Western Digital Caviar 640GB SATA Hard Drive with 16MB Cache for $58.89 Shipped

Western Digital Caviar 640GB 7200RPM SATA Hard Drive with 16MB Cache for $58.89 shipped.  Here is a screenshot for your reference.  This drive uses a high-density 2-platter design for better performance while reducing power consumption.  Note that it comes in OEM packaging, which means no pretty retail box and marketing materials but is otherwise identical.