For those of you who would like to keep the Lion Installer in a safe place, or you don't want to download it various times due to its large size or internet limitations, or even if you would like to install Lion on a fresh, clean hard drive. This method is for you. It was originally written on the website Egg Freckles, and I take no credit and/or responsibility in any damage done to your Mac or hard drive; prior, during or after the process. I just simplified the text for easy reading. Here it goes: • Purchase and download "Mac OSX 10.7: Lion" from the Mac App Store on any Lion compatible Mac running Snow Leopard. (Download size is about 4GB) • Right click on "Mac OS X Lion" installer and choose the option "Show Package Contents" • Inside the "Contents" folder, you will find a "SharedSupport" folder and inside it you will find the Lion boot disc image "InstallESD.dmg" This is where the process changes depending on how you want to make your Lion Boot Drive, whether on an external hard drive or a standard 4.7GB DVD: External Hard Drive: • Launch Disk Utility. Select your external drive. Go to the "Partition" tab. Make a new 5GB partition solely for the Lion Installer and choose "Mac OS Extended (Journaled)” as the format. • Still inside Disk Utility go to the "Restore" tab. Drag "InstallESD.dmg" to the "Source" field, and drag your newly created partition from the left side of the Disk Utility window into the "Destination" field. Check "Erase Destination", and begin your restore. (This process will erase everything on that particular partition). • Once Disk Utility's restoration is complete you will have a Mac First Aid Kit capable of booting and installing Lion clean. DVD: • Copy "InstallESD.dmg" to another folder like the Desktop. • Launch Disk Utility and click the "Burn" button. • Select the copied "InstallESD.dmg" as the image to burn, insert a standard sized 4.7 GB DVD, and wait for your Lion Boot Disc to come out. After you get your Lion Boot Drive prepared, plug in the external drive or the DVD and: • Restart your Mac while holding the "option" key, and choose "Mac OS Install ESD" as the startup volume. • Once booted from the Lion Boot Drive (DVD or external drive) you will have the opportunity to run Disk Utility and erase your Mac's primary hard drive. From the "Erase" tab, select it and choose “Mac OS Extended (Journaled)” as the format. Before you erase the drive confirm you have a known good backup then click "Erase…" • With your Mac's primary hard drive wiped clean it is now time to begin installing Lion. Quit Disk Utility to go back to the Lion installer. Choose your Mac's primary hard drive as the destination, and continue with the OS installation process. ENJOY THE NEW ROARING BEAST!