WD Red Pro 6TB NAS 3.5 Internal Hard Drive – 7200 RPM Class SATA 6 Gb/s CMR 256MB Cache 5 Year WarrantyDesigned specifically with medium or large scale business customers in mind WD Red Pro drives are available for NAS systems. Engineered to handle high-intensity workloads in 24×7 environments WD Red Pro is ideal for archiving and sharing as well as RAID array rebuilding on extended operating systems such as ZFS or other file systems. These drives add value to your business by enabling your employees to quickly share their files and back-up folders reliably in your NAS solution.