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Apple Disk iMaGe file format

3 votes
Accepted

Why do downloaded applications arrive as .dmg files

.dmg files are self-checking, unlike .zip files & so are less likely to error on opening. … dmg can also execute & mount to the desktop as a disk, which would need 3rd party software to do the same for a zip. …
Tetsujin's user avatar
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20 votes
Accepted

Download macOS Installer.dmg file

[BTW it's not a .dmg, but an .app file] Copy it to a safe place; after install it will be auto-deleted from Applications. The copy can then be used on any other machine. …
Tetsujin's user avatar
  • 118k
24 votes
Accepted

Auto-Launch app from the dmg

No. This in its most general application would be an egregious security risk. There is a provision to display a license prompt at mount time, however. btw, Windows auto-run [as opposed to auto-play] …
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0 votes

Strange Disk Image File (.dmg) problem - deleted files in xyz.dmg do not relinquish file space

If you start with an empty Trash bin, then you can see this in operation more easily. you can see items appear & disappear as you mount/unmount the dmg. …
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2 votes
Accepted

Opening a DMG file and switching to it automatically

Not all .dmg files open immediately to show their content in Finder [I think it depends entirely on whether they were open or not at creation/last Save], so if they don't, you need to have your Finder …
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2 votes
Accepted

When installing an application is there any way to avoid any drag and drop?

It will stay in the paste buffer so long as the .dmg is still mounted, unless overwritten by another copy action. … Frankly, it would be far more effort than it's worth to try automate that process, for any given .dmg with random content. …
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  • 118k
8 votes
Accepted

Can I delete the .dmg files on my Mac once I install the app?

You can safely delete .dmg files. … Incomplete installation - some people run apps out of a DMG and don’t install the app drag and drop. In this case, put the dmg in the trash but don’t empty it. …
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3 votes

DMG Equivalent on Windows

For Windows 7 & earlier, software is available to mount ISOs as though they were mounted CD/DVDs, but it requires the user to already be prepared for this. I've previously used MagicISO quite successf …
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1 vote
Accepted

how do I launch firefox after installing it?

Either way, you need to drag the actual Firefox app [Application, though the .app is hidden by the system, like on Windows], not its container the .dmg file. … Think of a .dmg as having 3 'stages'… stage 1 - the original .dmg file - when you double click that stage 2 - it mounts a virtual disk on your desktop, which will open to show something along the lines …
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2 votes

Would I be able to access myUser.dmg that created with Disk Utility after re-installing OS X?

Your problem will not be mounting or accessing the .dmg file, as you can always set any drive except your current boot drive to 'Ignore Ownership' from Get Info on that partition. …
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  • 118k
8 votes

Do applications install for all users or only for one?

It depends where it installs to. If it goes into the main Applications folder, then yes, it's available to all users - though each user will have their own distinct prefs, saved under their account. …
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