BUFFALO WS5420DN32W5 – TeraStation WS5020 32TB 4-Bay 10GbE Windows Server NAS
Overview
The BUFFALO WS5420DN32W5 is a TeraStation WS5020 Series 4-bay desktop NAS configured with four 8TB NAS-dedicated HDDs for 32TB of installed storage. It runs Windows Server IoT 2025 for Storage Workgroup and provides a Windows-based file server platform for business file sharing, backup, replication, and centralized network storage.
The exact WS5420DN32W5 configuration uses software RAID and ships with RAID 5 as the default configuration. Buffalo specifies 24TB of RAID 5 capacity from the 32TB installed storage, with RAID 1 and RAID 0 also supported.
Technical Information
The WS5420DN32W5 uses an Intel Atom C3338 processor operating at 1.50GHz, with Turbo Boost up to 2.20GHz, and 8GB of DDR4 ECC memory. The four installed NAS-dedicated HDDs connect through Serial ATA III with a theoretical interface speed of up to 6Gbps.
Windows Server IoT 2025 for Storage Workgroup provides Windows-based storage and file-server functions. The platform supports Windows Server Backup, Active Directory integration, scheduled backup, replication, SMB file services, BitLocker drive encryption on supported basic disks, cloud storage integration, and remote administration through Buffalo KikiNavi.
Compatibility
The WS5420DN32W5 has four 3.5-inch drive bays, all populated with 8TB NAS-dedicated HDDs. Supported RAID modes are RAID 5, RAID 1, and RAID 0. Buffalo specifies hot swapping, while hot-spare functionality is not supported in the default RAID configuration.
Network connectivity consists of one 10GBASE-T RJ-45 port and two 1000BASE-T RJ-45 ports. The 10GbE interface supports 10GbE, 5GbE, 2.5GbE, 1GbE, and 100MbE operation. The two Gigabit Ethernet ports support 1000Mbps, 100Mbps, and 10Mbps operation. The documented network file protocol is SMB, with TCP/IP and UDP supported network protocols.
Two USB 3.2 Gen 1 Type-A ports provide up to 5Gbps of interface bandwidth. The system also includes an LCD display for link speed, drive usage, hostname/IP address, time, operating-system information, and system status.
Key Features
- 32TB installed capacity using four 8TB NAS-dedicated HDDs.
- Four-bay desktop chassis with all four drive bays populated.
- One 10GbE RJ-45 port plus two 1GbE RJ-45 ports.
- Intel Atom C3338 processor with 8GB DDR4 ECC memory.
- Windows Server IoT 2025 for Storage Workgroup with factory RAID 5 and 24TB RAID 5 capacity.
Applications
- Windows-based business file server deployments
- Centralized SMB file storage
- Scheduled Windows Server backup
- Active Directory-integrated storage
- Remote-site replication and data protection
DC Supplies Product Note
The WS5420DN32W5 is the 32TB four-drive configuration of the WS5420DN Windows Server NAS platform. Buffalo specifies four 8TB drives, factory RAID 5, and 24TB of RAID 5 capacity for this exact MPN. All four internal bays are populated, so increasing raw internal capacity requires replacing installed drives.
Specifications
| Specification | Details |
|---|
| Brand | BUFFALO |
| Part Number / MPN | WS5420DN32W5 |
| Product Type | Windows Server NAS |
| Series | TeraStation WS5020 |
| Form Factor | Desktop |
| Drive Bays | 4 |
| Included Drives | 4 |
| Drive Configuration | 4 x 8TB |
| Total Installed Capacity | 32TB |
| Drive Type | NAS-dedicated HDD |
| Drive Size | 3.5-inch |
| Drive Interface | Serial ATA III, up to 6Gbps |
| RAID Type | Software RAID |
| Factory RAID | RAID 5 |
| RAID 5 Capacity | 24TB |
| Supported RAID | RAID 5/1/0 |
| 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 Network Port | 1 x 10GBASE-T RJ-45 |
| Gigabit Ethernet Ports | 2 x 1000BASE-T RJ-45 |
| Supported Ethernet Speeds | 10Gbps/5Gbps/2.5Gbps/1Gbps/100Mbps/10Mbps |
| Network Protocols | TCP/IP, UDP |
| Network File Protocol | SMB |
| USB Ports | 2 x USB 3.2 Gen 1 Type-A |
| USB Transfer Rate | Up to 5Gbps |
| LCD Display | Yes |
| Operating System | Windows Server IoT 2025 for Storage Workgroup |
| Windows Server Backup | Yes |
| Replication | Yes |
| Failover | No |
| Active Directory Integration | Yes |
| Subfolder Access Restrictions | Yes |
| Cloud Storage Integration | Yes |
| KikiNavi Remote Management | Yes |
| KikiNavi Remote Configuration | Yes |
| Hot Swap | Yes |
| Hot Spare | No |
| Port Trunking / NIC Teaming | Yes |
| Drive Encryption | Yes, BitLocker on supported basic disks |
| iSCSI Target | Yes |
| NAS / iSCSI Target Simultaneous Use | No |
| SSD Caching | No |
| Wake on LAN | Yes |
| Maximum Power Consumption | 85W |
| Power Supply | Internal AC 100–240V, 50/60Hz |
| 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 215 x 230mm |
| Weight | Approximately 7.4kg |
| Warranty | 3 years, including HDDs |
| Country of Origin | Japan |
| TAA Compliant | Yes |
FAQs
How much storage is included with the BUFFALO WS5420DN32W5?
The WS5420DN32W5 includes four 8TB NAS-dedicated HDDs for 32TB of installed raw storage.
What is the factory RAID configuration?
The exact WS5420DN32W5 ships with software RAID 5 configured as the default, providing 24TB of RAID 5 capacity before the operating-system space used on the drives.
Which RAID levels are supported?
The system supports RAID 5, RAID 1, and RAID 0.
What operating system does the WS5420DN32W5 use?
The NAS runs Windows Server IoT 2025 for Storage Workgroup, a Windows Server platform designed for storage applications.
What network ports are provided?
The WS5420DN32W5 provides one 10GbE RJ-45 port and two 1GbE RJ-45 ports.
Does the system support hot swapping?
Yes. Buffalo specifies hot-swap support for the storage drives. Hot-spare functionality is not supported on this exact configuration.
