BUFFALO WS5420DN48W5 – TeraStation WS5020 48TB 4-Bay Windows Server NAS
Overview
The BUFFALO WS5420DN48W5 is a 48TB 4-bay desktop NAS in the TeraStation WS5020 IoT series, supplied with four 12TB SATA hard drives. It runs Windows Server IoT 2025 for Storage Workgroup Edition and provides network storage capabilities for Windows-based file-serving environments.
Technical Information
The system uses an Intel Atom C3338 processor and 8GB of DDR4 ECC memory. Its four SATA 6Gbps drive bays support RAID 0, RAID 1, RAID 5, and JBOD configurations, with RAID 5 configured as the default storage mode. Hot-spare capability and hot swapping are supported.
Network connectivity includes one 10GbE RJ45 interface and two Gigabit Ethernet RJ45 interfaces. The platform also provides two USB 3.2 Gen 1 Type-A ports for compatible external devices.
Compatibility
Windows Server IoT 2025 for Storage Workgroup Edition provides a Windows Server-based storage platform with support for integration into Windows environments. The system supports Windows Server file-storage workflows and network connectivity through 10GbE and Gigabit Ethernet interfaces.
The four internal drives use SATA 6Gbps interfaces. Replacement 12TB drives are available as BUFFALO OP-HD12.0N drives, which are listed as compatible with the WS5420DN48W5.
Key Features
- 48TB total installed storage using four 12TB SATA hard drives
- Windows Server IoT 2025 for Storage Workgroup Edition
- Intel Atom C3338 processor with 8GB DDR4 ECC memory
- 1× 10GbE and 2× Gigabit Ethernet network interfaces
- RAID 0, 1, 5, and JBOD support with hot swapping
Applications
The WS5420DN48W5 is suited to centralized file storage, Windows-based network storage, shared departmental data, backup repositories, and environments requiring high-speed 10GbE network access from a four-drive NAS platform.
DC Supplies Product Note
For replacement-drive planning, the installed 12TB drive capacity corresponds to BUFFALO's OP-HD12.0N replacement-drive specification for this exact model. Verify the required RAID configuration and available network infrastructure before deployment.
Specifications
| Specification | Details |
|---|
| Brand | BUFFALO |
| Part Number / MPN | WS5420DN48W5 |
| Product Type | 4-Bay Desktop NAS |
| Series | TeraStation WS5020 IoT |
| Installed Capacity | 48TB |
| Included Drives | 4 × 12TB |
| Drive Interface | SATA 6Gbps |
| Drive Bays | 4 |
| Supported RAID | RAID 0, RAID 1, RAID 5, JBOD |
| Default RAID | RAID 5 |
| Hot Swapping | Supported |
| Processor | Intel Atom C3338 |
| Memory | 8GB DDR4 ECC |
| Operating System | Windows Server IoT 2025 for Storage Workgroup Edition |
| 10GbE | 1 × RJ45 |
| Gigabit Ethernet | 2 × RJ45 |
| USB | 2 × USB 3.2 Gen 1 Type-A |
| Power Supply | Internal AC 100–240V, 50/60Hz |
| Maximum Power Consumption | 85W |
| Operating Temperature | 0–40°C |
| Operating Humidity | 10–85% non-condensing |
| Country of Origin | Japan |
| TAA Compliant | Yes |
| Warranty | 3 years, including hard drives |
FAQs
What is the storage capacity of the WS5420DN48W5?
The WS5420DN48W5 provides 48TB of installed storage using four 12TB hard drives.
What operating system does the WS5420DN48W5 use?
It uses Windows Server IoT 2025 for Storage Workgroup Edition.
Which RAID levels are supported?
The NAS supports RAID 0, RAID 1, RAID 5, and JBOD, with RAID 5 configured as the default.
Does the WS5420DN48W5 support 10GbE?
Yes. It provides one RJ45 10GbE network interface along with two RJ45 Gigabit Ethernet interfaces.
Can the internal drives be hot swapped?
Yes. The four internal drive bays support hot swapping, with hot-spare capability also supported.
