Western Digital internal hard drives are noted for their robustness, reliability, and affordability. Our Western Digital WD6400AAKS-75A7B2 Western Digital Caviar Blue 640GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive has been designed to meet the requirements for both medium and enterprise storage. It offers excellent performance with a great capacity and higher rotational speed, as well as a large cache which ensures data access is quick and smooth. In addition, our products are able to adapt to expanding virtual environment, fit into existing budgets, and make sure that data is ready when it's needed. At Western Digital we strive to supply a varied selection of cutting-edge Hard Drive products that satisfy the needs of all storage markets, whilst continuing to push Hard Drive technologies forward in order to surpass customer expectations.