Now you can start up your VM, open the Disk Utility.app within the installer and create a new HFS+ partition to install a fresh copy of Yosemite. Open VirtualBox, insert the customized yosemitefixed.dmg in the CD-ROM drive of your guest system and make sure to adjust the chipset to ' PIIX3'.

dmg file (UDZO format): hdiutil convert yosemite.sparseimage -format UDZO -o yosemitefixed.dmg Note: If that doesn't work and you get a 'resource busy' message in step 12, try using the Disk Utility.app:įinally we can convert it back into a.

Hdiutil unmount '/Volumes/OS X Base System/'Īs well as the mounted disks via diskutil and your Terminal: diskutil unmountDisk $(diskutil list | grep 'OS X Base System' -B 4 | head -1)ĭiskutil unmountDisk $(diskutil list | grep 'OS X Install ESD' -B 4 | head -1) Unmount both the InstallESD and the sparse image: hdiutil unmount '/Volumes/OS X Install ESD/' to copy the missing original base system files back into the customized InstallESD: cp '/Volumes/OS X Install ESD/BaseSystem.'* '/Volumes/OS X Base System/' hdiutil mount '/Applications/Install OS X Yosemite.app/Contents/SharedSupport/InstallESD.dmg' Now we need to mount both the original InstallESD and the customized sparse image that we just generated. Hdiutil convert yosemite.dmg -format UDSP -o yosemite.sparseimage How-to Preparationĭownload OS X Yosemite from the Mac App Store and open the Terminal.app to install iesd, a Ruby tool to customize OS X Install ESD's: sudo gem install iesdīefore we can use the vanilla Yosemite Installer in VirtualBox, we have to customize the InstallESD using iesd first as well as convert it into a sparse image (UDSP format): iesd -i '/Applications/Install OS X Yosemite.app' -o yosemite.dmg -t BaseSystem Legal disclaimer: Make sure to perform the following steps on a regularly purchased Apple computer, running a genuine OS X (host) operating system. It's based on this pastebin which I found via Google, adjusted to work with Yosemite. The guide below tries to explains how to easily install Mac OS X Yosemite 10.10 in a virtual machine using VirtualBox.

Install mac os x yosemite on virtualbox