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The 18TB UltraStar DC HC550 7200 rpm SATA III 3.5 Internal HDD from WD is a high-performance large-capacity drive designed for enterprise environments that have intensive data and storage needs. This drive has a storage capacity of 18TB and a 3.5 form factor with a SATA III 6 Gb/s interface rotational speed of 7200 rpm and 512MB cache that help to ensure uninterrupted data transfers at speeds of up 269 MB/s. As a professional-grade drive it has an MTBF rating of 2.5 million hours an Annualized Failure Rate AFR of 0.35% 600000 load/unload cycles an error rate of 1 in 101 non-recoverable bits read and a workload of up to TB per year plus WDs HelioSeal technology which replaces the air inside the drive with helium. This allows for increased efficiency reliability and capacity thanks to reduced vibration improved areal density cooler operating temperatures and reduced power requirements.