Selling my macbook air need some help

[Redrum509]

I'm selling my 2011 macbook air to upgrade. I was wondering how I factory reset the air? DO I have to re-install the OS? Thanks.

 

[3dflyboy1]

I'm selling my 2011 macbook air to upgrade. I was wondering how I factory reset the air? DO I have to re-install the OS? Thanks.

Hold Cmd-R when booting. Erase the SSD in disk utility, then go back to the main restore menu and install the OS.

 

[05GT]

I'm selling my 2011 macbook air to upgrade. I was wondering how I factory reset the air? DO I have to re-install the OS? Thanks.

http://kevin.kevandisa.com/2013/04/how-to-restore-macbook-to-factory-settings/