Buffalo TeraStation WS5020 IoT 4TB 2-Bay NAS Server (2 x 2TB)

BH #BUWS5220DN04 • MFR #WS5220DN04W5
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Buffalo TeraStation WS5020 IoT 4TB 2-Bay NAS Server (2 x 2TB)
Key Features
  • 4TB Storage Capacity
  • 2 x 2TB 3.5" SATA III HDDs
  • 1.5 GHz Intel Atom C3338 2-Core CPU
  • 8GB DDR4 ECC RAM
Purpose built as efficient data storage and backup solutions for small businesses, the TeraStation WS5020 IoT 4TB 2-Bay NAS Server from Buffalo runs on the Windows Server IoT 2025 for Storage Workgroup operating system and integrates seamlessly into Windows-based environments and Microsoft services such as Azure and OneDrive. It can act as a multi-purpose file server, a central backup hub for all your files, an NVR server for security cameras, or a subscription-free backup and disaster recovery (BDR) appliance.
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Buffalo 5220DN Overview

Purpose built as efficient data storage and backup solutions for small businesses, the TeraStation WS5020 IoT 4TB 2-Bay NAS Server from Buffalo runs on the Windows Server IoT 2025 for Storage Workgroup operating system and integrates seamlessly into Windows-based environments and Microsoft services such as Azure and OneDrive. It can act as a multi-purpose file server, a central backup hub for all your files, an NVR server for security cameras, or a subscription-free backup and disaster recovery (BDR) appliance.

Built with a desktop form factor, the TeraStation WS5020 is driven by a 1.5 GHz Intel Atom C3338 2-Core processor and 8GB of DDR4 ECC RAM. It features two hot-swappable drive bays, each of which is populated with a 2TB 3.5" SATA III hard drive, giving users access to an overall storage capacity of 4TB. Connect to networks via one 10GbE and two Gigabit Ethernet ports, while RAID 0 and 1 provide improved performance or data redundancy. For those who do not need a RAID, JBOD is also available. Additional connectivity options include two USB-A 3.2 Gen 1 ports and one VGA port.

Please note that the TeraStation WS5020 comes preconfigured as RAID 1, which uses one 2TB drive for data storage and the other for 1:1 redundancy. As such, users will have access to 2TB of storage when configured as RAID 1.

Windows Server Operating System
Native Windows Server IoT 2025 for Storage Workgroup edition that is optimized for SMB storage.
Day One Ready
Pre-tested NAS-grade hard drives included with RAID pre-configured for day one data protection.
No CALs Required
With Windows Server IoT there are no Client-Access Licenses required (supports a maximum of 50 concurrent sessions).
Cloud Integration
Sync with Microsoft-compatible cloud services such as Azure and OneDrive for hybrid cloud setups.
Windows Data Management and Security
Cost-effective small business NAS with Windows Server enhanced data management and security features.
Professional Backup Software
Includes NovaBACKUP software license(s) for versatile, professional-level server and PC backups.
Low Cost Deployment
Whether you are replacing an aging NAS or installing a new on-site storage or backup server, you can easily implement the Windows Server IoT 2025 NAS without extra cost or hassle. In addition, the WS IoT 2025 TeraStation does not require any Client Access Licenses (CALs). You can have up to 50 users access the NAS without needing to pay additional costs to further help device integration.
Windows Server Optimized for Storage
Windows Server IoT 2025 for Storage Workgroup Edition is a specialized version of Windows Server IoT with dedicated file server capabilities and streamlined for small storage solutions. You can integrate any Windows product, service, or platform you are already using as needed, as Windows Server IoT 2025 offers enhanced app compatibility from previous editions.

The NAS integrates seamlessly into Windows environments, with the familiar Windows Server interface minimizing training needs. It also offers the latest Windows Server features including data deduplication and Active Directory with enhanced security and greater scalability.

Enhanced Data Security
Windows Server IoT 2025 enhances security with SMB over QUIC for encrypted remote access, Active Directory with stronger encryption, automated password management through Delegate Managed Service Accounts, mandatory LDAP encryption, and virtualization-based security to protect sensitive keys and workloads.
UPC: 747464136448

Buffalo 5220DN Specs

Key Specs
Storage Capacity
4 TB
Included Drives
2x 2 TB SATA III 3.5" HDD
RAID
Yes: Supported RAID Modes: 0 / 1 / JBOD (Preconfigured in RAID 1)
Number of Bays
2x 3.5" SATA III (Hot-Swap)
Inputs/Outputs
1x RJ45 10GbE
2x RJ45 Gigabit Ethernet
2x USB-A 3.0 / 3.1/3.2 Gen 1
1x VGA
Computing
CPU
Dual-Core: 1.5 to 2.2 GHz
Processor
Intel Atom C3338
GPU
No
Memory
8 GB ECC DDR4
Drives
Storage Capacity
4 TB
Included Drives
2x 2 TB SATA III 3.5" HDD
RAID
Yes: Supported RAID Modes: 0 / 1 / JBOD (Preconfigured in RAID 1)
General
Number of Bays
2x 3.5" SATA III (Hot-Swap)
Inputs/Outputs
1x RJ45 10GbE
2x RJ45 Gigabit Ethernet
2x USB-A 3.0 / 3.1/3.2 Gen 1
1x VGA
Media Card Slots
No
PCI Expansion
No
Networking
Link Aggregation and Failover Support
Yes
iSCSI Support
Yes
Software
Installed Operating System
Microsoft Windows Server IoT 2025 for Storage Workgroup Edition
OS Compatibility
Windows 7 or Later
Windows Server 2012 or Later
macOS 10.12
Mobile App Compatible
No
Security
Encryption
Yes
Security Features
Lockable Bay Door
VPN Connections
No
Electrical
Input Power
100 to 240 VAC, 50 / 60 Hz at 1.5 A
Power Consumption
85 W (Maximum)
30.7 W (Typical)
25.5 W (Idle)
6.1 W (Standby)
Physical
Operating Conditions
32 to 104°F / 0 to 40°C at 10 to 85% Humidity
Certifications
TAA
Cooling
1x Fan
Dimensions
9.1 x 6.7 x 6.7" / 23.1 x 17 x 17 cm
Weight
10.4 lb / 4.7 kg

Buffalo 5220DN Reviews

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