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