 "Western Digital Red 6 TB Internal HDD" " Western HDD - WD60EFRX 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 Blue 4TB Desktop Hard Disk Drive - 5400 RPM SATA 6 Gb/s 64MB Cache 3.5 Inch WD40EZRZ"@en-US "Data Storage Page | Laptops Outlet Direct"@en-US
"WD Blue PC Hard Drives. High Capacity, Proven Reliability. WD expands their award-winning desktop and mobile storage lineup with WD Blue PC hard drives. Extensively tested and built to WD's high standards, WD Blue offers a wide variety of capacities-ranging from 250 GB to the massive 6 TB-in both desktop and mobile models. Drive WD Blue with confidence-our colors never fade."@en-US 