![]() ![]() Unmount the newly created volume with the following command:.Sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/MacOSBigSur -nointeraction Next, use createinstallmedia utility to copy the installer files to the disk image DMG file you just created:.Hdiutil attach /tmp/MacOSBigSur.dmg -noverify -mountpoint /Volumes/MacOSBigSur Mount the disk image with the following command:.Hdiutil create -o /tmp/MacOSBigSur -size 16500m -volname MacOSBigSur -layout SPUD -fs HFS J From the command line, create the disk image DMG file destination and temporary volume by issuing the following command:.When the download has finished, open the Terminal application.If you’re already on macOS Big Sur you can re-download the installer with these instructions) Get macOS Big Sur from the Mac App Store (you can download other macOS installers from here if needed. ![]() We’re focusing on macOS Big Sur but this approach works with other macOS releases too. We will walk through the process of getting a macOS Big Sur DMG file by building one from the downloaded installer media. ![]() Nonetheless, if you’re wanting a macOS Big Sur DMG, here’s how you can get one. For what it’s worth, if you’re looking to create boot media, it’s probably better to simply make a macOS Big Sur bootable install USB drive using the more traditional approach. ![]()
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