I did this for a virtual machine, but for other Macs I make a boot flash drive instead.Here you will find links to VirtualBox binaries and its source code.īy downloading, you agree to the terms and conditions of the respective license. Hdiutil eject -force /Volumes/Install\ macOS\ Big\ Surĩ: Reboot will clear this automatically or you delete the tmp file manually Mv -v ~/Downloads/BigSur.cdr ~/Downloads/BigSur.isoħ: Do with the ISO whatever you want, for me it is for creating virtual machineĨ: Eject the original mounted volume or reboot Mac and the volume will eject Hdiutil convert /tmp/BigSur.dmg -format UDTO -o ~/Downloads/BigSur.cdr Sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/BigSur -nointeraction Sudo hdiutil attach /tmp/BigSur.dmg -noverify -mountpoint /Volumes/BigSurĤ: Used the disk image as destination for creating installer using Mac App Store download Sudo hdiutil create -o /tmp/BigSur -size 17600m -volname BigSur -layout SPUD -fs HFS J Here is how I did it, all Terminal except the App Store download.ġ: First download macOS Big Sur installer from App Store or if elsewhere and put it in /Applications folder Obviously this is specifically for if you need to create a MacOS installer ISO file for whatever reason, but it’s worth pointing out that this is not necessary if you simply want to create boot disk USB Installer for macOS Big Sur beta (or final), boot installers for MacOS Catalina, or for MacOS Mojave, all of which are possible by using the createinstallmedia commands and having a USB flash key handy to use as the installer media.ĭid this work for you? Do you know of another way to create an ISO file of macOS Big Sur installers, MacOS Catalina installers, or make an ISO of an macOS Mojave installer? Let us know your experiences in the comments below. The resulting macOS Big Sur ISO file can now be used to install macOS Big Sur into various virtual machines including VirtualBox and VMWare, and it can also be used to burn to various media including Blu-Ray, SD Cards, external hard drives, and USB Flash drives.įor what it’s worth, you can also convert dmg and cdr files to ISO with Disk Utility too, but the terminal approach to converting dmg to ISO and vice versa with hdiutil is long established and works well, and since you’re already in the command line anyway for working with the createinstallmedia utility the whole process may as well stay in the Terminal. This is basically a variation of converting an installer to ISO as discussed here, which you may have some familiarity with already. Mv ~/Desktop/MacBigSur.cdr ~/Desktop/BigSur.isoĪssuming you completed the steps properly, you should now have an ISO file called MacBigSur.iso on the Mac desktop. Finally, we change the file extension from.Hdiutil convert /tmp/MacBigSur.dmg -format UDTO -o ~/Desktop/MacBigSur.cdr Next, we’ll convert the freshly created MacOS Installer disk image file to a CDR / ISO file that will appear on the desktop:. When finished, we then unmount the disk image volume: Hit return and enter the admin password to authenticate, let this process complete as it makes the installer that will turn into the ISO.Sudo /Applications/Install\ macOS\ Big\ Sur/Contents/Resources/createinstallmedia -volume /Volumes/MacBigSur -nointeraction Now we’ll use the createinstallmedia utility that is part of the MacOS Installer application to copy the installer files to the disk image you just created:.Hdiutil attach /tmp/MacBigSur.dmg -noverify -mountpoint /Volumes/MacBigSur Hdiutil create -o /tmp/MacBigSur -size 12500m -volname MacBigSur -layout SPUD -fs HFS J First, we must create a temporary disk image:.Next launch the Terminal application by hitting Command Spacebar and typing “Terminal” and hitting the return key, or by launching it directly from the Utilities folder.The MacOS installer app should be in the /Applications folder and be labeled as “Install macOS Big Sur.app” or similar, keep it there and make note of the file name.For MacOS Big Sur, macOS Catalina and MacOS Mojave, go to the Mac App Store (or use this method to download full macOS installers) and download the installer applications for the macOS version you wish to make an ISO file of.Get the MacOS Installer application that you wish to use:.We will be focusing on making an ISO file for macOS Big Sur, but you can use this same approach for making an ISO file of MacOS Catalina and macOS Mojave too. For the purposes here, we’ll walk through how you can make a MacOS Big Sur ISO file by using the terminal. app file and do not arrive as a disk image, to create a MacOS ISO file requires a sequence of steps through the command line, or the use of a third party application. Because the macOS installer application is an.
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