WD Red Plus internal HDDs are designed to handle workloads for power users and small to medium business NAS environments. WD Red Plus drives deliver the speed and capacity required to store, protect and share growing amounts of data in mid-sized RAID-optimized NAS systems with increased power efficiency. This drive has a capacity of 3TB and uses CMR technology with a 256MB cache. It features a 3.5-inch form factor and a Serial ATA III interface, operating at 5400 RPM.