Seagate ST18000NT001 18TB IronWolf Pro 3.5' SATA NAS Hard Drive NAS-optimised HDDs — offering performance, capacity, and high workload with CMR technology and AgileArray™ firmware. Always on, always accessible, all-CMR portfolio engineered to deliver 24×7 performance, reliability, and dependability in multi-bay, multi-user commercial and enterprise RAID storage solutions. Capacity: 18TB - Max. Sustained Transfer Rate OD: 285MB/s Interface: SATA 6Gb/s Drive Design: Helium Workload Rate Limit: 550 - Cache (MB): 256 RPM: 7200 Sector Size: 512E Drive Bays Supported: Unlimited MTBF: 2.5 Million Hours Recording Technology: CMR - ST18000NT001 Manufacturer Warranty: 5 Years Limited Warranty