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Buffalo WS5420RN16W5 TeraStation 4-Bay Rackmount NAS - 16TB - 4 x 4TB HDD - Windows Server IoT 2025 - Intel Atom C3338 - 8GB RAM - 10GbE
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Product Features
Technical Overview
This NAS leverages an Intel Atom C3338 dual-core processor running at 1.50 GHz, paired with 8GB of DDR4 SDRAM to handle storage operations and lightweight virtualization tasks. The storage subsystem supports up to 48TB across four drive bays using Serial ATA/600 interfaces, with hardware RAID support for levels 0, 1, 5, and JBOD configurations.
Network connectivity includes three RJ-45 ports supporting both 10 Gigabit and Gigabit Ethernet, enabling high-speed data transfers and link aggregation for improved network throughput. Three USB 3.0 ports provide additional expansion options for external storage or peripherals.
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
These strengths make the product easier to deploy and manage in real environments, especially where reliability, usability, and day-to-day operational continuity matter. Notable benefits include Windows Server Integration, Virtualization Ready.
Windows Server Integration
Runs Windows Server IoT 2025 with full access to Windows management tools, Active Directory integration, and familiar security policies—all without requiring additional CAL licenses.
- No CAL requirements reduce licensing costs
- Native support for Windows file services and permissions
- Integrated with Microsoft ecosystem tools
Virtualization Ready
Supports virtualization workloads through Hyper-V compatibility, allowing organizations to consolidate servers and improve hardware utilization while maintaining isolated environments.
- Reduces physical server count
- Enables secure remote work infrastructure
- Improves hardware utilization rates
Deployment / Use Cases
The WS5420RN16W5 is ideal for small to medium businesses needing centralized storage for file sharing, backup repositories, or lightweight virtualization hosts. Its rack-mountable 1U form factor makes it suitable for data center environments where space efficiency is critical.
Common deployment scenarios include departmental file servers, backup target storage for Windows environments, iSCSI storage for virtual machines, and hybrid cloud gateways integrating with Azure and OneDrive services. The system's support for multiple protocols including CIFS/SMB, NFS, AFP, and iSCSI ensures compatibility with mixed-OS environments.
Branch Office Storage
Provides local storage with Windows Server management at remote locations, reducing WAN dependency while maintaining centralized administration through familiar tools.
Backup & Disaster Recovery
Serves as a backup target with support for Shadow Copy, Azure Backup, and replication features, creating redundant copies of critical business data.
Localization and Operating System
This TeraStation comes pre-installed with Windows Server IoT 2025, providing a full-featured server operating system optimized for embedded and storage applications. The OS includes standard Windows Server features while being tailored for dedicated storage appliance use.
The system supports connectivity from Windows 7 through Windows 11, Windows Server 2012 through 2022, and Mac OS X 10.12 Sierra, ensuring broad compatibility across heterogeneous network environments. Management protocols include SNMP for monitoring integration into existing network management systems.
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.
Physical Profile
Designed for standard 19-inch rack deployment, the WS5420RN16W5 occupies just 1U of rack space with dimensions of 1.70" (43.18 mm) height, 16.90" (429.26 mm) width, and 16.90" (429.26 mm) depth. The compact form factor maximizes storage density in constrained data center environments.
The included rail kit with mounting brackets and screws facilitates quick installation into standard server racks. The system's Japanese manufacturing and TAA compliance ensure it meets stringent quality and regulatory requirements for government and enterprise deployments.
- Width
- 16.90" (429.26 mm)
- Depth
- 16.90" (429.26 mm)
- Height
- 1.70" (43.18 mm)
What's in the Box
The package includes all necessary components for immediate deployment:
Highlights
- 4-bay rackmount NAS with 16TB (4x4TB) installed hard drives
- Windows Server IoT 2025 OS with no CAL requirements
- Intel Atom C3338 dual-core processor with 8GB DDR4 RAM
- 10 Gigabit Ethernet ports for high-speed network connectivity
- Hardware RAID support for 0, 1, 5, and JBOD configurations
- TAA compliant and manufactured in Japan
- 3-year limited warranty for long-term reliability
- Hybrid cloud integration with Azure and OneDrive
- Virtualization support for server consolidation
- Multiple protocol support including iSCSI, CIFS/SMB, NFS, and AFP
Specifications
| Specifications | |
|---|---|
| Manufacturer | Buffalo Americas, Inc |
| Manufacturer Part Number | WS5420RN16W5 |
| Brand Name | Buffalo |
| Product Line | TeraStation |
| Product Series | WS5020 |
| Product Model | WS5420RN16W5 |
| Product Name | TeraStation WS5420RN16W5 SAN/NAS Storage System |
| Product Type | SAN/NAS Storage System |
| Storage | |
| Number of Hard Drives Supported | 4 |
| Number of Hard Drives Installed | 4 |
| Total Hard Drive Capacity Supported | 48 TB |
| Total Hard Drive Capacity Installed | 16 TB |
| Hard Drive Interface | Serial ATA/600 |
| Hard Drive Configuration | 4 x 4TB |
| 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 | 4 |
| Controllers | |
| Controller Type | Serial ATA/600 |
| RAID Supported | Yes |
| RAID Levels | 0, 1, 5, JBOD |
| Interfaces/Ports | |
| Drive Interface | Serial ATA/600 |
| Total Number of USB Ports | 3 |
| Number of USB 3.0 Ports | 3 |
| 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 |
| Management & Protocols | |
| Protocols | iSCSI,TCP/IP,CIFS/SMB,AFP,FTP,SFTP,NFS,SNMP |
| Physical Characteristics | |
| Height | 1.70" (43.18 mm) |
| Width | 16.90" (429.26 mm) |
| Depth | 16.90" (429.26 mm) |
| Form Factor | Rack-mountable |
| Miscellaneous | |
| Package Contents | TeraStation WS5420RN16W5 SAN/NAS Storage System AC Cable 6a Ethernet Cable Warranty Statement Quick Setup Guide Setup Media (SD Card) Rail Kit with Mounting Brackets and Screws |
| Country of Origin | Japan |
| TAA Compliant | Yes |
| Warranty | |
| Limited Warranty | 3 Year |
FAQ
What storage capacity comes installed in this NAS?
This Buffalo TeraStation ships with 16TB of storage pre-installed across four 4TB hard drives. The system supports up to 48TB total capacity when using larger drives, providing room for future expansion as storage needs grow.
Does this NAS require additional Windows Server licenses?
No, the Windows Server IoT 2025 operating system is included and does not require separate Client Access Licenses (CALs). This makes it a cost-effective solution compared to traditional Windows Server deployments where CALs would be necessary for each user or device accessing the server.
What RAID configurations does this storage system support?
The WS5420RN16W5 supports hardware RAID levels 0 (striping), 1 (mirroring), 5 (striping with parity), and JBOD (individual disks). This flexibility allows you to choose the optimal balance of performance, redundancy, and capacity based on your specific storage requirements and data protection needs.
What network connectivity options are available?
This NAS features three RJ-45 Ethernet ports that support both 10 Gigabit and Gigabit Ethernet speeds. The 10GbE capability enables high-speed data transfers for demanding applications, while multiple ports allow for link aggregation or separate network segmentation for management and data traffic.
Can this system be used for virtualization?
Yes, the TeraStation WS5420RN16W5 supports virtualization through its Windows Server IoT 2025 foundation and compatibility with Hyper-V. The Intel Atom C3338 processor and 8GB of RAM provide sufficient resources for running lightweight virtual machines, helping consolidate server hardware and improve utilization rates.
What is included in the package for installation?
The complete package includes the TeraStation storage system itself, an AC power cable, a Category 6a Ethernet cable, warranty documentation, a quick setup guide, setup media on an SD card, and a full rail kit with mounting brackets and screws for standard 19-inch rack installation.
| Qty | Price | Available |
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