Make OS X Lion launch u disk, mountain lion also apply

Many people have purchased the latest operating system lions (OS X Lion) in Apple's App store. However, after the upgrade found some problems, such as: power-on and shutdown speed significantly slower, some programs stop responding. Today I'd like to introduce how to make a startup USB drive to install a new operating system after buying OS X Lion from the app store to avoid problems from the old system upgrade.

First, the OS X lion that you just downloaded from the App Store will be placed in the dock at the bottom of the screen.

Drag the Mac OS X Lion 10.7 files from the dock to the desktop with the mouse.

Right-click Mac OS X Lion 10.7 and select Show package content.

In the Contents folder, go to the Sharedsupport folder and locate the Installeso.dmg file.

Double-click to run the InstallESD.dmg file and wait for the load to complete.