Step One
Connect a 8GB or larger USB key to your computer then launch the Mac App Store from your dock.
![](http://www.iclarified.com/images/tutorials/16149/55599/55599.jpg)
Step Two
Click the Purchased tab at top of the window the hold down the Option key and click the Purchased tab again.
![](http://www.iclarified.com/images/tutorials/16149/55628/55628-500.png)
**If you have not yet installed Lion then you can follow these instructions to buy it and begin downloading.
Step Three
Press the Install button for OS X Lion and wait while the operating system downloads. If the LaunchPad appears press the Escape key.
![](http://www.iclarified.com/images/tutorials/16149/55629/55629-500.png)
![](http://www.iclarified.com/images/tutorials/16149/55602/55602-500.png)
Step Four
Once the download has completed the Mac OS X Lion Installer will launch. Select Quit from the Install Mac OS X Lion to exit the installer.
![](http://www.iclarified.com/images/tutorials/16149/55626/55626-500.png)
![](http://www.iclarified.com/images/tutorials/16149/55625/55625.png)
Step Five
Click to launch a new Finder window from your dock.
![](http://www.iclarified.com/images/tutorials/16149/55624/55624.png)
Step Six
Navigate to the Applications folder and right click the new "Install Mac OS X Lion" icon then select Show Package Contents from the contextual menu.
![](http://www.iclarified.com/images/tutorials/16149/55609/55609-500.png)
![](http://www.iclarified.com/images/tutorials/16149/55610/55610.png)
Step Seven
Double click the Contents folder.
![](http://www.iclarified.com/images/tutorials/16149/55608/55608-500.png)
Step Eight
Then double click the SharedSupport folder
![](http://www.iclarified.com/images/tutorials/16149/55607/55607-500.png)
Step Nine
Locate the InstallESD.dmg file then open a new Finder window by pressing Command + N on your keyboard.
![](http://www.iclarified.com/images/tutorials/16149/55606/55606-500.png)
Step Ten
Navigate to your Applications:Utilities folder then double click Disk Utility to launch the application
![](http://www.iclarified.com/images/tutorials/16149/55612/55612-500.png)
Step Eleven
Select your USB thumb drive from the list on the left and click the Partition tab.
![](http://www.iclarified.com/images/tutorials/16149/55614/55614-500.png)
Step Twelve
Set the Partition Layout to 1 Partition, set the Name to OS X Lion, and set the Format to Mac OS Extended (Journaled) and then click the Options button.
![](http://www.iclarified.com/images/tutorials/16149/55615/55615-500.png)
Step Thirteen
Choose GUID Partition Table from the popup window then click the OK button.
![](http://www.iclarified.com/images/tutorials/16149/55616/55616-500.png)
Step Fourteen
Next click the Apply button to save your changes.
![](http://www.iclarified.com/images/tutorials/16149/55617/55617.png)
When asked to confirm click the Partition button.
![](http://www.iclarified.com/images/tutorials/16149/55618/55618-500.png)
Step Fifteen
Once the USB drive has been partitioned correctly, select the new OS X Lion partition from the list on the left and click the Restore tab.
![](http://www.iclarified.com/images/tutorials/16149/55620/55620-500.png)
Step Sixteen
Drag the InstallESD.dmg file we located earlier from the Finder window into the Source field. Then drag theOS X Lion partition from the list on the left into the Destination field.
![](http://www.iclarified.com/images/tutorials/16149/55622/55622-500.png)
Step Seventeen
Click the Restore button then click the Erase button from the confirmation popup to begin building your install key.
![](http://www.iclarified.com/images/tutorials/16149/55627/55627-500.png)
Another popup will appear asking you to log in. Enter your administrative username and password then clickOK.
![](http://www.iclarified.com/images/tutorials/16149/55623/55623-500.png)
Step Eighteen
When the restore is complete the Mac OS X Lion USB Install Key will be mounted and it will be ready to use.
![](http://www.iclarified.com/images/tutorials/16149/55605/55605-500.png)
Connect a 8GB or larger USB key to your computer then launch the Mac App Store from your dock.
![](http://www.iclarified.com/images/tutorials/16149/55599/55599.jpg)
Step Two
Click the Purchased tab at top of the window the hold down the Option key and click the Purchased tab again.
![](http://www.iclarified.com/images/tutorials/16149/55628/55628-500.png)
**If you have not yet installed Lion then you can follow these instructions to buy it and begin downloading.
Step Three
Press the Install button for OS X Lion and wait while the operating system downloads. If the LaunchPad appears press the Escape key.
![](http://www.iclarified.com/images/tutorials/16149/55629/55629-500.png)
![](http://www.iclarified.com/images/tutorials/16149/55602/55602-500.png)
Step Four
Once the download has completed the Mac OS X Lion Installer will launch. Select Quit from the Install Mac OS X Lion to exit the installer.
![](http://www.iclarified.com/images/tutorials/16149/55626/55626-500.png)
![](http://www.iclarified.com/images/tutorials/16149/55625/55625.png)
Step Five
Click to launch a new Finder window from your dock.
![](http://www.iclarified.com/images/tutorials/16149/55624/55624.png)
Step Six
Navigate to the Applications folder and right click the new "Install Mac OS X Lion" icon then select Show Package Contents from the contextual menu.
![](http://www.iclarified.com/images/tutorials/16149/55609/55609-500.png)
![](http://www.iclarified.com/images/tutorials/16149/55610/55610.png)
Step Seven
Double click the Contents folder.
![](http://www.iclarified.com/images/tutorials/16149/55608/55608-500.png)
Step Eight
Then double click the SharedSupport folder
![](http://www.iclarified.com/images/tutorials/16149/55607/55607-500.png)
Step Nine
Locate the InstallESD.dmg file then open a new Finder window by pressing Command + N on your keyboard.
![](http://www.iclarified.com/images/tutorials/16149/55606/55606-500.png)
Step Ten
Navigate to your Applications:Utilities folder then double click Disk Utility to launch the application
![](http://www.iclarified.com/images/tutorials/16149/55612/55612-500.png)
Step Eleven
Select your USB thumb drive from the list on the left and click the Partition tab.
![](http://www.iclarified.com/images/tutorials/16149/55614/55614-500.png)
Step Twelve
Set the Partition Layout to 1 Partition, set the Name to OS X Lion, and set the Format to Mac OS Extended (Journaled) and then click the Options button.
![](http://www.iclarified.com/images/tutorials/16149/55615/55615-500.png)
Step Thirteen
Choose GUID Partition Table from the popup window then click the OK button.
![](http://www.iclarified.com/images/tutorials/16149/55616/55616-500.png)
Step Fourteen
Next click the Apply button to save your changes.
![](http://www.iclarified.com/images/tutorials/16149/55617/55617.png)
When asked to confirm click the Partition button.
![](http://www.iclarified.com/images/tutorials/16149/55618/55618-500.png)
Step Fifteen
Once the USB drive has been partitioned correctly, select the new OS X Lion partition from the list on the left and click the Restore tab.
![](http://www.iclarified.com/images/tutorials/16149/55620/55620-500.png)
Step Sixteen
Drag the InstallESD.dmg file we located earlier from the Finder window into the Source field. Then drag theOS X Lion partition from the list on the left into the Destination field.
![](http://www.iclarified.com/images/tutorials/16149/55622/55622-500.png)
Step Seventeen
Click the Restore button then click the Erase button from the confirmation popup to begin building your install key.
![](http://www.iclarified.com/images/tutorials/16149/55627/55627-500.png)
Another popup will appear asking you to log in. Enter your administrative username and password then clickOK.
![](http://www.iclarified.com/images/tutorials/16149/55623/55623-500.png)
Step Eighteen
When the restore is complete the Mac OS X Lion USB Install Key will be mounted and it will be ready to use.
![](http://www.iclarified.com/images/tutorials/16149/55605/55605-500.png)
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