Apple has made the installation process for OS X Lion slightly different than it was for previous versions of the operating system. But even with the differences, you can still create a clean installation of Lion on an internal drive, a partition, an external drive, or a USB flash drive.
In this step-by-step article, we're going to look at installing Lion on a drive or partition, either internally on your Mac or on an external drive. For those of you who want to create a bootable USB flash drive with Lion installed .
Perform a Backup
Before you begin the Lion installation process, it's a good idea to back up your existing OS X system and user data. Performing a clean install on a separate drive or partition shouldn't cause any type of data loss with your current system, but stranger things have happened, and I'm a firm believer in being prepared.At a minimum, make sure you have a current backup. For a bit more protection, make a bootable clone of your current startup drive.
To Make a Bootable Mac OS X 10.7 Lion Installer from a USB watch this video .
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