The market has a hard disk "220V Cooling Fan" sale, buy directly mounted on the bottom of the hard disk can be, but does not know this is hard fans just killer. Such hard fans are usually made some sort of small manufacturers, the quality is not necessarily qualified. Because "220V Cooling Fan" in the rotation will produce vibrations, even if people can not feel the vibrations, but for high-speed operation of the hard disk, it can cause invisible damage. Although short-lived fad that will not be reflected vibration injury, but long-term accumulated, the hard disk will appear bad sectors, data loss and other problems, it can not be such a "220V Cooling Fan" install a hard disk, at least in the fan and hard drive damping pads should be installed between, or let go some distance between them.