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Buffalo TeraStation 2-bay desktop NAS, matte black box with front drive bays

Buffalo Technology

Buffalo Technology WS5220DN04W5 2-Bay Desktop NAS 4TB 8GB DDR4

SKU CH-KC7M-C6XRX MPN WS5220DN04W5

Two-bay desktop NAS pre-loaded with 4 TB in RAID-ready drives, running Windows Server IoT 2025 on an Intel Atom C3338 with 8 GB DDR4 and 10 GbE

  • CPUIntel Atom C3338 Dual-core (2 Core) 1.5 GHz
  • Operating systemWindows Server IoT 2025
  • Installed RAM8 GB RAM DDR4 SDRAM
  • Drives included4 TB (2 × 2 TB)
  • Maximum capacity48 TB
  • Product typeDesktop NAS
  • Ready-to-use storage with 4TB (2x2TB) HDDs included
  • Expandable capacity up to 48TB for growing data needs
  • Windows Server IoT 2025 pre-installed for familiar management
  • Intel Atom C3338 dual-core 1.50 GHz processor handles workloads
  • 8GB DDR4 memory supports smooth multi-tasking performance

TeraStation WS5220DN 2-Bay NAS

The Buffalo TeraStation WS5220DN is a 2-bay desktop network storage device preloaded with Windows Server IoT 2025. It ships with 4 TB of installed capacity across two 2 TB drives and is powered by an Intel Atom C3338 dual-core processor running at 1.50 GHz with 8 GB of DDR4 memory.

Small offices needing Windows-native file services

Teams that rely on Active Directory integration, iSCSI targets or Windows-administered shares will find the pre-installed OS familiar and ready to configure. Buyers who need more than two drive bays for larger arrays or who require a fanless silent chassis should evaluate other form factors.

48 TB maximum raw capacity

The platform supports up to 48 TB of total storage, allowing the two bays to be populated with higher-capacity drives as data needs grow. RAID 0, 1 and JBOD modes are available for performance or redundancy.

How it compares

Measured against everything we stock in Multi-Bay Desktop NAS, at today’s prices. Recalculated every night.

Price $875.99
Pricier than about 63% of the 230 comparable items (median $562.49).

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Specifications

Product
Brand nameBUFFALO
Product lineTeraStation
Model nameTeraStation WS5220DN
Part numberWS5220DN04W5
Product typeDesktop NAS
Processor
CPUIntel Atom C3338 Dual-core (2 Core) 1.5 GHz
Memory
Installed RAM8 GB RAM DDR4 SDRAM
Storage
Drives included4 TB (2 × 2 TB)
Size & build
Shipping weight5.40 kg
Package size366 × 333 × 318 mm
Software
Operating systemWindows Server IoT 2025
More details
Maximum capacity48 TB

Questions about this item

At what capacity does the 48 TB maximum limit stop me from adding more drives?

The unit supports up to 48 TB of total storage across its two drive bays, so you cannot exceed that combined capacity.

How much power does the Intel Atom C3338 draw when the NAS runs continuously?

The dual-core Intel Atom C3338 operates at 1.50 GHz and is designed for low power consumption in always-on NAS workloads.

What network connection must I already have to use the 10 Gigabit Ethernet port?

You need a 10 GbE switch or router with an RJ-45 port and compatible cabling to take advantage of the 10 Gigabit Ethernet interface.

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