 "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 Blue WD40EZRZ - hard drive 4 TB SATA 6Gb/s" " WD 6Gb/s Internal Desktop Hard Drives CDW.com
"This hard drive offers stunning capacity and ensures your colors never fade." 