Amazon.com: WD RE4 500 GB Enterprise Hard Drive, 3.5 Inch, 7200。Amazon.com: WD RE4 500 GB Enterprise Hard Drive, 3.5 Inch, 7200。Western Digital RE4 WD5003ABYX 500GB 64MB Cache SATA 3.0Gb/s 3.5。 Western WD5003ABYX RE4 7.2K Enterprise SATA Hard Disk Drives