Currently Being ModeratedFeb 18, 2013 1:24 PM (in response to damienf88)
The article is very cursory, but be sure to read through to the end. Unfortunately the link there is broken, so use this one: Disk Utility.
If it is new I suggest you contact AppleCare: 800-MY-APPL (in the US). Telephone support is free for the first 90 days.MacBooks iMacs iPads AirPorts, OS X Mountain Lion, 28 years Apple!