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62 votes
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hdiutil: compact failed – Function not implemented

The error message is pretty unclear, but one reason might be that you are not connected to the power outlet. Compacting a disk image might be a long and intensive task, and sometimes the OS denies it ...
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  • 1,396
44 votes
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How can I convert a DMG to ISO on Mac OS X (preferably for free)?

You can use hdiutil to convert from .dmg to .iso directly: $ hdiutil makehybrid -iso -joliet -o [filename].iso [filename].dmg Renaming .cdr to .iso is bad advice! An .iso has a slightly different ...
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37 votes
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Why do we install software via `.dmg` files?

DMGs have a few key features which make them superior to plain old zips They’re a full file system (meaning they can store file permissions, have custom folder backgrounds, etc) They support “...
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  • 1,404
37 votes

How can I place .dmg files away from the desktop?

What you're seeing is the mounted disk image, you need to eject them. These are no different than a USB disk or flash drive that you attach or a CD/DVD media that you load into a drive. It will show ...
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  • 81k
29 votes

How can I place .dmg files away from the desktop?

If you want to eject the mounted DMG, please see Allan's excellent answer - or more simply do a secondary click on the DMG icon and select the Eject option. However, if you want to keep the DMG ...
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  • 6,179
25 votes
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Can't remove "Install macOS High Sierra.app"

I was experiencing this problem after downloading High Sierra to fix a friend's Mac. I found Rick's solution worked for me, but I've added a few more steps. Click the  symbol in the Menu bar. Click ...
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  • 282
20 votes
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Download macOS Installer.dmg file

Download on the first machine. When complete, the Installer will auto-launch. Quit it. The Installer is in /Applications/ and has the name Install macOS Sierra. [BTW it's not a .dmg, but an ....
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  • 97.3k
20 votes

Why are some Mac apps not available on AppStore?

Business Reasons On macOS, applications can be sold outside of Apple's Mac App Store. Many developers choose to sell their software through Apple's store in order to access the audience Apple ...
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  • 39.9k
16 votes
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Why are some Mac apps not available on AppStore?

There are a number of reasons developers may not want to go through the Mac App Store: Apple Developer account is required with paid annual subscription of $99 Apple review process may block certain ...
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  • 286
15 votes

OS X El Capitan suddenly can't open DMG files

I had the same problem, and managed to open .dmg files by going into Disk Utility>File>Open Disk Image. Once opened in Disk Utility, Double Click (Right Click) the icon and click show in Finder. Then ...
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15 votes

How do I skip verification of a .dmg file?

The command line tools allow you to mount the DMG and skip verification. Open Terminal: hdiutil attach -noverify /Path/To/Your/DMGFile.dmg If you have the DMG file on your Desktop, and the DMG was ...
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14 votes

Can't remove "Install macOS High Sierra.app"

Fastest way to fix this is the following. Reboot Hold Cmd + R Choose language If you are using an encrypted disk, select "disk utility" then select the disk where the unremovable files are located, ...
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  • 141
13 votes

Is there a command to install a dmg

If you want to script the install it requires a few more steps since the name of the .dmg file, the name of the Volume created, the name of the application, and the name of the device that needs to be ...
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13 votes

Is there a command to install a dmg

I had to mount and copy the .app to /Applications folder. For Etcher.app: First as @trojanfoe said : sudo hdiutil attach /Users/janatac/Etcher-1.2.1.dmg Then sudo cp -R /Volumes/Etcher\ 1.2.1/...
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  • 231
12 votes

How do I create a DMG file from a directory?

On Yosemite this did it for me too. Add this function to ~/.bash_profile: dmg(){ hdiutil create -fs HFS+ -srcfolder "$1" -volname "$2" "$2.dmg" } Usage in Terminal: ...
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  • 262
11 votes

How do I install a .dmg file without being a sudo user?

.dmg is not an app, it is a disk image. If you double-click the file, it should mount a virtual disk in the Finder. From there, you will be able to drag and drop the image into your applications ...
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  • 305
10 votes

Install Ghostscript on OS X 10.9 using DMG file

The program homebrew worked for me on Mac OS10.9.5: Type the following in the command line: brew install ghostscript
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  • 101
10 votes

How to change password of the .sparseimage encrypted image on El Capitan?

Option 1: Disk Utility In Disk Utility: select the image in the sidebar, then File → Change Password... (You must unmount the image before you can reset it). Option 2: Terminal In Terminal: hdiutil ...
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9 votes
Accepted

Do I have to keep the .dmg files on my computer?

A lot of applications (bundles) for OS X don't need an installer in contrary to almost all Windows apps. They are distributed inside an .dmg. To properly "install" them just open the .dmg and copy ...
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  • 63.7k
9 votes

Can't remove "Install macOS High Sierra.app"

I have found another solution in case rebooting in Recovery mode is not an option for you. Move the offending Mac OS X installer back from Trashes to Applications Re-download respective installer (e. ...
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  • 191
8 votes
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MacOS dmg file question

A DMG file (Apple Disk Image) is a disk image file that is mounted as a volume, just like a physical disk. They can be password protected and compressed (like ZIPs), and are usually used for packaging ...
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  • 1,842
8 votes
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Is running an app directly after opening .dmg file without installation safer than installing it?

Open the .dmg file (basically mount it), double click the app to launch it directly. Drag it to somewhere else (user space folder) other than the default Applications folder which requires root ...
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  • 39.9k
7 votes
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Installing OS X Yosemite from compressed DMG file in VMware Fusion

It doesn't matter what type the DMG is as VMware Fusion cannot install OS X Yosemite by booting it or even booting the Install OS X Yosemite.app downloaded from Apple as that's not how it works in ...
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7 votes
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Do files copied to an encrypted disk image (dmg) encrypt themselves?

It depends on your viewpoint: a file written to an encrypted disk image is immediately written encrypted to the HDD/SSD where the disk image resides. Since the file system of the unlocked disk image ...
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  • 63.7k
7 votes
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Can I delete the .dmg files on my Mac once I install the app?

Yes. You can safely delete .dmg files. A disk image file (.dmg) is simply an easy, portable structure to transfer an app to you without falling afoul of any internet 'oddities' such as compression, ...
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  • 97.3k
6 votes
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What are the differences between Dreamweaver_14_LS20.dmg and Dreamweaver_13_LS20.dmg?

Dreamweaver CC came in two major versions: the initial CC release (v13) and the CC 2014 release (v14). From the file names, you can infer which is which. As for a "full installer", there is no such ...
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  • 880
6 votes
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How to open .dmg file or install XCode on Windows?

You can not install XCode on any version of Windows, it only runs on OS X.
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  • 84.4k
6 votes
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Changing icon of a mounted disk image

The, e.g., osxfuse-2.8.2.dmg disk image file uses a hidden .icns file named .VolumeIcon.icns in the root of the volume and has the Custom Icon attribute set, probably using /usr/bin/SetFile. E.g.: ...
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6 votes
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Create dmg file on macOS 10.14 that can be opened on macOS 10.11

If the source folder is in a APFS volume, then by default a APFS volume will be created in the dmg file. This type of volume can not be read by El Capitan. The solution would be to create a dmg file ...
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6 votes

Can I see all locations that a DMG file install files to?

A DMG (Disk Image) file is like a zip file. It's compressed and has a check built-in to check if the integrity of the app is intact. Once you open a DMG file, in most cases, you just have to drag/drop ...
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