BUFFALO WS5420RN32W5 – TeraStation WS5020 32TB 4-Bay 1U Windows Server NAS
Overview
The BUFFALO WS5420RN32W5 is a 4-bay, 1U rackmount NAS in the TeraStation WS5020 series, configured with four 8TB NAS-dedicated hard drives for 32TB of total installed capacity. It runs Windows Server IoT 2025 for Storage Workgroup Edition and is designed for Windows-based file serving, centralized storage, backup, replication, and business network environments.
Technical Information
The WS5420RN32W5 uses an Intel Atom C3338 processor operating at 1.50GHz with Turbo Boost up to 2.20GHz and provides 8GB of DDR4 ECC memory. The four 3.5-inch SATA III drive bays are populated with NAS-dedicated HDDs and use software RAID. Buffalo specifies RAID 5 as the factory configuration, with RAID 1 and RAID 0 also supported.
Network connectivity includes one 10GBASE-T RJ-45 port and two 1000BASE-T RJ-45 ports. The 10GbE port supports 10Gbps, 5Gbps, 2.5Gbps, and 1Gbps operation, while the two Gigabit ports support 1000Mbps, 100Mbps, and 10Mbps connectivity.
Windows Server IoT 2025 for Storage Workgroup Edition provides Windows-based file-server capabilities, Active Directory integration, data deduplication, SMB security features, and compatibility with existing Windows management and backup environments. The system also supports iSCSI, replication, Windows Server Backup, cloud storage integration, and remote management through Buffalo KikiNavi.
Compatibility
The WS5420RN32W5 is intended for Windows-based business storage environments and supports network file services using SMB along with TCP/IP and UDP networking. Its 10GBASE-T interface can connect directly to compatible copper 10GbE switches, while the two 1000BASE-T interfaces provide Gigabit Ethernet connectivity.
The four internal bays use 3.5-inch SATA III drives. The exact configuration includes four 8TB NAS-dedicated HDDs and is factory configured for RAID 5. Buffalo specifies 24TB of RAID 5 capacity, 16TB in RAID 1, and 32TB in RAID 0 before accounting for operating-system overhead.
Key Features
- 32TB total installed capacity using four 8TB NAS-dedicated HDDs
- 4-bay 1U rackmount chassis with software RAID and hot-swappable drives
- Windows Server IoT 2025 for Storage Workgroup Edition
- 1 × 10GBASE-T and 2 × 1000BASE-T RJ-45 network interfaces
- 8GB DDR4 ECC memory with RAID 5 factory configuration
Applications
- Windows-based business file-server deployments
- Centralized network storage and backup
- Rackmount storage for server rooms and data centers
- 10GbE storage networks using copper Ethernet infrastructure
- iSCSI, replication, cloud backup, and Windows Server Backup environments
DC Supplies Product Note
The WS5420RN32W5 is factory configured with four 8TB drives in RAID 5, providing 24TB of listed RAID 5 capacity from 32TB of installed raw storage. Buffalo also supports RAID 1 and RAID 0, while the Windows Server IoT platform provides storage-management features such as replication, Active Directory integration, and Windows Server Backup.
Specifications
| Specification | Details |
|---|
| Brand | BUFFALO |
| Part Number / MPN | WS5420RN32W5 |
| Product Type | Rackmount Windows Server NAS |
| Series | TeraStation WS5020 / WS5420RN |
| Form Factor | 1U Rackmount |
| Operating System | Windows Server IoT 2025 for Storage Workgroup Edition |
| Total Installed Capacity | 32TB |
| Included Drives | 4 × 8TB NAS-dedicated HDD |
| Drive Bays | 4 × 3.5-inch |
| Drive Interface | SATA III, up to 6Gbps |
| RAID Type | Software RAID |
| Default RAID | RAID 5 |
| Supported RAID | RAID 5, RAID 1, RAID 0 |
| RAID 5 Capacity | 24TB |
| RAID 1 Capacity | 16TB |
| RAID 0 Capacity | 32TB |
| Hot Swap | Supported |
| Hot Spares | Supported |
| CPU | Intel Atom C3338, 1.50GHz, Turbo Boost 2.20GHz, 2-Core/2-Thread |
| Memory | 8GB DDR4 ECC |
| 10GbE | 1 × 10GBASE-T RJ-45 |
| Gigabit Ethernet | 2 × 1000BASE-T RJ-45 |
| USB | 3 × USB 3.2 Gen 1 Type-A |
| Network Protocols | TCP/IP, UDP, SMB |
| iSCSI | Supported |
| Replication | Supported |
| Windows Server Backup | Supported |
| Active Directory | Supported |
| Cloud Storage Integration | Supported |
| Remote Management | Buffalo KikiNavi |
| Power Supply | Internal AC 100V, 50/60Hz |
| Maximum Power Consumption | 100W |
| Operating Temperature | 0–40°C |
| Operating Humidity | 10–85% non-condensing |
| Dimensions | 430 × 44.3 × 430mm (W × H × D) |
| Weight | Approximately 8.9kg |
| Rack Mounting | 19-inch TIA/EIA-310-D compliant |
| Warranty | 3 years, including hard drives |
| Country of Origin | Japan |
| TAA Compliant | Yes |
FAQs
What is the storage capacity of the BUFFALO WS5420RN32W5?
The WS5420RN32W5 has 32TB of installed storage using four 8TB NAS-dedicated hard drives.
What RAID mode is configured by default?
Buffalo specifies RAID 5 as the factory configuration. The listed RAID 5 capacity is 24TB before operating-system storage overhead.
Does the WS5420RN32W5 support 10GbE?
Yes. It provides one 10GBASE-T RJ-45 port and two 1000BASE-T RJ-45 ports. The 10GbE port also supports 5GbE and 2.5GbE operation.
What operating system does the WS5420RN32W5 use?
The system runs Windows Server IoT 2025 for Storage Workgroup Edition, providing a Windows Server-based storage platform for business file-server deployments.
Does the WS5420RN32W5 support hot-swappable drives?
Yes. Buffalo specifies hot swapping for the four internal NAS-dedicated HDDs and supports hot-spare operation.
