SAT5221-3840G Synology 3.84TB SATA 6Gbps Solid State Drive (SSD)

SAT5221-3840G Overview

The Synology SAT5221‑3840G is a 3.84 TB enterprise‑grade SATA Solid State Drive designed to meet the demands of professional storage systems, especially Synology NAS units and server environments that require consistent performance, endurance, and reliability. Built with a SATA 6 Gb/s interface and a 2.5‑inch, 7 mm form factor, this SSD fits into standard internal drive bays and delivers sequential read and write speeds up to approximately 500 MB/s, which is near the theoretical limit of the SATA interface. It also offers strong random access performance — around 90,000 IOPS for reads and 30,000 IOPS for writes — to help keep latency low during mixed workload operations such as virtualization, database access, or general file serving.