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After the partition is erased, choose Quit Disk Utility from the Disk Utility menu.

A dialog box appears asking if you want to erase the partition: click Erase.

If you have installed Microsoft Windows using Boot Camp, or have multiple partitions, this procedure will erase the partition you select. Important: This step will completely erase your hard drive.

Select a volume to erase (usually called Macintosh HD).

Click the Utilities menu, the choose Disk Utility.

Select a language, then press the right arrow key.

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If your are using a wireless mouse, a mouse icon should appear asking you to turn the mouse on so that the computer can discover it. With just a few clicks, multiple gigabytes of unneeded files can be removed.' - TechRepublic.

Alternatively, press and hold the Option key at startup to select the volume containing the installer. Attention: Some software were taken from. All brands and logos are property of their owners.

Legal information: All software on are free of charge type. The computer will start up using the Install media. Description:TWAIN Driver / CaptureOnTouch for Canon DR-2510CTWAIN Driver / CaptureOnTouch for Mac OS X 10.3.x, Mac OS X 10.4.x, Mac OS X 10.5.x, Mac OS X 10.6.x.

Press and hold the 'C' key while the computer starts up.

Insert the Mac OS X Install DVD into the optical drive, or insert the MacBook Air Software Reinstall Drive into the USB port.

Important: This procedure will completely erase your hard drive. Mac OS X v10.6 Snow Leopard: How to Erase and Install If you have completed the applicable steps in the article you came from, the next step is going to be to erase the hard drive to prepare it for re installation of the Operating System: It sounds like you are wanting to clear your personal info from your computer before you sell it.

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