While a tray moves into a disk drive, a clamper and a turntable are used to clamp a disk. While the tray is moving into the disk drive without a disk thereon, the clamper and turntable hit with each other, which generates an uncomfortable noise. The apparatus for reducing the noise is an improved clamper with holes thereon. Alternatively, the clamper is replaced by a clamping part, which includes a metal plate and a plastic plate. The plastic plate has a holder, which clips tight an extension of the metal plate. Therefore, the noise, which is generated from the collision of metal plate and the turntable, is reduced.