New in Mac OS X Lion is The Recovery System.  What this does, is allows you to reinstall Mac OS X from your hard drive should you drive somehow get damaged or corrupted.  Using the Recovery System, you can also run disk repair on your hard disk.  In the past, you needed to start OS X from a boot disk if you wanted to run disk repair on your hard drive – no more.  Now, all you need to do is to run the  Recovery System utility as your machine is booting up.

To launch the Recovery System, hold down the Command and R keys as your system is restarting.  You will be presented with the “Mac OS X Utilities” window, which contains four options:

1. Restore from Time Machine Backup – replaces the contents of your hard drive with the last Time Machine Backup
2. Reinstall Mac OS X – Installs OS X on your Mac
3. Get Help Online – Brings you to Apple’s support page.
4. Disk Utility – launches the Disk Utility application

You can also access the Recovery System by pressing the Option key during system startup.

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