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TeraStation™ 3420RN

Great value, high performance NAS. 4 bay business NAS with integrated multigigabit port.

Product Data Sheet

TeraStation™ 3420RN

Great value, high performance NAS. 4 bay business NAS with integrated multigigabit port.

The TeraStation™ 3420RN is a high-performance, cost-effective 4-bay Network Attached Storage (NAS) solution, ideal for small businesses and demanding small office and home office (SOHO) users. With a powerful Annapurna Labs Alpine AL-214 1.4 GHz quad-core processor, it provides speedy transfer rates and stable operation during heavy-load work tasks. The robust central processing unit (CPU) and 1 GB of DDR3 RAM means it can run multiple services simultaneously. This allows businesses to focus on concurrent tasks with minimal performance degradation.

CPU Speed




Number of Bays


Supported RAID Levels

JBOD/ 0/ 1/ 5/ 6/ 10

Rsynch Feature

Users can make backup copies from TeraStation to a rsync-compatible device from another manufacturer. This function also allows backups to be made from another manufacturer’s rsync-compatible NAS to the TeraStation NAS.

Active Directory

TeraStation functions as a client of an Active Directory domain, so that domain users and groups can be used. This means that they can be used in domain environments of companies with up to 10,000 users and groups.

Hot-swap function increases data security

With the hot swap function, the TeraStation™ automatically switches off the defective hard disk even if one hard disk fails, so that it can be replaced safely without interrupting work or losing data.


Buffalo’s TeraStation Series features B-Sync, which allows users to easily synchronize files between their TeraStation and 3rd party cloud services to make backups. The Buffalo NAS supports Amazon S3 Cloud Services, Dropbox, OneDrive and Azure.

Including Buffalo VIP service

Replacement of defective hard disks within 24 hours

If you want to replace a defective hard disk, just let us know. If your order is in the system before 12 noon and the hard drives are in stock, they will be replaced within 24 hours. Applies within the 3 year warranty for each TeraStation and LinkStation NVR sold in the EU. (Outside the EU it can take longer).

More info

Rackmount rail set included

Intuitive web management interface

The web interface has a dashboard that offers the user more effective views of system status, the ability to resize windows (even on the phone) and a more comfortable button layout.

iSCSI target support

Works simultaneously as NAS and iSCSI target.

3 year warranty

This product has a standard warranty of 3 years. Check for other possibilities of warranty extension.

Replication with TeraStation

By replication, a folder in two separate TeraStations™ is synchronized almost in real time. This only happens in one direction (not bi-directional) – from the source to the destination. This function can be set up in LAN and WAN. WAN setup includes remote connection via port forwarding and VPN setup.

NovaStor Backup

Including 11 licenses NovaBACKUP® Buffalo Edition software. NovaBACKUP® provides small and medium-sized companies that value the protection of their digital data with a complete data security solution in one package.

Allocation of disk quota

Hard disk quotas prevent the misuse of storage space by allocating appropriate amounts of storage to users.

Other similar products:

BS-GU Series

Multi-Port Gigabit Unmanaged Switches with gigabit speeds, eco-minded features and a lifetime warranty. With 5, 8, 16 or 24 ports.

more details

BS-GUP Series

Buffalo’s BS-GUP series of multi-port gigabit PoE switches offer gigabit speeds and the convenience of Power over Ethernet.

more details

Hardware System

Form factor
CPU Type
Annapurna Labs® AL214 (Quad Core)
CPU Speed
Drive Interface
SATA 6Gb/s
Installed OS

Internal Hard Drives

Number of Drives
4 (fully populated), 2 (partially populated)
Type of Drive
Number of Bays
Total Capacity
4TB, 8TB, 16TB, 32TB
Supported HDD Capacities
1TB, 2TB, 4TB, 8TB

LAN Interface

Connector Type
LAN Ports
Max Transmission Rate
10/100/1000 Mbps

USB Interface

Connector Type
USB Type A
USB 2.0 Ports
USB 3.0 Ports
Max Transmission Rate
5 Gbps


Client OS
Windows® 10, Windows® 8.1, Windows® 7, Windows Server® 2019, Windows Server 2016, Windows Server® 2012 R2, Windows Server 2012, Mac OS X 10.11 or higher
Standard Warranty 3 years, 24 hour HDD exchange, Technical Support Hotline
430 x 44.3 x 430 mm
8.6 kg
Compatible models
OP-HD1.0N, OP-HD2.0N, OP-HD3.0N, OP-HD4.0N
Warranty extensions
Operating Environment
0-40°C, humidity 10-85% (non-condensing)
Power Supply
Internal AC 100-240V Universal, 50/60Hz
Power Consumption (max.)
100 W
Power Consumption (operation, typical)
59 W
Power Consumption (idle state, typical)
52 W
Power Consumption (standby)
0.9 W

Software System

Included Software
NASNavigator2, NovaBACKUP® Buffalo Edition
Supported RAID Levels
JBOD/ 0/ 1/ 5/ 6/ 10

Protocol Support

File Sharing
Active Directory support
Active Directory users


Failover solution with other Buffalo NAS devices
Realtime Backup
Folder Replication, Failover, Scheduled Backup, Cloud Backup
Backup Software
NovaBACKUP Buffalo Edition

Remote Access

Web UI

Product Part Numbers

Product Code
TS3420RN0404-EU - 4TB, TS3420RN0804-EU - 8TB, TS3420RN1604-EU - 16TB, TS3420RN1602-EU - 16TB, TS3420RN3204-EU - 32TB
Manuals / Setup / Latest Product Information
Documentation & Software 24-09-2019
Release notes 4.68 Windows English 28-09-2020
Release notes 4.68 Windows Française 28-09-2020
Release notes 4.68 Intel Mac English 28-09-2020
Release notes 4.68 Intel Mac Française 28-09-2020
Firmware updater 4.68 Intel Mac 28-09-2020
Firmware updater 4.68 Windows 28-09-2020
B-Sync release notes 1.02 Windows English 11-11-2019
B-Sync release notes 1.02 Windows Française 11-11-2019
B-Sync 1.02 Windows 11-11-2019
MIB files for SNMP software 28-02-2018
Boot Authentication release notes 1.00 Windows 16-11-2016
Boot Authentication Tool for TeraStation 1.00 Windows 16-11-2016
NAS Navigator Intel Mac 10.9 to 10.12 Mac OS 10.13 or later, use the Mac App Store --
NAS Navigator Windows --