BUFFALO WS5420RN16W5 – TeraStation WS5020 16TB 4-Bay 1U Windows Server NAS
Overview
The BUFFALO WS5420RN16W5 is a 4-bay, 1U rackmount NAS in the TeraStation WS5020 IoT 2025 series. It includes four 4TB hard drives for 16TB of installed storage and runs Windows Server IoT 2025 for Storage Workgroup Edition. The platform is designed for Windows-based file serving, centralized backup, storage management, and business network deployments.
Technical Information
The WS5420RN16W5 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/individual-disk configurations, with RAID 5 specified as the default configuration. Buffalo also specifies hot spares and hot swapping for the internal drives.
Network connectivity includes one 10GBASE-T RJ-45 port and two 1000BASE-T RJ-45 ports. The system supports TCP/IP, CIFS/SMB, AFP, FTP, SFTP, NFS, and SNMP, along with iSCSI, port trunking, replication, Active Directory, cloud service integration, UPS connectivity, and remote monitoring.
Windows Server IoT 2025 for Storage Workgroup Edition provides Windows Server-based file-server functionality, data deduplication, Active Directory integration, SMB over QUIC, and enhanced security features. Buffalo specifies support for up to 50 concurrent sessions without requiring Client Access Licenses.
Compatibility
The WS5420RN16W5 is intended for Windows-based business storage environments and supports Windows client and Windows Server operating systems as well as macOS 10.12 or later. Its Windows Server foundation also allows integration with Microsoft services and compatible cloud platforms such as Azure and OneDrive.
The installed storage consists of four 4TB SATA HDDs. Buffalo identifies the OP-HD4.0N as a compatible replacement drive for the 4TB drive configuration. The system supports RAID 0, RAID 1, RAID 5, and JBOD/individual-disk operation, with RAID 5 configured by default.
Key Features
- 16TB installed capacity using four 4TB hard drives
- 1U rackmount chassis with four hot-swappable drive bays
- 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 0, 1, 5, and JBOD support
Applications
- Windows-based business file server deployments
- Centralized network storage and backup
- Rackmount storage for small business server rooms
- iSCSI storage and backup infrastructure
- Hybrid storage environments using Microsoft-compatible cloud services
DC Supplies Product Note
The WS5420RN16W5 combines a 1U rackmount chassis with Windows Server IoT 2025 rather than a conventional NAS-only operating environment. Its four 4TB drives are factory configured for RAID 5, providing a Windows-based storage platform with 10GbE connectivity and hot-swappable drive support in a compact rack footprint.
Specifications
| Specification | Details |
|---|
| Brand | BUFFALO |
| Part Number / MPN | WS5420RN16W5 |
| Product Type | Rackmount Windows Server NAS |
| Series | TeraStation WS5020 IoT 2025 |
| Form Factor | 1U Rackmount |
| Operating System | Windows Server IoT 2025 for Storage Workgroup Edition |
| Total Installed Capacity | 16TB |
| Included Drives | 4 × 4TB HDD |
| Drive Bays | 4 |
| Drive Interface | SATA 6Gbps |
| Supported RAID | RAID 0, RAID 1, RAID 5, JBOD / Individual Disks |
| Default RAID | RAID 5 |
| Hot Swap | Supported |
| Hot Spares | Supported |
| CPU | Intel Atom C3338 |
| 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, CIFS/SMB, AFP, FTP, SFTP, NFS, SNMP |
| iSCSI | Supported |
| Port Trunking | Supported |
| Replication | Supported |
| Active Directory | Supported |
| Cloud Service Integration | Supported |
| UPS Support | USB / Network |
| Concurrent Sessions | Up to 50 without Client Access Licenses |
| Power Input | Internal AC 100–240V, 50/60Hz |
| Maximum Power Consumption | 100W |
| Data Transfer Power Consumption | 61.7W |
| Idle Power Consumption | 58.7W |
| Standby Power Consumption | 4.9W |
| Operating Temperature | 0–40°C |
| Operating Humidity | 10–85% non-condensing |
| Dimensions | 16.9 × 16.9 × 1.7 in |
| Weight | 19.6 lb |
| Compatible Replacement Drive | OP-HD4.0N |
| Warranty | 3 years |
| Country of Origin | Japan |
| TAA Compliant | Yes |
FAQs
What operating system does the BUFFALO WS5420RN16W5 use?
The WS5420RN16W5 runs Windows Server IoT 2025 for Storage Workgroup Edition.
What is the storage capacity of the WS5420RN16W5?
The system has 16TB of installed storage using four 4TB hard drives.
What RAID modes are supported?
The WS5420RN16W5 supports RAID 0, RAID 1, RAID 5, and JBOD/individual-disk operation. RAID 5 is the default configuration.
Does the WS5420RN16W5 support 10GbE?
Yes. The system provides one 10GBASE-T RJ-45 port and two 1000BASE-T RJ-45 ports.
Does the WS5420RN16W5 support hot-swappable drives?
Yes. Buffalo specifies hot swapping and hot spares for the four internal drive bays.
