Reference 1.1 About OS X YosemiteWhat’s New in OS X YosemiteIntegration Through StandardsReference 1.2 Installation ChoicesRunning OS X Yosemite with No Significant ProblemsRunning OS X Yosemite but Has Significant ProblemsRunning OS X v10.6, OS X Lion, OS X Mountain Lion, or OS X Mavericks with No Significant ProblemsRunning OS X v10.6, OS X Lion, OS X Mountain Lion, or OS X Mavericks but Has Significant ProblemsRunning a Version of OS X Prior to v10.6 and You Want to UpgradeReference 1.3 Before Upgrading a Previous SystemVerifying Installation RequirementsPreparing for an Upgrade InstallationKeeping Up to DateReference 1.4 Preparing the System DiskNew OS X Installation (aka Clean Install)Understanding Partitioning OptionsReference 1.5 Upgrading and InstallingAcquiring the OS X InstallerNewer Mac SystemsInstall OS X YosemiteReference 1.6 Installer TroubleshootingGeneral OS X Installer TroubleshootingThe OS X Installer LogExercise 1.1 Prepare a Mac for UpgradeUse System Information (or System Profiler) to Check Hardware, Firmware, and Application CompatibilityDocument Network SettingsBack Up Your DataExercise 1.2 Upgrade to OS X YosemiteUse the App Store to Download the InstallerUpgrade Your Computer to OS X YosemiteExercise 1.3 Erase a Mac System and Install OS X YosemiteStart Up from Recovery or an Install DiskErase Your Computer’s Disk DriveInstall OS X YosemiteExercise 1.4 Verify System InstallationExamine the Installer Log