HPE 861686-B21 Proliant Hard Drive, Large Form Factor: 3.5 inches, Capacity: 1TB, Interface Type: Serial ATA, Connector: 22-Position Serial ATA (SATA) Plug, Data Transfer Rate: 6G = 6Gb/sec (750 MB/s), Spindle Speed: 7200RPM, Native Command Queuing: Supported, Bytes/Sector: 512, Average Seek Time: 8.0ms, Tray: LPC (Low Profile Carrier). HP SATA Hard Drives are designed for the reliability and larger capacities demanded by today's entry server and external storage environments.