Western Digital VelociRaptor Enterprise Grade 2.5inch SATA Hard Drive, 1TB, SATA 6Gb/s, 64 MB Cache, 10,000 RPM NOTE: Package comes with "2.5" to 3.5" conversation mounting bracket" for this drive install into desktop 3.5" hard drive bay. Not require on some servers. The evolution of 10,000 RPM SATA technology WD 2.5" 1TB 10K RPM 64MB Cache cache hard drives offer maximum speed, low power consumption, and cool operation perfect for blade servers, performance enthusiast systems, workstations, and low-end servers. Available in a 2.5-inch form-factor for use in enterprise applications or designed into a 3.5-inch mounting bracket for installation in high-performance desktop systems. (This 10K RPM 2.5" SATA hard drive, NOT designed for 2.5" laptop, the drives is too thick to fit on 2.5" laptop hard drive bay. ) Engineered for maximum speed! WD 1TB 2.5" 10K RPM 64MB Buffer SATA 6.0Gb/s hard drive, the newest member of our unique class of 10,000 RPM SATA3 hard drives, combines a SATA 6 Gb/s interface and 64 MB cache to deliver performance that's up to 35% faster than its speedy older brother. Killer speed Built on the performance bloodlines of these 10,000 RPM drives, with SATA 6 Gb/s interface, and 32 MB cache deliver mind-bending performance. Rock-solid reliability Designed and manufactured to mission-critical enterprise-class standards to provide enterprise reliability in high duty cycle environments. With 1.4 million hours MTBF, these drives have the highest available reliability rating on a high capacity SATA III drive. Double the capacity State-of-the-art technology packs twice the capacity per disk resulting in up to 450 GB of high-performance storage space in this enterprise-class 2.5-inch drive. Small form factor This ultra fast 2.5-inch hard drive is engineered to fit into blade servers and other desktop PC storage