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Go ahead and pick (if you want) Dynamically allocated: Select the default VDI (VirtualBox Disk Image) disk type: If you name it something like “OSX” VirtualBox will automatically select the type of Virtual Machine you want to create (“Mac OSX”):Ĭlick “Continue” and select then the memory size in the next screen. You can do this by clicking the blue icon (“new”) at the top: Creation Proceed creating a new Virtual Machine. Open now VirtualBox (you can download it there: “ “). and we’ll instruct it to mount it in a location where we will then intend to access its content.We’ll no verify the image (with the checksums): “ -noverify“.We’ll tell the system to hide the content of this disk from Finder with: “ -nobrowse“.We’ll then proceed to attach this disk image and at the same time: (So essentially in: “ /Applications/Install OS X El Capitan.app/ Contents/SharedSupport/InstallESD.dmg“)

Inside its content: “/ Contents/SharedSupport/InstallESD.dmg” The disk we want to attach is contained in the app you downloaded from the App Store: “ /Applications/Install OS X El Capitan.app” We achieve this using the “ hdiutil” command: “ attach“. Effectively simulating a device (the installation disk in this case) attached to our mac.

It is a command used to manipulate disk images and you can find detailed about this command here:įirst thing we need to do is attaching the image of the installer (that we downloaded) as a device. We’ll make heavy use of the “ hdiutil” tool. I will put the whole list of commands at the end of this article, but I will explain every line to make it clear what’s going on. What we’ll need to do is manipulate the installer disk in order to make it ready for our Virtual Machine to understand.

I wrote a dedicated post for this and you can find it here:Ĭreate Mac OS X Installer USB Disk Time to do some magic!Īs it stand the installer will not work on the Virtual Machine (and you will experience the error I mentioned at the start of the article). The very first thing to do is to download the OS X Installer.