Seagate SkyHawk 1TB 6Gb/s 5900 rpm Surveillance Hard Drive

Western Digital Caviar Blue 3TB 5400RPM SATA 3/SATA 6.0 GB/s 64MB

Western Digital Red 1TB NAS Hard Disk Drive - 5400 RPM - 6 Gb/s 64MB Cache

WD Purple 3TB Surveillance Hard Drive 5400 RPM SATA 6 Gb/s 64MB