Anything above or equal to big sur is double the size because not only does macOS have to support and compile ALL the librarys for the M1 (arm64) instruction set, but the intel (x86_64) instruction set as well.

Prior to big sur, macOS used to be in the single digits for GB. I tried it out with macOS Catalina (however, it was one that I stored on my hard drive but the same one as uploaded here) and it seemed to run fine under the 'utility' part of macOS, didn't install Catalina but everything else looked fine.Ī windows 10 ISO is around 8 GB. I recently got temporary access to a macbook that's old enough to run virtualbox. It is version 12.6.06, and 12.6.03 was used to circumvent an error preventing me from creating the file. I changed it to 12.6.03 so when you boot up this ISO, and quicklook at the app inside you may see that it says 12.6.03. I had to modify ist () to change the app version in order for it to work. dmg file also installs the application to your Applications folder.į2 - The app used to make the ISO was downloaded prior to Sierra being invalidated from the App Store, and also prior to being added to the support article in PKG form.į3 - When using the app to build the ISO, it failed. (Keep in mind that opening and running the. app/Contents/SharedSupport (This generates the app, and I will explain how the app is used) Move InstallESD.dmg to Payload/Install macOS. pkg file was unziped using pkgutil -expand-fullĢ. hdiutil convert /tmp/.dmg -format UDTO -o ~/Desktop/.cdrį1 - These ISOs were made using DMGs from this article.app/Contents/Resources/createinstallmedia -volume /Volumes/ -nointeraction hdiutil attach /tmp/.dmg -noverify -mountpoint /Volumes/.hdiutil create -o /tmp/ -size m -volname -layout SPUD -fs HFS+J.

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