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Open DMG File on Mac OS

Since DMG is a native Mac OS disk image format opening DMG file is as easy as double clicking on it in Finder. When you open DMG file this way, disk image stored inside DMG file will be mounted, and then opened in a separate Finder window. If DMG contains installation of an application, then installation window of the app will open. If not, then you will see the disk image content. Even in case when disk image contains installation of the application you can still view contents of the mounted DMG file by clicking on its name in Finder Locations section or by selecting Go->Go to Folder… in Finder menu, typing /Volumes/ and clicking Go button.

Mount and unmount using Hdiutil

To mount a disk image using hdiutil you need to open terminal app and type following command there:

hdiutil mount example.dmg

To unmount type:

hdiutil unmount /Volumes/example

Where /Volumes/example is a path where disk image was mounted

Mount using DiskImageMounter.app

You can quickly mount DMG file by Control-Clicking on it and selecting Open With->DiskImageMounter.app. This will mount DMG file and its content will become available in Finder Locations and /Volumes folder.

Mount using Disk Utility

You can also mount DMG file using Disk Utility application available in Mac OS. Look for Disk Utility using Launcher and launch it. After that select File->Open Disk Image… in the main menu and choose DMG file you want to mount. After clicking Open you should see a screen like below where disk image details will be shown including used and free space, mount point, disk type and more.

You can also access disk image mounted by Disk Utility in Finder Locations or /Volumes folder.

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Once application located in the DMG file is installed it is safe to delete it since DMG file is only needed during the installation process.

Just tried this on my home machine running a webserver. Dragged an image to the Web folder and mounted it thru the Terminal over the internet just as you detailed.
(e.g. hdiutil mount 'http://www.mydomain.com/Image.dmg')
Very Cool

Wouldn't be very hard at all to make a Cocoa wrapper...I'll see if I get around to it today...Any ideas on how it should be designed (feature-wise and/or gui-wise)?

Select an URL in a Cocoa program. Go to the Services menu. Disk Copy. Mount Image. DC will launch and the disk image will be mounted remotely! That explains what that strange Service item was used for!

Since Services are only available in Cocoa apps, I think a general app that did this would still be quite useful. Drag-and-drop a URL onto the program, and that's basically it. Maybe when it's running there's a small 'well' onscreen where you can drag stuff, in addition to the usual drag to dock.
Maybe a list of recently visited .dmg files, too, to make going back easier.
Thoughts off the top of my head...
-rob.

The obvious question is, is it a good idea to mount a large update like this remotely and then run the updater from it or is that going to be worse/slower/use-more-bandwidth than just downloading the entire image and mounting it then?

It depends, really. It depends on how the programs you use on the files were written - if they keep files in memory or read them again or again. At the recent WWDC, Apple emphasized that developers should use the disk sparingly, as it could reside on a network with slow performance.
For most applications it probably doesn't matter. Its probably best to download the dmg if you are going to use most of its contents...I haven't done a lot of testing, so you may have to experiment some to find the optimal working pattern.

I just mounted a remote copy of the new QuickTime installer. Whee! I was able to examine the contents with Pacifist and SNAX, although examining them with the Terminal was much faster, including the VolumeCheck script. One use for this would be to quickly decide whether you wanted to download such a package at all (esp. if us are stuck with a dial-up connection). I was tempted to try running the installer, but I decided there was likely no faster road to spinning-beachball hell.
On a less successful note, when I try to mount a volume (even a local one) with the Disk Copy service, the classic version of Disk Copy is invoked, even though the correct application open it when it is double-clicked.

Couldn't get this to work for me. Running 10.1.5 on a Powerbook. Tried one of the examples at the Terminal command line and got:
hdid: unable to convert path to CFURL - error 0x000003E7 (999)
hdiutil: mount: mount failed (59136).
hdiutil: mount failed - unknown error (59136)
No idea what that all means.

Umm...never mind. I had a couple misplaced spaces in the imagename string.
Works fine now.

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Does hdiutil have a timeout? Is it trying to pull the update over and then mount it, or when I access something on the remote disk image does it access that remote server?
It worked fine with my iBook 500 (10.1.5, 320MB) on a LAN connected to the outside world via a T1.

It doesn't download the complete image. It access it in a random fashion, using resume/continue commands, i would guess. Which is why some servers will not be supported.

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Yes, the content is only partially retrieved: here's a sample HTTP request made by hdid:
GET /diskImaget/encrypted.dmg HTTP/1.1.
Host: 192.168.7.12:80.
Range: bytes=0-511.
There is also a side note not yet mentioned: if you mount an encrypted disk image remotely, the encryption is deciphered only after the partial retrieval, that is the data is secured during transmission. (At least that is what it looks like, based on analyzing the HTTP requests sent. I wish someone could confirm this.)
iv

i remember the Disk Utility in the services menu under 10.1.5 but it seems to be missing from the jaguar services menu. can anyone confirm this?
thx
ppmax

Not sure about Jaguar, but it sure ain't here under Panther.

comes up with the error 'does not appear to be a disk image: internal error'. Seems to be logical since Apple binhexed the the images. Is there an option in hdiutil which allows binhexing first before the image is remotely mounted?

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I managed to mount a .bin image...Hmm...

Alright, I've spent a few hours (literally) hacking up a GUI for this little trick. Its written in AppleScript Studio, so Quick n' Dirty is the name of the game. Regardless, it works and is customizable. Check it out at Remote Image Mounter.

This could be really great for an IT department that wanted to make disk images available to its clients. There are dozens of handy uses for this!

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I've administered Suns, and as a matter of fact we used NFS servers (Network File Systems) to remote mount users home directories. This way you could log in to any system in the company and see all your files.
We even remote mounted CDs, as several older Sun systems didn't come with CD-ROMs as standard.
Local UNIX accounts from what I've seen are a bit unusual in the business world.

Macs have been able to remotely mount volumes and CDs as well, but this is the first time we have seen remote mounting of disk _images_.

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URLs which start with 'disk://' automatically spawn Disk Copy to mount them over the internet. For an example, go check out WHAMB:
http://www.whamb.com
The download section offers you the option of downloading the disk image containing the software or mounting it over the internet. It seems that you just have to make sure it's an actual .dmg file (not .sit or .gz or any other compression applied), get the web download address, and replace 'http' with 'disk'.
And all without the command-line.
Disk Copy doesn't seem to honor the Proxy settings in the Network System Preferences unfortunately, so this doesn't work for me behind our firewall, but it all should in theory.