ASUS Internal 8x Blu-ray Combo SATA Optical Drive BC-08B1ST (Black) Internal SATA 8x Blu-ray Combo Optical Drive Disc Encryption - password protects an entire disc with 128-bit encryption E-Green - Innovative technology that helps conserve energy when drive is not in use; Decreases CO2 emissions TTHD - True Theater High Definition technology delievers unsurpassed quality for DVD movies on PC-based hometheater system OTS - Generates a optimal burning strategy automatically for the best burning quality