mv /tmp/ElCapitan.iso.cdr ~/Desktop/ElCapitan.iso
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# Create a blank temporary disk image container hdiutil create -o /tmp/ElCapitan.cdr -size 7316m -layout SPUD -fs HFS+J # Mount the temporary disk container hdiutil attach /tmp/ElCapitan.cdr.dmg -noverify -nobrowse -mountpoint /Volumes/install_build # Mount the official Apple Core Installation Disk Image hdiutil attach /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/SharedSupport/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app # Restore the base system structure onto your temporary container asr restore -source /Volumes/install_app/BaseSystem.dmg -target /Volumes/install_build -noprompt -noverify -erase # Unlink the generic packages placeholder and swap in the actual installation files rm /Volumes/OS\ X\ Base\ System/System/Installation/Packages cp -rp /Volumes/install_app/Packages /Volumes/OS\ X\ Base\ System/System/Installation/ # Unmount both active disk volumes hdiutil detach /Volumes/OS\ X\ Base\ System hdiutil detach /Volumes/install_app # Convert the finalized .cdr format into a globally compatible .iso image hdiutil convert /tmp/ElCapitan.cdr.dmg -format UDTO -o ~/Desktop/ElCapitan.iso Use code with caution. Option B: Downloading Verified Pre-Built Images
This is the most common error when working with older Mac ISOs. It happens because the original security certificates wrapped inside the installer have expired.
sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app --nointeraction macosxelcapitan10111imageiso work
: If you download a .dmg from Apple, opening it reveals an InstallMacOSX.pkg . You must run this package to "install" the actual application file into your Applications folder. It is only about 7MB and does not install the OS itself, just the installer app.
Rename the .cdr file to .iso :
Once your ISO boots successfully, you will see the macOS Utilities screen. Many users get stuck here because the installer won't show any available hard drives to install onto. To fix this, you must manually format your virtual disk: Select from the menu and click Continue .
Once the file copy is successful, unmount the volume securely. hdiutil detach /Volumes/Install\ OS\ X\ El\ Capitan Use code with caution. 5. Convert the DMG to ISO Format mv /tmp/ElCapitan
Wait for the previous command to finish. It will take a few minutes. Then, unmount the volume we created.
Use Apple's built-in tool to write the installer files into the image:
Open Terminal (found in Applications > Utilities).
Once the app is in your Applications folder, use these Terminal commands to build the ISO image. Can’t copy the link right now
Before starting the installation layout inside your boot loader or VM, disconnect the internet. Open the terminal utility from the top menu bar of the installer screen and roll back the system clock to 2016 by typing: date 0201101516 Use code with caution.
Here’s a technical write-up based on the search phrase — broken down to clarify what this likely refers to, the challenges involved, and how to properly work with OS X El Capitan (version 10.11.1) image files.
hdiutil create -o /tmp/ElCapitan.cdr -size 7300m -layout SPUD -fs HFS+J Use code with caution. Mount the newly created blank image to your system: