![]() With this step, you can create a USB drive that can be used to install the new Mac OS X Lion. Right-click on the Install OS X Lion application and select Show Package Contents. Open the Applications folder, which is located in the Finder. Double-click on the InstallESD.dmg file on the desktop. You should see a file called InstallESD.dmg. Another window will appear with the contents of the InstallESD disk image. A new window will appear with the contents of the installation file. To do this, double-click on the installation file, which should have a. ![]() Mount the Mac OS X Lion installation file. When the erase process is complete, close the Disk Utility window. Select Mac OS Extended (Journaled) from the Format drop-down menu. ![]() Select your USB flash drive from the list of drives that appears on the left side of the Disk Utility window. Launch the Disk Utility application, which is located in the Utilities folder. Connect your USB flash drive to your Mac. Here’s what you’ll need to create a bootable Mac OS X Lion USB drive: A USB flash drive that is at least 8GB in size A copy of the Mac OS X Lion installation file Once you have everything you need, follow these steps to create your bootable Mac OS X Lion USB drive: 1. This will allow you to install Lion on any Mac that supports the use of bootable USB drives. If you’re interested in running Lion on your Mac, you can do so by creating a bootable USB flash drive. Apple’s latest operating system, Mac OS X Lion, was released on July 20, 2011.
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