Western Digital's RE2-GP hard drive
 

When we looked at Western Digital's "GreenPower" Caviar GP last month, we heralded the drive's low noise levels and frugal power consumption. Given the GP's slower spindle speed and energy-efficient billing, those results were largely expected. What surprised us, however, was how well the GreenPower Caviar handled demanding multi-user loads. It's not often that you find low power consumption with strong performance riding shotgun.

http://techreport.com/articles.x/13578