 "Western Digital Red 2 TB Internal HDD" " Western HDD - WD20EFRX Desktop Hard Drives CDW.com
"WD's exclusive NASware technology, built into every WD Red hard drive, improves NAS storage performance by reducing common hard drive concerns in NAS systems including concerns for things like compatibility, integration, upgradeability, reliability and cost of ownership that are experienced with a hard drive designed for desktop computers." 
 "WD Red Pro 4TB 7200rpm SATA 6Gb/s 128MB Cache HDD OEM (WD4002FFWX)"@en "▷ WD (WD400… | OcUK"@en
"4TB Capacity, 3.5 inch, SATA 6GB/s Interface, IntellliPower 7200RPM Spin Speed, 128MB Cache, 5 Year Warranty"@en 