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Silver 3.5 inch hard drive with Synology label, 147 mm long

Synology Inc.

Synology HAT5310-20T 20TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" internal hard drive

SKU CH-D5FH-G1G0K MPN HAT5310-20T

A 20 TB, 7200 RPM SATA enterprise drive with 512 MB cache and persistent write cache technology for 24/7 NAS workloads up to 550 TB per year

  • InterfaceSATA 6.0Gb/s
  • Capacity20TB
  • RPM7200 RPM
  • Cache512MB
  • UsageFor NAS systems
  • Form Factor3.5"

Options 20TB

  • 24TB
  • 20TB
  • 16TB
  • 12TB

Struck-through versions exist but are not stocked here.

  • 20 TB capacity supports large NAS storage pools
  • 7200 RPM spindle speed enables fast sequential data access
  • 512 MB cache buffers heavy multi-client workloads
  • Persistent write cache protects data during sudden power loss
  • Rated 2.5 million hours MTBF and 550 TB yearly workload for 24/7 reliability

Purpose-built NAS drive

The Synology HAT5310-20T is a 20 TB 3.5-inch hard drive engineered for Synology NAS systems. It spins at 7200 RPM with a 512 MB cache and connects through a SATA 6.0Gb/s interface. Firmware and DSM tuning raise multi-client sequential read performance by up to 23 percent.

Who it suits and who it does not

This drive suits administrators who need enterprise-grade reliability for 24/7 workloads up to 550 TB per year and a 2.5 million-hour MTBF rating. Persistent write cache technology protects data during sudden power loss. Buyers who need a non-SATA interface or a smaller form factor should look elsewhere.

The deciding specification

The SATA 6.0Gb/s interface determines whether this drive fits your bay and controller. Verify that your NAS or server accepts a 3.5-inch SATA device with a 26.1 mm height before purchasing.

Highlights

  • 20 TB capacity supports large NAS storage pools
  • 7200 RPM spindle speed enables fast sequential data access
  • 512 MB cache buffers heavy multi-client workloads
  • Persistent write cache protects data during sudden power loss
  • Rated 2.5 million hours MTBF and 550 TB yearly workload for 24/7 reliability

Specifications

BrandSynology
ModelHAT5310-20T
InterfaceSATA 6.0Gb/s
Capacity20TB
RPM7200 RPM
Cache512MB
UsageFor NAS systems
Form Factor3.5"
Height (maximum)26.1 mm
Width (maximum)101.85 mm
Length (maximum)147 mm
Shipping weight0.70 kg
Package size180 × 130 × 33 mm

Other versions of this model

2 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

Should I choose the 20TB capacity or a smaller HAT5310 model?

The 20TB model stores the most data per bay and handles up to 550 TB yearly workloads; pick a smaller capacity only if your NAS has fewer bays or your budget is tighter.

What does the 7200 RPM speed mean for my NAS performance?

7200 RPM combined with 512MB cache and DSM firmware tuning delivers up to 23% better sequential multi-client read throughput than standard drives in the same enclosure.

Does the SATA 6.0Gb/s interface limit real-world transfer rates?

The SATA 6.0Gb/s link caps burst transfers at 6.0 Gb/s, while sustained reads and writes are governed by the 7200 RPM platters and 512MB cache in your NAS.

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