Western Digital S25 - Hard drive - 450 GB - internal - 2.5" SFF - SAS 6Gb/s - 10000 rpm - buffer: 32 MB, P/N WD4500BKHG These 2.5-inch SAS drives offer the powerful combination of enterprise class performance and reduced power consumption required for demanding high-performance computing and mission critical environments such as data centers, database transaction processing, and rack, tower, and blade servers.WD S25 delivers 6 Gb/s transfer rates and SAS 2.0 feature set delivering sustained sequential data rates of 155 MB/sec, and fast average read seek times of 3.8 ms or less. This 2.5-inch SAS drive requires less than 8 watts to operate. And its small form-factor, 70 percent smaller than 3.5-inch drives, allows for more system airflow resulting in lower cooling costs. Ultra-fast SAS storage Low power consumption Industry's highest reliability rating Environmentally conscious NoTouch ramp load technology Rotary Acceleration Feed Forward (RAFF)