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Silver 3.5 inch internal hard drive with Synology HAT3320-20T label

Synology Inc.

Synology HAT3320-20T 20TB 7200 RPM 3.5" internal hard drive

SKU CH-D6JP-ERTHQ MPN HAT3320-20T

A 20 TB 3.5" internal hard drive with a 7200 RPM spindle, 1.2 million-hour MTBF and 180 TB yearly workload rating for always-on NAS use

  • Total capacity20 TB
  • Interface typeSATA
  • Form factor3.5 in (8.89 cm)
  • Rotational speed7,200 RPM
  • Cache memory1 GB
  • Max height4

Capacity 20TB

  • Reliable always-on operation with up to 1.2 million hours MTBF
  • Handles heavy workloads at 180 TB per year rating
  • Validated through over 500,000 hours of stringent testing
  • Conventional magnetic recording ensures consistent performance
  • Firmware updates managed directly within Synology DSM

Purpose-built NAS storage

The Synology HAT3320-20T is a 20TB 3.5-inch internal hard drive spinning at 7200 RPM with a 1GB cache and SATA interface. It is engineered for always-on operation in Synology NAS systems, offering 1.2 million hours MTBF and a 180 TB per year workload rating validated by over 500000 hours of testing.

Best for Synology NAS owners.

This drive suits administrators who need high-capacity, reliable storage inside a compatible Synology enclosure where firmware updates are handled directly through DSM. Builders using non-SATA platforms, external enclosures without SATA backplanes, or systems that cannot accommodate a 3.5-inch form factor should look elsewhere.

180 TB yearly workload rating

The 180 TB per year workload rating is the single specification that defines whether this drive matches the intended write intensity. Environments exceeding that annualised write volume should consider higher-rated enterprise drives, while lighter workloads will operate well within the rated envelope.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $520.99
Pricier than about 90% of the 4,938 comparable items (median $107.99).
Total capacity 20 TB
Higher than about 94% of the 2,372 comparable items (median 2 TB).
Price per TB $26.05 per TB
Cheaper than about 88% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSynology
Model nameHAT3320-20T
Part numberHAT3320-20T
Total capacity20 TB
Recommended useFor Daily Computing
Performance
Rotational speed7,200 RPM
Storage
Cache memory1 GB
Ports & slots
Interface typeSATA
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight0.68 kg
Package size146 × 102 × 25 mm

Other versions of this model

5 more in the same range

Questions about this item

Will the 3.5-inch, 5.7-inch long drive fit my standard desktop bay?

The drive follows the 3.5-inch form factor and measures 5.7 inches long, matching standard internal desktop bays and most NAS trays.

Does the SATA interface need any special driver or firmware step during installation?

Connect the SATA data and power cables, then update firmware through Synology DSM if the drive is used in a Synology system.

How long is the drive rated to last under a 180 TB yearly workload?

The 1.2 million hour MTBF and 180 TB per year workload rating are designed for continuous always-on operation.

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