Hard drive SYNOLOGY HAT5320 NAS 20TB SATA 3.5", 7200 RPM

SYNOLOGY HAT5320 20TB is a 3.5" enterprise NAS hard drive, aimed at serious NAS configurations and long-term data storage. With a capacity of 20TB and a rotational speed of 7200 rpm, the drive is suitable for large arrays, backup servers, and business environments where both speed and reliability matter. The SATA 6 Gb/s interface and maximum sustained transfer speed of 295 MB/s place it in the upper class for mechanical drives, especially for NAS. On top of that come the enterprise features – Helium-sealed construction, MTBF 2,500,000 hours, and a 60-month warranty.

What you get

You get an internal 3.5" NAS HDD from Synology's enterprise series, optimized specifically for use with Synology NAS/DSM. 20TB capacity means serious space for backups, virtual machines, media libraries, or video surveillance, without having to fill each bay with separate small drives. The speed of 295 MB/s sustained transfer helps with large file copying, replication between NAS devices, or RAID array rebuilds. The Helium-sealed design reduces internal resistance and vibrations, which is an important plus in multi-drive enclosures, and the workload of up to 550 TB/year and 24/7 certification show that this drive is built to run continuously. Additional convenience is the support for one-time firmware updates via DSM, so you can keep the firmware up to date directly through the NAS interface, without manual exercises.

• Capacity 20TB – gives you huge space for backup, file server, or multi-camera video surveillance in a single drive.
• Enterprise Series 3.5" SATA HDD – positioned for professional and intensive use in NAS environments, not as a regular desktop drive.
• 7200 rpm and maximum sustained transfer speed of 295 MB/s – faster sequential operations, faster backups, and RAID rebuilds.
• 512 MB cache memory – stabilizes performance under load with multiple requests and improves response during file operations.
• Helium-sealed construction and 512e sector format – lower vibrations and optimal compatibility with file systems and applications.
• Designed for 24/7 operation and workload up to 550 TB/year – suitable for constantly loaded NAS, backup, and storage servers.
• Optimized for Synology NAS/DSM + firmware updates via DSM – better integration, monitoring, and easy maintenance directly from the NAS interface.
• MTBF 2,500,000 hours and 60 months warranty – an indicator of high reliability and long-term operation.
• Active Idle consumption ~4.35 W – reasonably low for a 20TB enterprise drive, which is important in multi-drive configurations.

Who it is suitable for

This drive is suitable if you are building or expanding a serious NAS – for a small/medium office, studio, backup storage, private cloud, or a video surveillance system that runs 24/7. It makes particular sense if your NAS is Synology and you want an officially optimized and supported HDD. If you are looking for a cheap drive for a rarely used home computer, this is more than your needs – here you pay for uptime, reliability, and integration.

The combination of 20TB capacity, enterprise durability, and specific optimization for Synology NAS/DSM makes HAT5320 a strong choice when your data is more than just "files" and you want a medium designed to keep them safe for a long time and without surprises.