In Lion Recovery you can check or repair your hard drive, erase your hard drive and reinstall a fresh copy of Lion, or restore your Mac from a Time Machine backup. Hold down Command + R keys during startup to run Lion Recovery utility. One of new features in Mac OS X Lion is system recovery from the hard drive. To boot Mac OS X Lion installation from the DVD, put it to the drive, restart your computer and hold the C key on keyboard.After that click on the Burn button again and wait until the burning process is finished. The Disk Utility will show burning options, which you can tweak.Select the InstallESD.dmg file in the sidebar and click on the Burn button in the upper menu.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 'show package contents' 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. Mac OS X Lion DVD installation must be created before you update your Mac, because after update process, system will delete the Installation Mac OS X Lion application.

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