What do the suction force values Pa, kPa or AW mean for.Now the hard disk service program only needs a few minutes to create the DMG and our handy macOS Catalina installer is ready, which can also be shipped via Dropbox or other services. At this point we select our new directory on the desktop in which the Catalina installer is located. Here you will be asked for the folder from which the DMG will be created. Next, open the hard disk utility and select 'File> New Image> Image from Folder' at the top left. I would just do without dots and special characters in the file name so that there would be no problems on other operating or file systems. I named the folder 'macOS Catalina Installer 10-15' but you can be creative here. If you want to keep a copy in the Applications folder, hold down the ALT key while dragging and dropping. To do this, we create a new folder on the desktop and drag the 'macOS Catalina Installer' into it. Instructions: Create DMG image from folder We copy the installer from the programs folder into a new directory that we created on the desktop. But you can save yourself the step if you copy the Installer.app directly to a USB stick or an external hard drive. We definitely want to package the installer app in a DMG for easier use and shipping in the future. What arrives there only has a few kB and can no longer be used as an installer. You can find out quickly if, for example, you throw the 'macOS Catalina Installer' into the dropbox. The next step is now to package this app in a DMG so that it is actually a file, because an '.app' file is usually only displayed as a single file and is in reality a folder with all the content, that belong to the app. The installer is now secured for the time being. In my screenshot (below) you can also see the file extension '.app' because I am displaying the file extensions. Now we switch to the “Applications” folder and look for the “Install macOS Catalina” file. To the right of the apple menu is the menu item that allows you to cancel the installer before making changes to the system.

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