![Amazon.com: Western Digital Caviar Blue 640 GB Bulk/OEM Hard Drive 3.5 Inch, 16 MB Cache, 7200 RPM SATA II WD6400AAKS : Electronics Amazon.com: Western Digital Caviar Blue 640 GB Bulk/OEM Hard Drive 3.5 Inch, 16 MB Cache, 7200 RPM SATA II WD6400AAKS : Electronics](https://m.media-amazon.com/images/I/717YW0od0zS.jpg)
Amazon.com: Western Digital Caviar Blue 640 GB Bulk/OEM Hard Drive 3.5 Inch, 16 MB Cache, 7200 RPM SATA II WD6400AAKS : Electronics
![Amazon.com: Western Digital Caviar Blue 640 GB Bulk/OEM Hard Drive 3.5 Inch, 16 MB Cache, 7200 RPM SATA II WD6400AAKS : Electronics Amazon.com: Western Digital Caviar Blue 640 GB Bulk/OEM Hard Drive 3.5 Inch, 16 MB Cache, 7200 RPM SATA II WD6400AAKS : Electronics](https://m.media-amazon.com/images/I/51tNXsrfLlL.jpg)
Amazon.com: Western Digital Caviar Blue 640 GB Bulk/OEM Hard Drive 3.5 Inch, 16 MB Cache, 7200 RPM SATA II WD6400AAKS : Electronics
![Western Digital Scorpio Blue 640GB 2.5" Hard Drive 5400RPM SATA HDD WD6400BEVT 718037737973 | eBay Western Digital Scorpio Blue 640GB 2.5" Hard Drive 5400RPM SATA HDD WD6400BEVT 718037737973 | eBay](https://i.ebayimg.com/images/g/O3EAAOSwE~1cB8Pr/s-l500.jpg)
Western Digital Scorpio Blue 640GB 2.5" Hard Drive 5400RPM SATA HDD WD6400BEVT 718037737973 | eBay
![Refurbished: Western Digital WD Green WD6400AAVS 640GB 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive - Newegg.com Refurbished: Western Digital WD Green WD6400AAVS 640GB 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive - Newegg.com](https://c1.neweggimages.com/ProductImage/22-136-791-02.jpg)
Refurbished: Western Digital WD Green WD6400AAVS 640GB 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive - Newegg.com
![WD6400AAKS Western Digital Caviar Blue 640GB 7200RPM SATA 3Gbps 16MB Cache 3.5-inch Internal Hard Drive WD6400AAKS Western Digital Caviar Blue 640GB 7200RPM SATA 3Gbps 16MB Cache 3.5-inch Internal Hard Drive](https://cdn11.bigcommerce.com/s-oq7ydatnxi/images/stencil/1280x1280/products/4288/5378/WD6400AAKS-lg__79841.1669703075.jpg?c=1)