It includes a copy of all sectors of the disk image, whether they’re used or not. Read/write: Allows you to add files to the disk image after it’s created.ĭVD/CD master: Can be used with third-party apps. Read-only: The disk image can’t be written to, and is quicker to create and open.Ĭompressed: Compresses data, so the disk image is smaller than the original data. You can now quit Terminal and eject the volume.In the Disk Utility app on your Mac, choose Images > Convert, select the disk image file you want to convert, then click Open.Ĭlick the Image Format pop-up menu, then choose a new image format. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Monterey.After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume.Terminal shows the progress as the volume is erased. When prompted, type Y to confirm that you want to erase the volume, then press Return.Terminal doesn't show any characters as you type. When prompted, type your administrator password.If the volume has a different name, replace MyVolume in the command with the name of your volume. Each command assumes that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. Type or paste one of the commands below into Terminal, then press Return to enter the command.Open Terminal, which is in the Utilities folder of your Applications folder.Plug in the USB flash drive or other volume that you're using for the bootable installer.

Mac disk image file