WD RE 3 TB Enterprise Hard Drive: 3.5 Inch, 7200 RPM, SATA III, 64 MB Cache - WD3000FYYZ (Old Model) Bullet - 5 years warranty from seller

Western digital RE 3 TB Enterprise Hard Drive: 3.5 Inch, 7200 RPM, SATA III, 64 MB Cache - WD3000FYYZ (Old Model) Bullet - 5 years warranty from seller

Western Digital WD4000FYYZ ENTERPRISE 4TB 7200RPM 64MB Cache SATA 6.0Gb/s 3.5 internal hard drive

Western Digital WD Bulk WD10EURX 1TB AV GP SATA 6Gbs 3.5", 1 TB