Shipping now, the new 2.5-inch, 10,000 RPM, WD S25 with SAS 6 Gb/s interface hard drives offer IT professionals a more advanced array of ultra-reliable and efficient, high-performance storage, available in capacities of 300 GB, 450 GB, 600 GB, and 900 GB. The WD S25 line is designed for the most demanding applications such as online transaction processing and multi-tiered networked storage arrays.