SINGLE BULK PACK WD VelociRaptor 600GB SATA 6Gb/s 2.5-inch Hard Drive. VelociRaptor hard drives offer twice the capacity of the previous generation while delivering higher performance and cool quiet operation for blade servers, workstations, and low-end servers. With a superbly engineered combination of 10,000 RPM spin speed, SATA 6 Gb/s interface and a 32 MB cache, these drives are truly an evolution in performance.