If you would like to securely erase your data, click Security.Next to 'Format:', make sure Mac OS Extended (Journaled).In Disk Utility, from the left column, click your hard.Restart your computer, and immediately hold down command-r until the gray Apple logo appears. Reinstalling while erasing everything on your computer from the Apple menu, and install any available updates. When the installation is complete, select App Store.Click Install, and enter your Apple ID information if prompted. Follow the instructions on the screen, and then choose your hard disk. Click Reinstall OS X, and then Continue.If prompted, select your main language and then click the arrow.Restart your computer, and immediately hold down command-r until the gray Apple logo appears.Resolve an issue in which an admin user account could be missing after upgrading to OS X Lion.Resolve an issue that prevents transfer of your data, settings, and compatible applications to a new Mac running OS X Lion.Improve the reliability of Wi-Fi connections.Resolve an issue that may cause system audio to stop working when using HDMI or optical audio out.Address an issue that may cause the system to become unresponsive when playing a video in Safari.

The OS X Lion v10.7.1 Update is recommended for all users running OS X Lion and includes general operating system fixes that enhance the stability and compatibility of your Mac, including fixes that: Below is an overview of the most important changes. The update contains a number of improvements that, as Apple itself says, improves stability, compatibility and security and is therefore recommended. However, if the update function is used within Mac OS X itself, it may be lower fall out. The update is available for the desktop-, server-, mac mini 2011– and MacBook Air and Mac mini 2011execution and downloads range in size from 69 to 88MB. Apple has released the first update for Mac OS X 10.7, better known as Lion.

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