 "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 1TB AV SATA 6Gb s 3.5" Internal Hard Drive - 64MB Cache"@en Cache (WD10PURZ)"@en