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Private tmp var Install Mac OS X Lion.app System bin etc sbin usr Mikes-imac:Mac OS X Install ESD mike$ cd /Volumes/Mac\ OS\ X\ Base\ System/ mikes-imac:Mac OS X Install ESD mike$ hdiutil attach BaseSystem.dmg The contents of BaseSystem.dmg are shown below. mikes-imac: mike$ /usr/libexec/plistbuddy. This is shown in the file (“rp” stands for root path). When booted into Recovery HD, BaseSystem.dmg is mounted as the boot volume with the volume name “Mac OS X Base System”.
Mikes-imac: mike$ lsīaseSystem.chunklist ist boot.efi kernelcacheīaseSystem.dmg ist Mikes-imac:~ mike$ cd /Volumes/Recovery\ HD// Volume Recovery HD on /dev/disk0s3 mounted mikes-imac:~ mike$ diskutil mount /dev/disk0s3 diagnostics folder inside of the folder. Newer Mac models that support diskless Apple Hardware Test may also have a disk image for it contained within a hidden. mikes-imac:~ mike$ diskutil listĢ: Apple_HFS Macintosh HD 999.3 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3Īs mentioned earlier, BaseSystem.dmg can be found on Recovery HD, as shown below. Recovery HD is created during the Lion installation process as a very small hidden partition on the primary boot drive. Let’s take a look at Recovery HD.Īs a Mac admin, you can rejoice in the fact that the days of keeping stacks of hardware-specific restore discs to reinstall Mac OS X are gone. BaseSystem.dmg is copied to the Recovery HD partition after it’s created during the Lion installation process. It is what actually installs Lion to the hard drive. That installer runs when booted from InstallESD.dmg. Yes, that is another Install Mac OS X Lion.app. Looking inside of InstallESD.dmg, take note of two important files: Install Mac OS X Lion.app and BaseSystem.dmg. Mikes-imac:SharedSupport mike$ cd /Volumes/Mac\ OS\ X\ Install\ ESD/īaseSystem.chunklist MacOSX_Media_Background.png kernelcache mikes-imac:SharedSupport mike$ hdiutil attach InstallESD.dmg The computer would then restart and proceed with and finish the installation. After those completed, the installer would prepare InstallESD.dmg to be mounted as the boot volume. A consumer installing Lion would have several pre-installation steps handled by the Install Mac OS X Lion application. As a Mac admin, you can use it to create an external bootable Lion install disk, build a NetInstall or NetRestore set, have it act as the Install DVD for an InstaDMG workflow, and more. InstallESD.dmg is the new-age Mac OS X retail DVD. Mikes-imac:Contents mike$ cd /Applications/Install\ Mac\ OS\ X\ Lion.app/Contents/SharedSupport/ InstallESD.dmg is located within the application’s Contents/SharedSupport directories. Let’s take a deeper look at InstallESD.dmg, Recovery HD, and Lion Internet Recovery to see what they are, what they mean for you as a Mac Admin, and how they’re all related.Īfter downloading Lion from the Mac App Store, Install Mac OS X Lion.app is placed in the /Applications directory. Because InstallESD.dmg is available via the web, users are able to reinstall Lion through Recovery HD or Lion Internet Recovery in worst-case scenarios without needing physical restore media.
Initially contained within it is also the disk image that forms the basis of Recovery HD. InstallESD.dmg does more than just handle the initial Lion installation. And although downloaded as an application from the Mac App Store, Install Mac OS X Lion.app, contained within it is the disk image that makes the OS X Lion installer magic happen: InstallESD.dmg.
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OS X Lion is only available via an Internet download through the Mac App Store.
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But just in case you haven’t, or just in case you need a quick refresher, with the release of OS X Lion, Apple completely changed its distribution method for Mac OS X. If you’ve done any deployment work with OS X Lion, InstallESD.dmg is probably not a new concept for you.
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