How to Do a Clean Install of OS X Yosemite

Apple released OS X Yosemite to the masses on Thursday as a free upgrade, so plenty of users are likely already busy preparing to install the new operating system. As with OS X Lion, OS X Mountain Lion and OS X Mavericks, Apple makes it easy for users to install the upgrade by downloading Yosemite from the App Store and running the installer. See also: OS X Yosemite Review: An Equal Partner for iOS 8 For most users, this is the best way to upgrade because it keeps your data and existing programs...