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Silver 3.5 inch SATA hard drive rectangular metal casing

Synology Inc.

Synology Inc. HAT3300-4T 4TB 3.5" SATA internal hard drive

SKU CH-4GX8-P64RE MPN HAT3300-4T

A 4 TB 3.5" SATA hard drive built for 24/7 NAS operation with 5400 RPM, 256 MB cache and CMR technology

  • Total capacity4 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Rotational speed5,400 RPM
  • Cache memory256 MB
  • Max height20.2 mm

Capacity 4TB

  • Designed for 24/7 NAS operation with 180 TB/year workload rating
  • 2 million hours MTBF for long-term reliability
  • 256 MB cache and 5400 RPM deliver consistent CMR performance
  • Firmware updates applied directly through DSM without drive removal
  • Validated by over 500,000 hours of compatibility and stress testing

Synology HAT3300 Plus Series 4 TB NAS Drive

The Synology HAT3300-4T is a 3.5-inch SATA hard drive built for home and small-office NAS enclosures. It uses conventional magnetic recording (CMR) technology to deliver consistent write performance across its 4 TB capacity. The drive is engineered for 24/7 operation and validated through over 500,000 hours of compatibility and stress testing. Firmware updates are applied directly through Synology DSM without removing the disk.

SATA 6.0 Gb/s Interface and 5400 RPM Spindle

The single specification that determines fit is the SATA 6.0 Gb/s interface paired with a 5400 RPM spindle speed. This combination matches the drive bays and backplanes found in compatible Synology NAS units. The 256 MB cache buffers multi-user I/O streams while the 147 mm length and 20.20 mm height conform to standard 3.5-inch mounting dimensions.

180 TB/Year Workload Rating

Under sustained load the drive is rated for 180 TB of data written, read or verified per year. A 1.2 million hour MTBF figure reflects the statistical reliability target for always-on environments. Stringent validation and over 300,000 hours of additional testing ensure smooth operation during continuous multi-user workloads rather than short bursts.

How it compares

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

Price $183.99
Pricier than about 66% of the 4,938 comparable items (median $107.99).
Total capacity 4 TB
Higher than about 70% of the 2,372 comparable items (median 2 TB).
Price per TB $46.00 per TB
Cheaper than about 65% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSynology
Product lineHAT3300 Plus Series
Model nameHAT3300-4T
Total capacity4 TB
Recommended useFor NAS systems
Performance
Rotational speed5,400 RPM
Storage
Cache memory256 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height20.2 mm
Maximum width101.85 mm
Maximum length147 mm
Shipping weight0.41 kg
Package size178 × 152 × 25 mm

Other versions of this model

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Questions about this item

How does the 5400 RPM speed affect real-world performance in a NAS?

The 5400 RPM spindle and 256MB cache deliver steady throughput for multi-user file access and backup workloads, while keeping noise and power draw low for 24/7 operation.

What does the SATA 6.0Gb/s interface mean for installation and speed limits?

It connects to any standard SATA port on a NAS or motherboard; the link runs at up to 6.0Gb/s, and the drive’s own sustained rates determine actual transfer speed.

Will the 3.5-inch, 20.20mm-high chassis fit my Synology NAS bay?

Yes, the drive measures 147mm long, 101.85mm wide and 20.20mm high — the standard 3.5-inch form factor used by Synology Plus Series bays.

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