I strongly suggest doing this in (a VM of!) Mavericks or Yosemite as the old DiskUtility has the ability to create a CUSTOM SIZED image file, and I wanted to do that to make it as small as possible, rather than a wasteful 8.3Gb - mine comes in at 6.97Gb file.
BTW this is tested and working in VMWare Fusion 8.0.1 running on ElCap host. I am going to list the steps in a rather verbose manner to avoid any confusion but you will see it is rather simple after all. I registered with MacRumors just to post this, so hopefully you (all) find it useful. Sadly I discovered that all the old Mavericks and Yosemite stuff didnt work, but after much testing (in VMs of course!) I now DO have a fully bootable and working ISO of ElCap. I found this thread as I too was looking for a bootable ISO image of ElCap as I am a bit of a VM guy myself. Sudo drutil burn /Users/YOURNAME/Desktop/El\ Capitan.iso Mv /tmp/El\ Capitan.cdr ~/Desktop/El\ Capitan.iso Hdiutil convert /tmp/El\ Capitan.sparseimage -format UDTO -o /tmp/El\ Capitan Hdiutil resize -size `hdiutil resize -limits /tmp/El\ Capitan.sparseimage | tail -n 1 | awk ''`b /tmp/El\ Capitan.sparseimage Rm /Volumes/install_build/System/Installation/PackagesĬp -rp /Volumes/install_app/Packages /Volumes/install_build/System/Installation/Ĭp -rp /Volumes/install_app/BaseSystem.chunklist /Volumes/install_buildĬp -rp /Volumes/install_app/BaseSystem.dmg /Volumes/install_build
Hdiutil attach /tmp/El\ Capitan.sparseimage -noverify -nobrowse -mountpoint /Volumes/install_build Hdiutil resize -size 9g /tmp/El\ Capitan.sparseimage Hdiutil convert /Volumes/install_app/BaseSystem.dmg -format UDSP -o /tmp/El\ Capitan Hdiutil attach /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/SharedSupport/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app On the last line,it starts with "sudo",replace "YOURNAME" with the username for the account you are logged into at the time. Here's the code anyway.Maybe someone else can tweak it to make it work. The reason being that during the installation,toward the end of the boot process it freezes. It seems there was code that was included in the O/S to dissuade the creation of optical discs though.
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