I recently bought Lion for $29.99 for my iMac on the App Store, and now want to burn a disc so that I can make another white Macbook that has Snow Leopard dual boot to Lion as well (Apple allows installing Lion on more than one machine that a user owns). Also, I wanted to create a disc so that if there is an need in the future, there is a disc to boot to.

But I followed the instructions on



which are both linked from Can I dual boot Snow Leopard and Lion?

and the InstallESD.dmg file cannot be found. In fact, if I type dmg in the Finder's search box, and chose "Disc Image" (kind / type), the whole hard disk doesn't have a file that is more than 90MB in size. If I go to the Applications folder, the largest size shown is merely 495MB...

How can this be solved? thanks.

1 Answer 1


When you buy Lion from the App Store, it downloads an application named Install Mac OS X Lion to your Applications folder. InstallESD.dmg is hidden inside this application. Since it's hidden, a Spotlight search normally won't show it; you need to find the installer application, right-click on it, choose Show Package Contents, and then navigate to the image inside it (both links have instructions for this).

There is one more complication: when you run the Lion installer application, it installs Lion and then deletes the installer. But you can re-download it if you know the trick: open the App Store, Option-click on the Purchases icon in the toolbar, and you should have a Download button available for OS X Lion.

  • could that file be already backed up on the Time Machine? Jun 6, 2012 at 7:34
  • Yes, if you have a Time Machine snapshot from after it was downloaded and before it was installed&deleted (and you didn't exclude /Applications from backups). Jun 11, 2012 at 0:07

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