BUFFALO WS5220DN08W5 – TeraStation WS5020 8TB 2-Bay Windows Server NAS
Overview
The BUFFALO WS5220DN08W5 is a TeraStation WS5020 IoT desktop NAS configured with two 4TB NAS-dedicated HDDs for 8TB of installed storage. It uses Windows Server IoT 2025 for Storage Workgroup as its operating system and provides a Windows-based file server platform for small business and workgroup storage deployments.
The two-bay system includes one 10GbE RJ-45 port and two 1GbE RJ-45 ports. The installed drives are configured in RAID 1 by default, providing 4TB of RAID 1 storage capacity before operating-system overhead.
Technical Information
The WS5220DN platform uses an Intel Atom C3338 dual-core processor operating at 1.50GHz with Turbo Boost up to 2.20GHz and 8GB of DDR4 ECC memory. Internal storage uses two 3.5-inch NAS-dedicated HDDs connected through Serial ATA III.
The installed operating system is Windows Server IoT 2025 for Storage Workgroup. The platform provides Windows Server storage capabilities including Windows Server Backup, replication, Active Directory integration, subfolder access restrictions, cloud storage integration, and remote management through Buffalo's KikiNavi service.
Compatibility
The WS5220DN08W5 has two 3.5-inch drive bays and supports RAID 1 and RAID 0, as well as individual-disk operation. RAID 1 is the factory configuration. Hot swapping and hot-spare functionality are supported.
Network connectivity consists of one 10GBASE-T RJ-45 port and two 1000BASE-T RJ-45 ports. The 10GbE interface supports 10Gbps, 5Gbps, 2.5Gbps, and 1Gbps operation, while the Gigabit ports support 1000Mbps, 100Mbps, and 10Mbps operation. SMB is the documented network file protocol.
The system provides two USB 3.2 Gen 1 Type-A ports with transfer rates up to 5Gbps. A VGA output is also provided for local display access.
Key Features
- 8TB installed capacity using two 4TB NAS-dedicated HDDs.
- Two-bay desktop chassis with hot-swappable storage.
- One 10GbE RJ-45 port plus two 1GbE RJ-45 ports.
- Intel Atom C3338 dual-core processor with 8GB DDR4 ECC memory.
- Windows Server IoT 2025 for Storage Workgroup with factory RAID 1.
Applications
- Windows-based business file server deployments
- Small office and workgroup network storage
- Centralized SMB file storage
- Windows Server backup and replication
- Active Directory-integrated storage environments
DC Supplies Product Note
The WS5220DN08W5 is the 8TB configuration of the two-bay WS5220DN platform, using two 4TB drives in the factory RAID 1 configuration. Because both drive bays are populated, increasing internal capacity requires replacing the installed drives rather than adding another drive.
Specifications
| Specification | Details |
|---|
| Brand | BUFFALO |
| Part Number / MPN | WS5220DN08W5 |
| Product Type | Windows Server NAS |
| Series | TeraStation WS5020 IoT |
| Form Factor | Desktop |
| Drive Bays | 2 |
| Included Drives | 2 |
| Drive Configuration | 2 x 4TB |
| Total Installed Capacity | 8TB |
| Drive Type | NAS-dedicated HDD |
| Drive Size | 3.5-inch |
| Drive Interface | Serial ATA III / SATA 6Gb/s |
| Factory RAID | RAID 1 |
| RAID 1 Capacity | 4TB |
| Supported RAID | RAID 0/1 |
| Individual Disk Mode | Yes |
| Processor | Intel Atom C3338 |
| Processor Speed | 1.50GHz; Turbo Boost up to 2.20GHz |
| CPU Cores / Threads | 2 cores / 2 threads |
| Memory | 8GB DDR4 ECC |
| 10GbE Port | 1 x 10GBASE-T RJ-45 |
| Gigabit Ethernet Ports | 2 x 1000BASE-T RJ-45 |
| Supported Network Speeds | 10Gbps/5Gbps/2.5Gbps/1Gbps/100Mbps/10Mbps |
| Network File Protocol | SMB |
| USB Ports | 2 x USB 3.2 Gen 1 Type-A |
| USB Transfer Rate | Up to 5Gbps |
| Video Output | 1 x VGA |
| iSCSI | Yes |
| Hot Swap | Yes |
| Hot Spares | Yes |
| Operating System | Windows Server IoT 2025 for Storage Workgroup |
| Backup | Windows Server Backup |
| Replication | Yes |
| Active Directory Integration | Yes |
| Cloud Storage Integration | Yes |
| Remote Management | KikiNavi |
| Power Supply | Internal AC 100–240V, 50/60Hz |
| Maximum Power Consumption | 85W |
| Data Transfer Power Consumption | 30.7W |
| Idle Power Consumption | 25.5W |
| Standby Power Consumption | 6.1W |
| Operating Temperature | 0–40°C |
| Operating Humidity | 10–85% non-condensing |
| Cooling | 1 x 92mm ball-bearing fan |
| Dimensions (W x H x D) | 170 x 170 x 230mm |
| Weight | Approximately 5.0kg |
| Warranty | 3 years |
| Country of Origin | Japan |
| TAA Compliant | Yes |
FAQs
How much storage is included with the BUFFALO WS5220DN08W5?
The WS5220DN08W5 includes two 4TB NAS-dedicated HDDs for 8TB of installed raw capacity.
What is the factory RAID configuration?
The factory configuration is RAID 1, providing 4TB of RAID 1 storage capacity before operating-system overhead.
What operating system does the WS5220DN08W5 use?
The system runs Windows Server IoT 2025 for Storage Workgroup, a Windows Server platform optimized for storage applications.
What network ports are available?
The system provides one 10GbE RJ-45 port and two 1GbE RJ-45 ports.
How much memory does the WS5220DN08W5 have?
The NAS includes 8GB of DDR4 ECC memory and uses an Intel Atom C3338 dual-core processor.
Can the internal storage be expanded without replacing the existing drives?
No. Both available drive bays are populated with 4TB drives, so increasing internal capacity requires replacing the installed drives.
