3.5" (SAS & SATA) Enterprise. 2.5" (SAS & SATA) Enterprise. Hitachi Ultrastar HUA723030ALA640 3TB 7200 RPM 64MB SATA 3.0Gb/s 3.5" Hard Drive. WD6400AAKS Western Digital CAVIAR BLUE 640GB 7200RPM 3Gb/s 3.5" SATA Hard Drive.
eBay