Western Digital Red Pro 3.5" 7200rpm 512MB SATA 6Gb/s (WD181KFGX) - 18TB

Available in capacities ranging from 2 to 22TB(1) | (1) 1GB = 1 billion bytes and 1TB = 1 trillion bytes. Actual user capacity may be less depending on operating environment. For RAID-optimized NAS systems with unlimited number of bays Rated for 550TB/yr workload rate(2) | (2) Annualized Workload Rate = TB transferred x (8760 / recorded power-on hours). The maximum rated workload is specified for operating at typical temperature of 40C. Workload Rate will vary depending on your hardware and software components and configurations. Designed to handle the demands of high-intensity 24x7 multi-user NAS environments Western Digital partners with a wide range of NAS system vendors for extensive testing to ensure compatibility with most NAS enclosures