Hard disk drive housing including at least one inlet, at least one outlet. The inlet is situated near spindle and above disk in hard disk drive. The outlet is situated near outside diameter of disk. When disk rotates, air pressure near the inlet is lower than air pressure near the outlet, causing a flow of air through the hard disk drive from the inlet to the outlet, tending to cool the hard disk drive. The inlet may include inlet filter. Outlet may include outlet filter. Manufacturing the housing by providing the inlet and the outlet. The disk cover as manufacturing product. Operating the hard disk drive containing the housing. The hard disk drive containing the housing, and manufacturing the hard disk drive. The hard disk drive as manufacturing product. A system containing at least one of the hard disk drives. Manufacturing the system, and the system as a manufacturing product.