| Product Type | Network Attached Storage (NAS) |
| Model | TeraStation 3420DN |
| Manufacturer | BUFFALO TECHNOLOGY |
| Form Factor | Desktop |
| Processor Type | Alpine AL214 |
| Processor Clock Speed | 1.4 GHz |
| Number of Processors | 1 |
| Installed RAM | 1 GB DDR3 |
| Total Storage Capacity | 8 TB |
| Drive Type | NAS-grade SATA HDD |
| Number of Drives Installed | 4 |
| Drive Capacity per Drive | 2 TB |
| Drive Interface | SATA 6 Gb/s |
| Supported RAID Levels | 0, 1, 5, 6, 10, JBOD |
| Power Supply Type | Internal |
| Power Requirements | AC 100–240V, 50/60Hz |
| Weight | 5.5 kg (Approx.) |
BUFFALO TeraStation 3420DN 8TB 4-Bay NAS with RAID and 2.5GbE

Key Benefits
AI-Powered Summaries from Online Customer Reviews
Eye-Insights™ are generated by proprietary AI that analyzes real online customer reviews to highlight top pros and key product features. While we aim for accuracy, insights are provided “as-is” and individual results may vary.
- Pre-tested NAS-grade drives and RAID pre-configuration reduce setup time and ensure reliability
- Includes a 3-year warranty with 24/7 US-based support, ideal for mission-critical business use
- TAA-compliant and made in Japan, making it suitable for government purchasing standards
Product Overview
The BUFFALO TeraStation 3420DN is a robust 4-bay NAS designed for small to medium businesses needing secure and dependable storage. Equipped with four pre-installed 2TB SATA hard drives, it delivers a total capacity of 8TB. These NAS-grade drives are pre-tested and RAID-configured, supporting JBOD, 0, 1, 5, 6, and 10. The device operates on a 1.4 GHz Alpine processor with 1 GB RAM, providing efficient performance for file transfers and backups over its 2.5GbE-compatible Gigabit Ethernet. With a compact desktop form factor and dimensions of 9.1 x 6.7 x 8.5 inches, it fits easily in office setups. It includes two USB 3.0 ports and an RJ-45 port for versatile connectivity. A 3-year warranty with 24/7 North American support adds reliability, and its TAA-compliance makes it suitable for government and institutional procurement. The TeraStation 3420DN delivers scalable, business-grade backup and iSCSI storage capabilities in a turnkey solution.
Specifications
Product Overview
Physical & Environmental
| Width | 9.1 in (23.1 cm) |
| Depth | 6.7 in (17 cm) |
| Height | 8.5 in (21.6 cm) |
| Operating Temperature Range | 5°C to 35°C |
| Operating Humidity Range | 20% - 80% non-condensing |
| Cooling | Internal fan |
Cloud Management & Licensing
| Cloud Backup Support | Amazon S3, Dropbox, Microsoft Azure |
| Management Interface | Web-based GUI |
| Remote Access | Buffalo WebAccess, FTP/SFTP |
| Active Directory Support | Yes |
| License Included | No license required for base software |
Interfaces
| Ethernet Ports | 1 x RJ-45 |
| Ethernet Interface Speed | 2.5 Gigabit Ethernet |
| Data Link Protocol | 2.5GbE |
| USB Ports | 2 x USB 3.0 |
| iSCSI Support | Yes |
| Supported File Sharing Protocols | SMB/CIFS, AFP, FTP, SFTP, NFS |
| Supported Operating Systems | Windows, macOS, Linux |
Compliance & Origin
| Country of Origin | Japan |
| TAA Compliant | Yes |
| Certifications | FCC, VCCI, RoHS |
| Warranty | 3 years with 24/7 North American-based support |
Advanced Security Features
| Encryption | 256-bit AES Data Encryption |
| User Access Control | Yes – User and Group-based Access |
| Network Security Protocols | SSL/TLS, HTTPS |
| Antivirus Support | Optional Add-On |