Hard Drive 6TB Western Digital WD60EZRZ 3.5,Amazon.com: Western Digital 6TB WD Blue PC Internal Hard Drive - 5400 RPM Class, SATA 6 Gb/s, 64 MB Cache, 3.5,WD Blue 6TB Desktop Hard Disk Drive 5400 RPM 3.5,WD6004FZBX-SPC9FA0 Western Digital Black 6TB 7200RPM SATA 6Gb/s 3.5-inch Hard Drive,Amazon.com: WD Green 6TB 3.5-Inch SATA 6.0Gb/s IntelliPower 64MB Cache Hard Drive (WD60EZRX) : Electronics