If you're burning it to a DVD, insert your DVD, select the disk image in the sidebar, and hit the 'Burn' button. Open up Disk Utility and drag the DMG file into the left-hand sidebar. Navigate to Contents > SharedSupport and look for a file called 'InstallESD.dmg'. Right-click on the installer and hit 'Show Package Contents'. The installer should show up in your Applications folder.

On a Macĭownload Lion from the Mac App Store. However, the other option is to use a Virtualbox VM to run OS X temporarily (scroll down for that info). Those of you who want a more turn-key solution should consider Lion DiskMaker, a donationware AppleScript app that will let you make a bootable DVD or thumb drive from a Lion or Mountain Lion installation program.As far as I know, the only way to properly create a bootable Lion disc/disk is to use Disk Utility on a working Mac.

Once it's done, eject it, label it clearly, and either use it to install Mountain Lion on a newly formatted hard drive or if you've already upgraded through the normal installer, put it away for a rainy day. It will take some time for the drive to be written. You may have to authenticate as an administrator.ġ0. Click Restore and agree to Erase the drive and replace it with the contents of InstallESD.dmg. Mount InstallESD.dmg (by double-clicking) and drag the mounted image from your desktop into the source location (Thanks, shamguy4) Drag Untitled 1 from the left column to the destination field. Drag InstallESD.dmg into the file-open window and click Open. Next, select the new partition (Untitled 1 by default). Wait as it unmounts, partitions, and remounts your disk.Ĩ. Click the Options button at the bottom-right of the partition layout. Choose Format > Mac OS Extended (Journaled).Ħ.

With this drive selected, click the Partition tab and choose Partition Layout > 1 Partition. Drives are listed first with their partitions listed after them, each partition indented slightly.ĥ. Prepare it for use by creating a single HFS+ partition. Attach a thumb drive to your Mac that is at least 8GB in size. Navigate to /Applications/Utilities and launch DiskUtility.Ĥ. Open a new Finder window with Command-N (File > New Finder Window). There you'll find a disk image called InstallESD.dmg.ģ. A new Finder browser window opens, showing the normally hidden material inside the installer bundle.Ģ. Right-click (or Control-click) the installer and choose Show Package Contents from the contextual pop-up. By subscribing, you are agreeing to Engadget's Terms and Privacy Policy.ġ.

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