AnandTech checked out one of the fastest hard drives on the market: "Thus, Western Digital will have two different models of basically the same drive in the market place. The WD1500ADFD will be primarily targeted as an entry-level alternative in the enterprise market with the WD1500AHFD being targeted to the computer enthusiast and gaming user. The Raptor X model differs cosmetically from its parent by offering a transparent cover over the spindle and platter section of the drive. The cover was designed from a special grade of crystalline polycarbonate with a unique ESD-dissipative coating. The combination of this cover and the conductive frame design will protect the read/write heads from potentially damaging static discharge.."



Link: AnandTech