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. New Disk Image Format (NDIF) was the previous default disk image format in Mac OS 9, and disk images with this format generally have a.img. Sep 22, 2018 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.
So youâre running Linux on your computer, maybe Ubuntu, and you have some files with the .dmg extension. In this guide, weâre 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, hereâs how to do it.
What are DMG image files?
Simply put, itâs a kind of image file. But not an image like a jpeg is an image. DMG is Appleâs 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 weâre 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 isnât 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 âhfsâ and âhfsplusâ kernel modules.
Thereâs 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 doesnât have the appropriate modules, you will likely get an error message. On Ubuntu, youâll get a popup window declaring âUbuntu: Unable to mount '.
Alternatively, we can see if the kernel module files are present with find:
We want to see two files: âhfs.koâ and âhfsplus.koâ. If find doesnât return these files, your system probably doesnât support HFS.
You could also try âmodinfoâ:
modinfo hfs and modinfo hfsplus should return something like:
If you get '
modinfo: ERROR: Module hfsplus not found ' your system doesnât 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, donât worry. There are still ways to extract data from your DMG files. While itâs nice to have the option to mount the images weâre working with, this is really the only functionality weâre losing without having the hfs and hfsplus modules. The two programs weâre 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.
Open Dmg On Mac
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 âCD/DVDâ and âGUID Partition Mapâ do not appear to work with the techniques described here.
Option 1: Mount the DMG
If the Linux distribution youâre on has HFS support in the kernel (Ubuntu 14.04.1 LTS supports it), itâs pretty easy to just mount the DMG image:
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Weâre using âsudoâ because we need root privileges to mount things. The HFS+ file system type is specified with â-t hfsplusâ. The â/mntâ at the end of the command specifies where weâre mounting the image.
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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 itâs 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.
Use âfileâ to learn a little more about the image file:
If you get
image.dmg: x86boot sector that means itâs probably using a GUID Partition Map and isnât supported. This isnât good, however, itâs also not too terribly common.
Whatâs more common is to see something like this:
If mounting isnât working, and this is what youâre seeing with âfile image.dmgâ, then youâre luck!. Our problems are being caused by compression. Linux doesnât like to mount compressed DMG images. To get around this little obstacle, weâll use dmg2img (see below).
Option 2: Use dmg2img for compressed images
So you have a DMG image that you canât mount because itâs compressed. Youâve done âfile compressed_image.dmgâ and you got âcompressed_image.dmg: bzip2 compressed dataâ. The fix? Thatâs 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.
Donât have dmg2img? Itâs usually pretty easy to get using your distributionâs package management. On Ubuntu, youâd do:
Using dmg2img isnât very difficult. Type âdmg2imgâ 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.
https://gryxnn.weebly.com/mac-cleaner-application.html. Now mount the resulting .img file:
Option 3: Extract DMG contents with P7ZIP
P7ZIP is awesome. Itâs 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 doesnât 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 distributionâs package management system. On Ubuntu with apt-get:
In addition to being able to extract data from compressed and uncompressed images alike, P7ZIP doesnât require the HFS kernel modules at all. In the example below, weâre going to extract all of the files from âFirefox 33.1.1.dmgâ. When weâre done, weâll have a tidy little folder called âFirefoxâ.
https://gryxnn.weebly.com/blog/mac-os-x-moutain-lion-dmg. Invoke P7ZIP to extract archives and images with â7z xâ.
Burn Mac Dmg On Windows
Notice that 7z extracted three files: â0.ddmâ, â1.Apple_partition_mapâ, and â2.hfsâ. To actually get to the files, weâll need to run 7z again on â2.hfsâ.
We picked â2.hfsâ 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 âFirefoxâ with all of the files from the original DMG.
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