Turn on your PlayStation 3 and open the "Settings" menu on screen.
Scroll down to and select the option reading "System Settings."
Choose the option reading "Format Utility." Select the listing for the PlayStation 3 hard drive on screen and press "X." This will delete the master user account on your PlayStation 3 game console. This will wipe all data from the hard drive including account settings, game data, save games and any content you have downloaded from the PlayStation Network Store.