A rubber bumper around the top cover absorbs the force of side bumps. The corners are 50 percent stronger, to reduce damage when dropped at an angle. The bezel is thicker, to protect the LCD panel, and a stronger rear cover reduces accidental LCD damage. The hinges and brackets have been strengthened, to last 50,000 cycles and to withstand more force to the cover. Reinforced ports and a reduced gap between anchored keys help prevent accidental damage from a bored child's exploring fingers. This is one tough machine.