1. Delete Downloads Folder
2. Can You Delete Program Files

Nov 18, 2019 A DMG file is 'mounted' as a drive and is treated by the operating system as if it were a physical hard drive, making it really easy to view its contents. The software you download for your Mac in a DMG format can be opened like any other file on a Mac, and then the setup program can be run to install the software.

File type: Mac OS X Disk Image. Open DMG File. The usage of the DMG file extension is in the context of a mountable disk image file which is generated by the Mac OS X Operating System platform. Once the file is opened, the system will mount it in a virtual disk located on the user's desktop.

1. Can I delete.dmg files from Downloads folder? Doing so will simply free up space. Since the applications were downloaded from internet sources you can always redownload should you lose one. Drag the.dmg files to the Trashcan on the Dock or select all of them and press COMMAND-DELETE to move all of them to the Trash. Now Empty the Trash to.
2. If you don't need them, you can delete installer files. If you plan on reinstalling OS X from scratch (or should you need to uninstall and reinstall a specific application), having installers in a folder on an external hard drive can come in handy and save you time, as you don't have to download them again.

Lots of good points in this thread. I've re-thought how this should work.

My problem is that my downloads folder gets cluttered with dmg files. I can't remember which ones I've already installed. Some of them I have opened and installed, but I've forgotten to move them out of my downloads folder. Some of them I downloaded but haven't opened yet.

Delete Downloads Folder

My new version of the script moves the dmg file when it is mounted. To use it, save this script to '/Library/Scripts/Folder Action Scripts/' and attach this folder action script to the /Volumes directory. Ideally, my script would trigger when you eject the disk image, but by then it's too late; the disk image is gone, and there's nothing left for AppleScript to process. I figure triggering on mount was pretty good, since I really wanted to know what dmg files I had opened or not.

Can You Delete Program Files

Most of you didn't want to delete the dmg file. That's a good idea. My script now moves it to a dmg_archive folder. Feel free to change this to suit your needs.