Synology HAS5300-12T 12TB 7200RPM 3.5″ SAS Enterprise Hard Drive

Overview

The Synology HAS5300-12T is a 3.5-inch SAS enterprise hard disk drive designed for deployment in Synology high-performance storage platforms. It is used by storage administrators operating rackmount storage servers and SAN systems that require consistent throughput, predictable RAID behavior, and continuous 24/7 availability. The drive belongs to the Synology HAS5300 series, which is engineered specifically for enterprise NAS and IP SAN environments where multiple drives operate simultaneously under heavy workloads.

The drive provides 12 TB of storage capacity and operates at 7200 RPM, delivering sustained sequential transfer speeds up to 254 MB/s through a SAS 12 Gb/s interface. It includes a 256 MB cache buffer to support sustained data operations and maintain stable performance during large sequential transfers and RAID rebuild processes. These characteristics make it suitable for multi-bay enterprise storage systems handling backup repositories, virtualization storage, and large file workloads.

From a reliability perspective, the drive supports a 550 TB/year workload rating and a 2.5 million hour mean time between failures (MTBF), allowing it to operate reliably in environments with continuous disk activity. Persistent write cache technology and optimized firmware help maintain data integrity and reduce RAID rebuild time during degraded array conditions.

This drive is typically installed in enterprise Synology storage platforms such as rackmount storage servers used for virtualization clusters, surveillance storage, backup repositories, and large-scale file storage. In these deployments, multiple HAS5300 drives are grouped into RAID arrays to deliver scalable storage capacity and maintain predictable sequential throughput across the storage pool.

A practical deployment example includes a rackmount storage system configured with RAID 6 where multiple HAS5300-12T drives provide shared storage for backup infrastructure or virtual machine datastores. In such environments, consistent throughput, large capacity, and predictable rebuild performance are more important than burst performance.

The HAS5300-12T should not be used in systems that only support SATA drives or entry-level NAS platforms without SAS controllers. Because it uses a SAS interface, it requires enterprise storage systems equipped with compatible SAS backplanes or controllers.

Technical Specifications