Methods and media for pre-mastering in preparation for recording data files to optical media are provided. The screw rod unit is composed of a transmission mechanism and a screw rod, in which the screw rod is pivotally mounted on the platform in a manner that when the platform is driven to move, the moving platform will activate the transmission mechanism for bringing along the screw rod to rotate. The scrubbers may include soft covers, and can carry out the cleaning by dry rubbing or with the help of high-boiling solvents for the matrix substances.