Some avant-garde users may wish to create an ISO file of the macOS Big Sur installer file (or MacOS Catalina installer, or MacOS Mojave installers for that matter). These can be useful for installing MacOS into virtual machines like VirtualBox and VMWare, and because the resulting installer is an ISO file it can be helpful for creating an alternative installer media whether on an SD Menu, external hard bulldoze, USB wink primal, or similar, especially when the typical approach to creating a bootable USB installer drive for MacOS Big Sur is not viable or possible.
Because the macOS installer awarding is an .app file and do not go far every bit a disk image, to create a MacOS ISO file requires a sequence of steps through the control line, or the employ of a 3rd party application. For the purposes here, we’ll walk through how yous can make a MacOS Big Sur ISO file past using the terminal.
How to Create a MacOS Big Sur ISO File
Nosotros volition be focusing on making an ISO file for macOS Big Sur, but you can utilize this same approach for making an ISO file of MacOS Catalina and macOS Mojave besides.
- Get the MacOS Installer application that you wish to utilise:
- For MacOS Big Sur, macOS Catalina and MacOS Mojave, go to the Mac App Store (or utilize this method to download full macOS installers) and download the installer applications for the macOS version you lot wish to make an ISO file of
hdiutil create -o /tmp/MacBigSur -size 12500m -volname MacBigSur -layout Tater -fs HFS+J
hdiutil attach /tmp/MacBigSur.dmg -noverify -mountpoint /Volumes/MacBigSur
sudo /Applications/Install\ macOS\ Big\ Sur/Contents/Resources/createinstallmedia --book /Volumes/MacBigSur --nointeraction
hdiutil detach /Volumes/MacBigSur/
hdiutil convert /tmp/MacBigSur.dmg -format UDTO -o ~/Desktop/MacBigSur.cdr
mv ~/Desktop/MacBigSur.cdr ~/Desktop/BigSur.iso
Bold you completed the steps properly, you lot should at present have an ISO file called MacBigSur.iso on the Mac desktop. This is basically a variation of converting an installer to ISO every bit discussed hither, which you may have some familiarity with already.
The resulting macOS Big Sur ISO file tin can now be used to install macOS Big Sur into various virtual machines including VirtualBox and VMWare, and it can too be used to burn to diverse media including Blu-Ray, SD Cards, external difficult drives, and USB Flash drives.
For what information technology’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 control line anyway for working with the createinstallmedia utility the whole process may too stay in the Terminal.
Obviously this is specifically for if you demand to create a MacOS installer ISO file for whatever reason, simply it’s worth pointing out that this is non necessary if you simply want to create kick disk USB Installer for macOS Big Sur beta (or terminal), kick 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.
Did this work for yous? Exercise you know of another fashion to create an ISO file of macOS Big Sur installers, MacOS Catalina installers, or brand an ISO of an macOS Mojave installer? Let us know your experiences in the comments below.