Buffalo TeraStation 5420RN 40TB 4-Bay Windows IoT NAS Server (4 x 10TB)

Overview

The Buffalo WS5420RN40S9 is a four-bay rackmount NAS server designed to provide reliable and high-capacity storage for small to medium-sized businesses. Equipped with 40TB of raw storage across four NAS-grade hard drives configured in RAID 5, it offers 30TB of usable space with protection against a single drive failure. Running Windows Server IoT 2019, this NAS integrates seamlessly into Windows environments, supporting Active Directory and Group Policy without requiring Client Access Licenses, making it a familiar and cost-effective solution for offices that depend on Windows networks.

Key features

• Pre-configured RAID 5 array delivers a balance of data protection and storage efficiency with 30TB of usable capacity.
• Windows Server IoT 2019 operating system enables easy integration with existing Windows domains and remote management capabilities.
• Native 10 GbE network port and 8 GB of ECC memory ensure fast and stable performance during large file transfers and heavy workloads.
• Built-in cloud replication supports Microsoft Azure and OneDrive, providing flexible off-site backup options for critical data.
• Versatile use cases including file sharing, on-site backup, disaster recovery, and network video recording without subscription fees.
• Made in Japan with TAA compliance, meeting government and regulated environment standards.
• Three-year warranty backed by 24/7 North America-based technical support for peace of mind and minimal downtime.

Key specs

• Storage capacity: 40 TB raw (4 x 10TB NAS-grade drives)
• Usable capacity: 30 TB in RAID 5 configuration
• Operating system: Windows Server IoT 2019
• Memory: 8 GB ECC RAM
• Network interface: 10 GbE port
• Drive bays: 4 hot-swappable bays
• Warranty: 3 years

Connectivity and compatibility

This NAS server is designed to fit smoothly into Windows-based networks, supporting Active Directory and Group Policy for centralized user and device management. The 10 GbE port allows for high-speed network connections, ideal for environments with large file transfers or virtualization needs. Its compatibility with Microsoft Azure and OneDrive enables straightforward cloud backup integration, enhancing data protection strategies without additional licensing costs.

Performance and reliability

With error-correcting code (ECC) memory and NAS-grade hard drives pre-tested by Buffalo, this unit maintains data integrity and consistent performance even under demanding workloads. The RAID 5 setup protects against single drive failures, reducing the risk of data loss. Its robust hardware and software combination supports multi-camera video archives and virtualization storage, making it a dependable choice for businesses that require continuous access to critical data.

Ideal uses and environments

The TeraStation WS5420RN40S9 is well suited for offices that need a centralized file server with strong data protection and easy integration into existing Windows domains. It works effectively as a primary file server during business hours and as a backup target after hours. Additionally, it supports network video recording for security systems, providing local storage for weeks of footage without recurring fees. Its TAA compliance and build quality also make it a good fit for government and regulated environments.