Wishlist Quick view WESTERN DIGITAL WESTERN DIGITAL WD6400AARS 640gb-5400rpm Sata-ii Hard drives $207.03 $142.78 WESTERN DIGITAL - CAVIAR GREEN 640GB 5400RPM (INTELLIPOWER) SATA-II INTERNAL HARD DISK DRIVE. 64MB BUFFER 3.5INCH FORM FACTOR LOW PROFILE (1.0 INCH) (WD6400AARS). REFURBISHED. CALL. Compare Add to Cart Add to Wishlist