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Buffalo WS5220DN04W5 TeraStation Desktop NAS - Windows Server IoT 2025 - 2-Bay - 4TB Installed - 2 x 2TB - Intel Atom C3338 - 8GB DDR4 - 10GbE
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Product Features
Technical Overview
This TeraStation model is built around a storage‑optimized platform that balances performance, capacity, and manageability. The Intel Atom C3338 dual‑core processor operates at 1.50 GHz, providing sufficient compute power for file services, iSCSI targets, and lightweight virtualization. System memory is 8GB of DDR4 SDRAM, which supports caching and multiple concurrent connections without bottlenecking.
Storage is handled via two Serial ATA/600 (SATA 6Gb/s) drive bays, both populated with 2TB hard drives for a total of 4TB installed capacity. The controller supports RAID 0, RAID 1, and JBOD configurations, allowing administrators to choose between performance, redundancy, or independent drive usage. Network connectivity includes three RJ‑45 ports that support both 10 Gigabit Ethernet and Gigabit Ethernet, enabling high‑speed data transfers and link aggregation for improved throughput and redundancy.
Relevant factors for this section include Number of Hard Drives Supported, Number of Hard Drives Installed, Total Hard Drive Capacity Supported, Processor Manufacturer. When those points are considered together, they give buyers a clearer picture of how the product is equipped, how it fits into deployment, and what kind of day-to-day role it is meant to support.
Key Product Advantages
The TeraStation WS5220DN04W5 eliminates licensing complexity by including Windows Server IoT 2025 with no CAL requirements, reducing both upfront and ongoing costs. Its native Windows environment supports familiar management tools, Active Directory integration, and a broad range of Windows‑based applications and services. The system also enables hybrid‑cloud workflows through built‑in integration with Microsoft Azure, OneDrive, and other compatible cloud platforms.
Virtualization Ready
Run virtual machines directly on the NAS to consolidate workloads, improve hardware utilization, and support secure remote access scenarios without additional server hardware.
- Reduces physical server count
- Enables streamlined remote work
- Leverages Windows Hyper‑V
Comprehensive Data Protection
Utilize Windows Server features like Shadow Copy, Azure Backup, and replication to safeguard critical data. The NAS also supports iSCSI for block‑level storage provisioning.
- Snapshot‑based recovery
- Cloud‑backup integration
- iSCSI target support
Deployment / Use Cases
This desktop NAS is ideal for organizations that need a compact, all‑in‑one storage solution with full Windows Server capabilities. It serves effectively as a departmental file server, providing centralized storage for documents, projects, and user home directories while integrating seamlessly with existing Windows networks. IT teams can also deploy it as a backup target for workstations and servers, leveraging its RAID protection and high‑speed network ports to ensure data integrity and fast restore times.
For businesses exploring virtualization or remote work infrastructure, the TeraStation can host virtual machines for applications, testing environments, or remote‑desktop services. Its hybrid‑cloud features allow data to be tiered between on‑premises storage and cloud services like Azure, creating a flexible, scalable storage architecture. The unit’s desktop form factor and quiet operation make it suitable for office environments, branch locations, or small data‑center racks where space is limited.
Localization and Operating System
The TeraStation WS5220DN04W5 ships with Windows Server IoT 2025 pre‑installed, providing a full‑featured server operating system optimized for embedded and storage applications. This edition includes core Windows Server roles such as File Services, Storage Services, and Hyper‑V, along with support for Active Directory, Group Policy, and Windows Defender. Because it is a Windows Server IoT edition, no additional Client Access Licenses are required for connected users or devices, significantly simplifying licensing management and reducing total cost of ownership.
The system is compatible with a wide range of client operating systems, including Windows 11, Windows 10, Windows 8.1, Windows 7, Windows Server 2022/2019/2016/2012 R2, and macOS Sierra 10.12. Network protocols supported include CIFS/SMB for Windows file sharing, AFP for macOS, NFS for Unix/Linux environments, FTP/SFTP for file transfers, and iSCSI for block‑storage access. This broad compatibility ensures seamless integration into mixed‑OS environments.
Physical Profile
Housed in a compact desktop chassis, the TeraStation measures 6.70 inches wide by 6.70 inches high by 9.10 inches deep (170.18 mm x 170.18 mm x 231.14 mm), making it easy to place on a desk, shelf, or in a small rack with an optional shelf. The all‑metal construction provides durability and effective heat dissipation, while the front panel includes status indicators and a physical security key to prevent unauthorized drive removal. The desktop form factor is designed for quiet operation in office settings, with no need for dedicated server‑room cooling.
- Width
- 6.70" (170.18 mm)
- Depth
- 9.10" (231.14 mm)
- Height
- 6.70" (170.18 mm)
What's in the Box
The package includes everything needed for a quick setup and immediate operation.
Highlights
- Windows Server IoT 2025 pre‑installed with no CAL requirements
- 4TB of installed storage across two 2TB hard drives
- Intel Atom C3338 dual‑core processor and 8GB DDR4 RAM
- Three network ports supporting 10GbE and Gigabit Ethernet
- RAID 0, 1, and JBOD support for data protection or performance
- Hybrid‑cloud integration with Azure and OneDrive
- Virtual machine hosting capability with Hyper‑V
- TAA compliant and backed by a 3‑year limited warranty
- Compact desktop form factor for office environments
- Broad client OS support including Windows, macOS, and Linux
Specifications
| Specifications | |
|---|---|
| Manufacturer | Buffalo Americas, Inc |
| Manufacturer Part Number | WS5220DN04W5 |
| Brand Name | Buffalo |
| Product Line | TeraStation |
| Product Series | WS5020 |
| Product Model | WS5220DN04W5 |
| Product Name | TeraStation WS5220DN04W5 SAN/NAS Storage System |
| Product Type | SAN/NAS Storage System |
| Storage | |
| Number of Hard Drives Supported | 2 |
| Number of Hard Drives Installed | 2 |
| Total Hard Drive Capacity Supported | 48 TB |
| Total Hard Drive Capacity Installed | 4 TB |
| Hard Drive Interface | Serial ATA/600 |
| Hard Drive Configuration | 2 x 2TB |
| Processor & Chipset | |
| Processor Manufacturer | Intel |
| Processor Type | Atom |
| Processor Model | C3338 |
| Processor Core | Dual-core (2 Core) |
| Processor Speed | 1.50 GHz |
| Memory | |
| Standard Memory | 8 GB |
| Memory Technology | DDR4 SDRAM |
| Network & Communication | |
| Ethernet Technology | 10 Gigabit Ethernet,Gigabit Ethernet |
| I/O Expansions | |
| Number of Total Expansion Bays | 2 |
| Controllers | |
| Controller Type | Serial ATA/600 |
| RAID Supported | Yes |
| RAID Levels | 0, 1, JBOD |
| Interfaces/Ports | |
| Drive Interface | Serial ATA/600 |
| Total Number of USB Ports | 2 |
| Number of USB 3.2 Gen 1 Ports | 2 |
| Network (RJ-45) | Yes |
| Number of Network (RJ-45) Ports | 3 |
| Software | |
| Operating System | Windows Server IoT 2025 |
| Operating System Supported | Windows 11,Windows 10,Windows 10 x64,Windows 8.1,Windows 8.1 x64,Windows 7,Windows 7 x64,Windows Server 2022,Windows Server 2016,Windows Server 2019,Windows Server 2012,Windows Server 2012 R2,Mac OS X 10.12 Sierra,Windows 11 x64 |
| Management & Protocols | |
| Protocols | iSCSI,TCP/IP,CIFS/SMB,AFP,FTP,SFTP,NFS,SNMP |
| Physical Characteristics | |
| Height | 6.70" (170.18 mm) |
| Width | 6.70" (170.18 mm) |
| Depth | 9.10" (231.14 mm) |
| Form Factor | Desktop |
| Miscellaneous | |
| Package Contents | TeraStation WS5220DN04W5 SAN/NAS Storage System AC Cable 6a Ethernet Cable Front Panel Key Warranty Statement Quick Setup Guide Setup Media (SD Card) |
| Country of Origin | Japan |
| TAA Compliant | Yes |
| Warranty | |
| Limited Warranty | 3 Year |
FAQ
What operating system does this Buffalo TeraStation NAS use?
The TeraStation WS5220DN04W5 comes with Windows Server IoT 2025 pre‑installed. This is a full edition of Windows Server optimized for storage and embedded use, providing features like file sharing, Hyper‑V virtualization, Active Directory integration, and built‑in data‑protection tools. Importantly, this IoT edition does not require separate Client Access Licenses (CALs), which simplifies licensing and reduces costs compared to standard Windows Server editions.
How much storage is included, and can I expand it later?
This unit includes 4TB of installed storage, delivered as two 2TB hard drives. The NAS has two drive bays total, both of which are populated in this configuration. You can expand storage by replacing the existing drives with higher‑capacity models; the system supports up to 48TB total (24TB per bay when using the largest compatible drives). The drive interface is Serial ATA/600 (SATA 6Gb/s), and the controller supports RAID 0, RAID 1, and JBOD for flexibility in configuration.
What are the network connectivity options on this NAS?
The TeraStation WS5220DN04W5 features three RJ‑45 Ethernet ports that support both 10 Gigabit Ethernet and Gigabit Ethernet. This allows for high‑speed data transfers, link aggregation for increased throughput or redundancy, and separate network segmentation if needed. The unit also includes two USB 3.2 Gen 1 ports for connecting external storage, printers, or other peripherals. Supported network protocols include iSCSI, CIFS/SMB, AFP, NFS, FTP, and SFTP, ensuring compatibility with a wide range of clients and applications.
Can this NAS be used for virtualization or remote work?
Yes. With Windows Server IoT 2025 and Hyper‑V support, this TeraStation can host virtual machines directly on the storage system. This capability allows businesses to consolidate workloads, run test environments, or deploy remote‑desktop services without additional server hardware. The system also integrates with cloud services like Microsoft Azure and OneDrive, enabling hybrid‑cloud scenarios that support secure remote access and data tiering. These features make it suitable for organizations looking to streamline remote work infrastructure.
What data‑protection features does this Buffalo NAS offer?
The NAS leverages Windows Server data‑management tools for comprehensive protection. This includes Shadow Copy for point‑in‑time snapshots, Azure Backup for cloud‑based backups, and replication for duplicating data to another location. The hardware supports RAID 0 (striping for performance), RAID 1 (mirroring for redundancy), and JBOD (independent drives). Additionally, the iSCSI protocol allows the unit to serve as a block‑storage target for backup software or virtualized environments, providing multiple layers of data safety.
Is this TeraStation compliant with government procurement regulations?
Yes, the TeraStation WS5220DN04W5 is TAA (Trade Agreements Act) compliant, meaning it meets sourcing requirements for U.S. federal government purchases and other regulated procurements. The unit is manufactured in Japan and includes a three‑year limited warranty for added assurance. Its desktop form factor, quiet operation, and broad compatibility make it suitable for use in government offices, educational institutions, and commercial environments where regulatory compliance is necessary.
| Qty | Price | Available |
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