WD Green Mobile Hard Drives Cool, quiet operation for efficient eco-conscious computing. Ideal for custom-built external enclosures & other applications for which low noise & low heat are beneficial * Cannot be used in laptop or notebook computers. Designed for PCs & custom external enclosures. Consult system specifications for maximum allowable drive height before attempting to install. Benefits: Cool & quiet Reduced power consumption Eco-conscious No Touch Ramp Load technology 2 Year Manufacturer Warranty These earth-friendly hard drives are ideal to be used whenever energy efficiency is needed.