How About a Hard Drive that Spins at 20,000 RPM?

Western Digital is going for speed, baby. Looking to take on the SSD market, they are going to follow up their 10,000 RPM hard drive, called the VelociRaptor, with a model that spins at 20,000 RPM. No real details to share other than the speed info, and it has me wondering how this will affect everything from battery life to Earth’s gravity.