ASUS Internal 24X SATA Optical Drive DRW-24B3ST/BLK/G (Black) E-green - automatically optimizes your drive's power consumption. E-hammer - allows you to permanently delete The data on writable disc (CD-R and DVD-R) formats. Optimal tuning strategy - cover both media and drive variations as well as operating temperature, optimal write speed detection, improve write quality. Auto vibration reducing system - designed to reduce vibration and noise induced by unbalanced mass of rotating machinery.