac, then transfer them back to your Linux machine. But if you really want to do this on Linux, without having to rely on Mac, here’s how to do it.
To mount/manipulate the DMG without conversion, you could use HFSExplorer. It comes as freeware, and has a decent set of options and features. Since your working on Windows 7, 7-Zip is the only other option I see for your situation. Either way, however, it appears as though you would have to perform some form. As a matter of fact, I do the opposite process frequently to take an ISO or EXE file from my Mac to my Windows computer at work. All you do is drag the file to the CD and then burn the CD. Use Universal Disk Format for the CD. Macs can mount a UDF CD fine. You don't need to mount the image or convert it to any other format.
What are DMG image files?
Simply put, it’s a kind of image file. But not an image like a jpeg is an image. DMG is Apple’s proprietary disk image format, native to Mac OS X. There are actually a whole bunch of different types, format and options within this format. There are options for encryption, compression, and different kinds of partition schemes, among others. Unfortunately, this can make things pretty confusing when we’re trying to gain access to the data contained in one of these images.
DMG images are typically a kind of Universal Disk Image Format (UDIF), although there are others, namely NDIF and SPARSE. Although the .dmg file extension is usually used, they can also sometimes have an .img extension, or in some cases no extension at all. Their MIME type is application/x-apple-diskimage.
The HFS/HFS+ (Mac OS Extended/Journaled) file system is typically used in DMGs. However, this isn’t always the case. You may also sometimes find FAT and ExFAT files systems, as well as variations on HFS.
Does my system support DMG?
Perhaps the biggest hurdle to overcome when trying to work with DMG files is working with the HFS file system (Mac OS Extended). Linux supports HFS through the “hfs” and “hfsplus” kernel modules.
There’s an easy way to test if your system has these kernel modules. Plug in a USB drive formatted with the Mac OS Extended file system. If your particular distribution doesn’t have the appropriate modules, you will likely get an error message. On Ubuntu, you’ll get a popup window declaring “Ubuntu: Unable to mount
Alternatively, we can see if the kernel module files are present with find:
We want to see two files: “hfs.ko” and “hfsplus.ko”. If find doesn’t return these files, your system probably doesn’t support HFS.
You could also try “modinfo”: modinfo hfs and modinfo hfsplus should return something like:
If you get 'modinfo: ERROR: Module hfsplus not found' your system doesn’t have these modules.
Not all Linux kernels and distributions support HFS. This is especially the case for certain distributions that are a few years old. If you have kernel support for HFS, great! If not, don’t worry. There are still ways to extract data from your DMG files. While it’s nice to have the option to mount the images we’re working with, this is really the only functionality we’re losing without having the hfs and hfsplus modules. The two programs we’re going to use later on (P7ZIP and dmg2img) do not require kernel support to function.
What kinds of DMG images can be opened in Linux?
This guide is about how to open, mount, and extract files from read/write, read only, and compressed DMG image files. The following partition schemes have all been tested with the techniques discussed here.
- Apple Partition Map
- CD/DVD (partitioned)
- CD/DVD (partitioned) with ISO data
- Hard disk
- Master Boot Record Partition Map
- No partition map
This guide does not cover how to handle sparse disk images (.sparseimage), sparse bundle disk images (.sparsebundle), or CD/DVD masters. DMG images with partition scheme types of “CD/DVD” and “GUID Partition Map” do not appear to work with the techniques described here.
Option 1: Mount the DMG
If the Linux distribution you’re on has HFS support in the kernel (Ubuntu 14.04.1 LTS supports it), it’s pretty easy to just mount the DMG image:
We’re using “sudo” because we need root privileges to mount things. The HFS+ file system type is specified with “-t hfsplus”. The “/mnt” at the end of the command specifies where we’re mounting the image.
Unmount the image with sudo umount /mnt
If you get a wrong fs type message like the one below, it means the DMG file is either of an unsupported type, or it’s compressed. Unsupported images include sparse images, sparse disk bundles, CD/DVD masters, and images with partition schemes of the CD/DVD or GUID Partition Map types.
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Use “file” to learn a little more about the image file:
How Do You Mount Dmg File On Mac
If you get image.dmg: x86boot sector that means it’s probably using a GUID Partition Map and isn’t supported. This isn’t good, however, it’s also not too terribly common.
How To Mount Dmg File
What’s more common is to see something like this:
If mounting isn’t working, and this is what you’re seeing with “file image.dmg”, then you’re luck!. Our problems are being caused by compression. Linux doesn’t like to mount compressed DMG images. To get around this little obstacle, we’ll use dmg2img (see below).
Option 2: Use dmg2img for compressed images
So you have a DMG image that you can’t mount because it’s compressed. You’ve done “file compressed_image.dmg” and you got “compressed_image.dmg: bzip2 compressed data”. The fix? That’s easy: use dmg2img to convert it to an uncompressed image. Once you run the image through dmg2img you should be able to mount it no problem.
Don’t have dmg2img? It’s usually pretty easy to get using your distribution’s package management. On Ubuntu, you’d do:
Using dmg2img isn’t very difficult. Type “dmg2img” into the command line followed by the name of the DMG file you want to decompress. The Mac OS X version of Firefox is a good example of a compressed DMG file.
Now mount the resulting .img file:
Option 3: Extract DMG contents with P7ZIP
P7ZIP is awesome. It’s the Linux/BSD version of 7-Zip. Check out their SourceForge page here With it you can literally extract files from any kind of image or archive. Just kidding… It doesn’t really work with every format conceivable. However, it can handle (in alphabetical order): ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR and Z. Impressed? I certainly am!
Installing p7zip is pretty easy using your distribution’s package management system. On Ubuntu with apt-get:
In addition to being able to extract data from compressed and uncompressed images alike, P7ZIP doesn’t require the HFS kernel modules at all. In the example below, we’re going to extract all of the files from “Firefox 33.1.1.dmg”. When we’re done, we’ll have a tidy little folder called “Firefox”.
Invoke P7ZIP to extract archives and images with “7z x”.
Notice that 7z extracted three files: “0.ddm”, “1.Apple_partition_map”, and “2.hfs”. To actually get to the files, we’ll need to run 7z again on “2.hfs”.
We picked “2.hfs” because it was the biggest of the three, meaning it was probably the one with the data. Simple but effective logic. After a few moments, you should have a folder called “Firefox” with all of the files from the original DMG.
In this blog, we will discuss that how can we mount DMG in Windows. But, before going further first we have to know about a DMG file in brief.
Mac OS X Disk image file can access DMG file extension, which is a digital reconstruction of a physical disc. DMG is generally a type of file format which is used to store compressed software installers and to avoid the usage of the physical disc. The earlier versions of Mac other than OS X 9 support Disk Image files, whereas Mac previous version uses IMG File format. DMG files can be easily accessed with the help of Mac but the main challenge is to open Mac .dmg in windows as sometimes at workplace there is a need to mount DMG in Windows.
Need to Mount DMG in Windows
DMG files are Mac OSX Disk Image files. As they are Mac installation files and the users cannot install these programs on Windows. So, to read a Mac DMG file in Windows we have to download Windows version of the program with the .exe file extension. Without Windows, we cannot go through the files in DMG format. Therefore, sometimes this can become the major issue for a user to convert/ extract DMG in Windows.
The need for the conversion would be more clear from the below queries taken from some forums:
Query 1:
I was using Mac operating system in my workplace from a long time and now I am switching from Mac to Windows. I do not know how I access my data in Windows. Someone has suggested to Mount .dmg to Windows format. Is there any method for it?
Query 2:
I have copied DMG files on Windows but the icon is not visible properly and I cannot access my files on Windows due to some error. What to do now? I need to open the .dmg file in Windows 7 urgently.
Query 3:
Is there any manual way or a software to read a Mac DMG file in windows? As one of my friends has an orphan DMG file having some official information and he needs to access that .dmg file urgently. Can anyone help?
Query 4:
I have a Disk Image file and I have to send the data after adding some more information to it. But, I am not able to open it. Can anyone please suggest how to read the .dmg file in windows 7?
Methods to Mount DMG in Windows
There are two ways to view DMG files in Windows as mentioned below:
Solution 1. Convert DMG Files to ISO
In this method, you need to execute a simple command in Command Prompt by following the systematic steps and can run .dmg on windows:
Step 1: Firstly, you need to download dmg2img zip file.
Step 2: When the downloading part is done extract data from dmg2img to a new folder.
Step 3: Now, hold down the Shift key on the keyboard then do a right-click on the new folder and click on open command window here.
Step 4: After all these steps now, you need to execute this command mentioned below.
dmg2img and click enter. (Here in the mentioned command replace it with the path to the DMG file that you want to convert to ISO and with the position that you want to give to converted file).
Solution 2. With the Help of DMG Viewer
There is a software namely DMG viewer that open Mac .dmg in windows and view all the Disk Image files on windows operating system. The application is designed in such a way that it only needs DMG files to view the data by following mentioned steps.
Step 1: After downloading, open the application on your system.
Step 2: Click on the Scan button to add single or multiple .dmg files.
Step 3: Now, you can see two options on the screen select any as per the need. If you want to view all the files select on All and if not select the file type. After this, select mode file or folder.
Step 4: There you can see the option of select mode, which has two options one is file and other is the folder. You can select any of them as per your requirement. If you select the file it will add a single file at once in file mode and if you select a folder it will add multiple DMG files at once.
Step 5: Click on the browse button to locate DMG files from the system and to add them.
Step 6: Select a .dmg file and click on Open button.
Step 7: Now, click on the preview hyperlink to preview individual email.
Step 8: You can have a detailed view of the emails with the help of different tab offered by the preview window.
Step 9: Click on search option to look for text, images, and emails in the selected folder.
Step 10: Select the folder and then type the extension of the file you are looking for. To begin this you need to click on Search button. As shown below the given fig.
Step 11: Now, Click on save button to extract the selected data.
Step 12: Select the destination where you want to save the extracted data. Make a new folder or select an existing folder to create a new folder for extraction.
Step 13: Once export all the files verify output at the destination location.
Conclusion
As we have discussed in the above blog, the need to open the Mac DMG file in Windows with some of the user queries. As sometimes the user needs to mount DMG in windows and faces some problems while doing that, so we have also mentioned the ways to open the .dmg file in windows. These methods can be easily utilized by the user accordingly.