The 6TB Red Plus 5400 rpm SATA III 3.5" Internal NAS HDD from WD is built to handle the workloads of RAID-optimized NAS systems with up to 8 drive bays, including home offices and power users, small to medium businesses, and consumer and commercial NAS systems. This 6TB drive operates using a SATA III 6 Gb/s interface, a 256MB cache, and a rotational speed of 5400 rpm, which all help to ensure uninterrupted data transfers with a rate of up to 180 MB/s.