The Ubiquiti Enterprise 3.5" HDD (UACC-HDD-E-16TB) is a high-capacity, high-reliability 16TB SATA hard drive purpose-built for demanding enterprise storage applications, including UniFi Protect video surveillance and UNAS network-attached storage . Engineered for 24/7 operation, this drive boasts a workload rating of 550TB per year and a class-leading mean time between failures (MTBF) of 2.5 million hours, ensuring continuous and secure data integrity . With its SATA 6Gb/s interface and 7200 RPM spindle speed, it provides the fast, reliable access required for high-density storage environments .