ASUS Internal 24x DVD Rewritable SATA Optical Drive DRW-24B1ST Retail (Black) Internal 24x DVD-RW SATA Optical Drive E-Green - Innovative technology that helps conserve energy when drive is not in use; Decreases CO2 emissions OTS - Generates a optimal burning strategy automatically for the best burning quality E-Hammer - Ensure data security by permanently deletes the data on writable discs; Discs cannot be recovered or restored AVRS - Auto Vibration reducing system technology to minimize the vibration caused by the internal components; Ensures high readability and payability