Creating nice dmg “installer” for Mac OS X. Ask Question Asked 7 years. It shows step-by-step you how to create beautiful DMGs only by using iDMG (which is a free software), Finder and a terminal. Its quite easy. You might need to unmount the device and remount it by opening the DMG file to see the changes. Depending on what you put. Feb 06, 2013 Hey, I'm trying to open a DMG file on my mac. It's for a VPN so I could use it when I go abroad. Last time I used a VPN on my PC and it worked just fine, but now when I got my mac (which is about a month old as of today.yay!:)) I'm having trouble installing the VPN. I opened a DMG file.
Shortcuts, in Windows, are icons that point to some other file, program, or disk drive. Macs have a similar feature called an alias. You can create an alias by clicking the name or icon of the file, program, or disk volume you want to alias and then choosing Make Alias from the Finder’s File menu. The keyboard incantation for making aliases: Command+L.
Just as in Windows, the alias icon appears with a little arrow at its lower left, and you can move the alias anywhere you want. You can even move it to the Trash if you no longer need it; the original file won’t go away.
Mac OS X has one big improvement over this Windows feature, however. In Windows, if you move the original file to another folder or change its name, Windows gets unhappy and doesn’t know where to find the file anymore. OS X keeps track of where the file went and just does the right thing. Of course, if you delete the original file, there’s not much OS X can do.
Watch out for aliases when you want to copy files to another medium, such as an external hard drive, CD-R, or flash drive. If you drag an alias, only the alias gets copied, not the file. To copy the file or folder the alias points to, click the alias and choose File→Show Original or just type Command+R.
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.
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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.
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