BUFFALO WS5220DN04W5 – TeraStation WS5020 4TB 2-Bay 10GbE Windows Server NAS
Overview
The BUFFALO WS5220DN04W5 is a 2-bay TeraStation WS5020 desktop NAS with 4TB of factory-installed storage using two 2TB NAS-dedicated hard drives. It runs Windows Server IoT 2025 for Storage Workgroup Edition and provides 10GbE plus dual Gigabit Ethernet connectivity for network file storage and server-oriented deployments.
Technical Information
The WS5220DN04W5 uses an Intel Atom C3338 processor running at 1.50GHz with Turbo Boost up to 2.20GHz and two cores with two threads. It includes 8GB of DDR4 ECC memory. Storage uses two SATA 6Gbps NAS-dedicated HDDs in a software RAID configuration, with RAID 1 set as the factory default.
Network connectivity consists of one 10GBASE-T RJ-45 port and two 1000BASE-T RJ-45 ports. The 10GbE interface also supports 5GbE and 2.5GbE operation. Two USB 3.2 Gen 1 Type-A ports provide connectivity for compatible USB devices.
Compatibility
The WS5220DN04W5 is designed around Windows Server IoT 2025 for Storage Workgroup Edition and supports SMB network file sharing. The system also supports iSCSI target functionality. Its Ethernet interfaces support standard 10GbE, 5GbE, 2.5GbE, and Gigabit Ethernet network infrastructure.
Key Features
- 4TB total capacity from two factory-installed 2TB NAS HDDs
- Windows Server IoT 2025 for Storage Workgroup Edition
- 1 x 10GBASE-T plus 2 x 1000BASE-T network ports
- 8GB DDR4 ECC memory with Intel Atom C3338 processor
- Factory-configured software RAID 1 for two-drive redundancy
Applications
The WS5220DN04W5 is suited to small-business file services, centralized document storage, Windows-based server workloads, backup repositories, replication, and network storage deployments requiring a Windows Server operating environment. The combination of 10GbE and RAID 1 provides a suitable foundation for high-speed shared storage where two-drive redundancy is required.
DC Supplies Product Note
The WS5220DN04W5 is a 2-bay Windows Server NAS with a factory RAID 1 configuration. Its 4TB installed capacity is provided by two 2TB drives, while the two-bay chassis limits internal expansion to the available drive bays.
Specifications
| Specification | Details |
|---|
| Brand | BUFFALO |
| Part Number / MPN | WS5220DN04W5 |
| Product Type | Windows Server NAS / Network Attached Storage |
| Series | TeraStation WS5020 |
| Form Factor | Desktop |
| Operating System | Windows Server IoT 2025 for Storage Workgroup Edition |
| Installed Capacity | 4TB |
| Drive Bays | 2 |
| Installed Drives | 2 x 2TB NAS-dedicated HDD |
| Drive Interface | SATA 6Gbps |
| RAID Type | Software RAID |
| Supported RAID | RAID 0, RAID 1, JBOD |
| Factory RAID | RAID 1 |
| Processor | Intel Atom C3338 |
| Processor Speed | 1.50GHz; Turbo Boost up to 2.20GHz |
| Processor Cores / Threads | 2 cores / 2 threads |
| Memory | 8GB DDR4 ECC |
| LAN Ports | 1 x 10GBASE-T, 2 x 1000BASE-T |
| Supported Ethernet Speeds | 10Gbps, 5Gbps, 2.5Gbps, 1000Mbps, 100Mbps, 10Mbps |
| Network Connector | RJ-45 |
| Network File Protocol | SMB |
| iSCSI Target | Yes |
| USB | 2 x USB 3.2 Gen 1 Type-A |
| USB Transfer Rate | Up to 5Gbps |
| Maximum Power Consumption | 85W |
| Power Supply | Internal AC 100–240V, 50/60Hz |
| Operating Temperature | 0–40°C |
| Operating Humidity | 10–85% non-condensing |
| Dimensions | 9.1 x 6.7 x 6.7 in |
| Weight | 11.0 lb |
| Country of Origin | Japan |
| TAA Compliant | Yes |
FAQs
What is the storage capacity of the WS5220DN04W5?
The WS5220DN04W5 includes two 2TB NAS-dedicated hard drives for 4TB of total installed raw capacity.
What RAID configuration is supplied?
The system supports software RAID 0, RAID 1, and JBOD, with RAID 1 specified as the factory default configuration.
What operating system does the WS5220DN04W5 use?
The NAS runs Windows Server IoT 2025 for Storage Workgroup Edition.
Does the WS5220DN04W5 support 10GbE?
Yes. It provides one 10GBASE-T RJ-45 port. The interface also supports 5GbE and 2.5GbE operation in addition to standard Gigabit Ethernet connectivity.
How much memory is installed?
The WS5220DN04W5 has 8GB of DDR4 ECC memory.
Does the NAS support iSCSI?
Yes. The WS5220DN04W5 supports iSCSI target functionality in addition to SMB network file sharing.
