 "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." 
 "ST2000DM001 Seagate 2TB 7200RPM SATA 6.0 Gbps 3.5 64MB Cache Barracuda Hard Drive"
 General Information: Brand Seagate Part # ST2000DM001 Category Internal Hard Drive Condition New Availability In Stock Technical Specifications: Interface SATA 6.0 Gbps Capacity 2TB Speed 7200 RPM Cache 64 MB Size 3.5-inch