"Western Digital may be marketing their new VelociRaptor family of high-speed hard drives as enterprise-class hard drives but they are also very popular with hardware enthusiasts who just cannot resist their 10,000 RPM spindle speed. Everything just seems a little faster when you use a hard drive that spins at such a high speed.
To cater to this exclusive group of enthusiasts, Western Digital first introduced the Raptor and Raptor X hard drives with capacities of 36 GB to 150 GB. These Raptors have now evolved into the next-generation Western Digital VelociRaptor hard drives, that not only boast twice the storage capacity but also managed to do it in a much smaller 2.5" drive form factor!
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Source: TechARP