Select Partition tab and set Partition Layout option to 1 Partition and Partition format set to Mac OS Extended (Journaled).Plug your USB flash disk to USB port and select it in the Disk Utility white left sidebar.Drag the InstallESD.dmg file and drop it to the left white sidebar in Disk Utility.Start the Disk Utility application (Applications/Utilities/Disk Utility).Go to the Contents/ShareSupport directory in which you can find the InstallESD.dmg file.Click the right mouse button on the Lion installer and select the Show Package ContentsĀ option.In the Applications directory, App Store will create application called Install Mac OS X Lion.App Store will offer you Lion installation to download again. If you want to re-download Lion installation application, open the App Store, hold the Option (Alt) key and click on Purchased button. After the download is finished, close the automatically opened installation window for the Lion update. Download the Mac OS X Lion update from the Apple App Store.DVD or USB Lion installation is useful if hard drive partitions in your Mac crashed or after installation of a new hard drive to your Mac, because Lion Recovery utility will be unavailable. To run Lion Recovery press and hold Command + R keys during startup. Lion Recovery can restore Lion to default settings, like after clean installation. Mac OS X Lion has integrated recovery utility called Lion Recovery. Disk Utility that is used to create the USB Lion installation, will format the USB flash disk and all data saved on it will be deleted. The USB flash disk must have more than 5 GB of free capacity. Mac OS X Lion USB flash disk installation must be created before you update your Mac, because after update process, the system will delete the installationĀ application.
How to create bootable installation flash disk of Mac OS X Lion