DMG File – What Is It & How to Open/Create It on Windows/Mac?

What Is DMG File

DMG file is an Apple Disk Image file.

DMG is typically a file format used to store compressed software installers without having to use a physical disc.

You will most likely only see them when downloading macOS software from the internet.

DMG files also support 128-bit and 256-bit AES encryption, which means you might create password-protected compressed folders.

DMG files contain something called a checksum, which basically verifies that the file is 100% intact.

Thats the second reason macOS uses DMG files theyre a compressed format that keep your downloads smaller.

Once the file is clicked, the DiskImageMounter utility bundled with macOS verifies the integrity of the disk image.

you’ve got the option to double-grab the program icon in a Finder window to launch the program.

How to create the OMG file on Mac?

Here are the steps:

OpenDisk Utilityand chooseFile > New Image > Image from Folder.

In the window, opt for folder you want to encrypt and click theChoosebutton.

When you encrypt the folder, your Mac will prompt you to put in your password twice.

Also, by default, the DMG file is read-only.

If you want a read-write DMG, change theImage Formatoption fromCompressedtoRead/Write.

When you go to open your new DMG file, it will prompt you for the password you chose.

After typing the password, the DMG file will mount like any other.

The following are two tips for using the DMG file.

Use the Correct File

If youre on a Windows computer, look for a similar file namedISO.

Using this throw in of file avoids the need for extraction tools.

You also dont need to download the utility files in macOS format.

Look for files with this file extension, if possible.

Think of this download as a way to avoid plugging another storage system into your gear.