Instructions
Open the XMB option labeled "Settings" on your PlayStation 3. The "XMB" is what the main menu on the PlayStation 3 is officially referred to by Sony documentation for the console.
Select "System Settings."
Choose "Format Utility."
Select "Yes" to confirm the operation.
Select the icon for the PlayStation 3 hard disk drive. Select "Yes" to confirm the operation a second time. The PlayStation 3 hard disk drive will be formatted, and any issues resulting from incorrect, corrupt or obsolete system files will be corrected.