In Disk Utility, select InstallESD.dmg in the sidebar You can use Disk Utility’s Restore screen to create a bootable flash drive or hard drive.
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However, with the 10.7.4 installer, you must use the mounted Mac OS X Install ESD volume or you will get an error at the end of the restore procedure and the newly created bootable drive may not function properly.
Note: In versions of the Lion installer prior to 10.7.4, you didn’t need to first mount the InstallESD.dmg image-you could simply drag the image itself into the Source field. The restore procedure will take anywhere from five to 15 minutes, depending on your Mac and the speed of your drive.
The mounted volume is called Mac OS X Install ESD. This mounts the disk image’s volume in the Finder.
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If your only Mac was released after Lion, so you can’t download the Lion installer from the Mac App Store, I’ve also provided instructions for creating a bootable Lion-install drive for newer Macs. So if you create a bootable Lion-installer drive using the current version of the Lion installer-which, as of, installs OS X 10.7.3-that drive will work with all current Lion-capable Macs. However, unlike with the CD- and DVD-based Mac OS X installers of old, Apple can-and does-update the Mac App Store version of the Lion installer. Update: When this article was originally published, the Mac App Store version of Lion would not boot any Macs released in mid-2011 or later, as those models shipped with a newer version of Lion preinstalled.