The Synology HAT3300 Plus Series is a 3.5-inch SATA III internal hard drive with a storage capacity of 4 TB, specifically designed for Synology NAS systems in home and small office environments. It utilizes conventional magnetic recording technology (CMR) for consistent write performance and data integrity throughout its lifespan. Designed for 24/7 operation, this hard drive has a workload rating of 180 TB per year and a mean time between failures (MTBF) of 1.2 million hours, offering improved durability compared to standard desktop hard drives. It undergoes extensive compatibility and stress testing exceeding 500,000 hours to reliably handle high uptime and multi-user demands. The hard drive supports seamless firmware updates via Synology DiskStation Manager (DSM), allowing for easy maintenance without physical removal. With dimensions of 101.6 mm in width, 146 mm in length, and 26.1 mm in height, it weighs approximately 670 g. It operates at a speed of 7200 RPM, features a 256 MB cache, and has an average latency of 4.17 ms. The interface is SATA III with a data transfer rate of up to 6 Gb/s and supports advanced error recovery controls. This hard drive is ideal for applications requiring reliable storage, such as file sharing, backups, and surveillance, and is validated for use in Synology storage systems to ensure stable performance and long-term reliability.