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.
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