Dmg Disk Image

A.dmg file is a disk image, meaning it's an exact copy (raw block DATA) of a disk (CD, DVD, USB stick, etc.) or even just a folder wrapped in a disk image. DMG images have been the default file format for distributing software on the internet for Mac OS X users since the year 2000. A dmg file extension is used for default disk image format in Mac OS X (macOS) that replaced the older IMG format. It is used much like ISO images on Windows platform. It is used much like ISO images on Windows platform.

Convert DMG to ISO File

A .DMG file is the disc image file used by MAC OSX. It is an exact copy of a hard disk or compact disk. The DMG file can be burned to a CD or mount as a normal volume on Macintosh computers. Usually, the data in DMG file is stored in compressed format. On a Windows PC, AnyBurn can convert DMG file to ISO format, or burn it to a blank CD / DVD disc. To convert DMG file to ISO format, please follow the steps,

Dmg Disk Image

1. Run AnyBurn, and click 'Convert image files'.

Dmg Disk Image Mac

2. Select the source DMG file, and select the destination image file type to ISO format. Anyburn will create the default destination image file name based on the destination image type. The destination ISO file will be in the same folder of the source DMG file, you can change it if necessary. After you have made the selection, click 'Convert Now' to start conversion.

3. AnyBurn will start converting the DMG file to ISO format, and showing the conversion progress.

4. You should see the message 'Converting image file finished successfully.' when the conversion complete.

What is a .dmg file?

A .dmg file is a disk image, meaning it's an exact copy (raw block DATA) of a disk (CD, DVD, USB stick, etc..) or even just a folder wrapped in a disk image. DMG images have been the default file format for distributing software on the internet for Mac OS X users since the year 2000. DMG images are safe to store on any partition type, such as Windows (NTFS) and are safe to distribute over FTP, send by email, etc.. as opposed to the previous default Mac OS disk image format DiskCopy which totally unsafe to copy over anything else than a HFS (Mac) partition. DiskCopy allowed for compression, which is still the case for DMG images but the latter also allows for encryption.. which proves to be a double-sided sword when comes to universal support, especially under Mac OS 9. That is precisely why you should consider making CDR images instead to preserve Mac OS 9 and earlier disk images.

How to use or extract DMG images contents?

DMG images are mountable and burnable/clonable onto real media under any Mac OS X version. You can also browse and extract specific files from DMG images using small shareware utilities such as PowerISO. Mounting a .dmg file makes a new drive appear on your Mac OS X computer, effectively letting you use it as if you had the original media inserted (e.g. a CD-ROM).

DMG images can also be attached to some emulators but they are not universally supported so you might end up having to convert your DMG image to an ISO image in order to attach it to an emulator or to mount it under your OS (unless it's Mac OS X). Note that PowerISO (under Windows or Mac OS X) does that conversion for you in just 2 mouse clicks under a few seconds.

-- How to burn/clone disk images onto USB sticks super easily under Windows and under Mac OS X

Under Classic Mac OS (before Mac OS X)

If the DMG image is compressed and/or encrypted, there is no way to mount it under Mac OS 9 and earlier.

Mac OS 8.5 to 9.2.2: For non compressed, non encrypted DMG images, try Toast 5 Titanium

Under Mac OS X

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Simply double click the DMG image and it will mount on your desktop. Alternatively, use Disk Utility bundled with every Mac OS X environment: Launch Disk Utility > FILE menu > Open disk image..

Under Windows

Open it using PowerISO