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How to format a MacBook Air 2012? This laptop has no installation media.

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Why do you want to format it at all? – patrix Jul 14 '12 at 18:03
To get rid of any personal data in it. – lzm Jul 14 '12 at 18:08
up vote 9 down vote accepted

The MBA comes with a recovery partition already installed. Reboot and keep CmdR pressed during boot until the Apple icon is displayed in screen. This boots into Recovery Mode allowing you to repair and/or reinstall the MBA from scratch.

See OS X Lion: About Lion Recovery (HT4718) for details.

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Additionally, make sure that when you are erasing your drive, add a secure erase by clicking "Security Options" on the Erase tab. – Nathan Jul 14 '12 at 18:15
Or use FileVault 2 to encrypt the whole disk (something I recommend for laptops anyway) – patrix Jul 15 '12 at 5:58

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