GreenDrive II is Fantom Drives answer to energy. reduction and environmental responsibility by. utilizing up to 40% less power without sacrificing performance. The GreenDrive II employs variable speed disk. mechanisms that increase their rotational velocity in response to host demand, resulting in virtually no performance degradation vs. a 7200RPM disk. Additionally, no lead is used in any component. of the GreenDrive II, making it Restriction of. Hazardous Substances Directive (ROHS) as well as.