A disk drive. The disk drive includes a motor, a hub coupled to a spindle shaft of the motor, at least two disks each having a center hole and being coupled to the hub, and a spacer having a center hole. The spacer is disposed around the hub such that the hub is disposed within the center hole of the spacer; and, the spacer is sandwiched between and in contact with the two disks to define spacing between the disks. The spacer includes at least two conductive rings and the conductive rings are secured between the two disks. The spacer also includes a damping sheet configured to absorb vibration between the conductive rings, and a conductive ring-shaped spring having a spring characteristic in a radial direction of the disks to make a diameter variable. Moreover, the conductive ring-shaped spring is in contact with both of the two conductive rings.