BUFFALO TeraStation 3420DN 4-Bay SMB 8TB (4x2TB) Desktop NAS w/Hard Drives Included Network Attached Storage
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Capacity: 8TB (4x2TB)
Style: Fully Populated
Features
- Professional Grade Network Attached Storage: Optimized to organize, store, share, and back up your important files.
- Reliable Storage w/ Effortless Setup: RAID 1 pre-configured for out-of-the-box protection to save you time and effort. iSCSI support for server storage expansion.
- Purpose-Built for Data Protection: Features 256-bit drive encryption, a closed system, and flexible replication and backup features to keep your data safe.
- 8 TB Capacity 4 pre-tested, NAS-grade hard drives included. Ships in RAID 5 for 6 TB usable capacity; can change to RAID 6 for more redundancy, or RAID 0 for full 8 TB.
- Peace of Mind Included: 3-year warranty (includes hard drive coverage) with 24/7, award-winning US-based support. (Additional warranty options available.)
- Made in Japan - Quality made data storage.
- Fast Data Transfers: Native 2.5GbE port for high speeds with no cable upgrade needed.
- Remote Management Service: Save time and resources by managing multiple NAS from a single console.
- Data Recovery Service: Qualifies for free simple logical data recovery with award winning support when registered.
Features
- Reliable Business-Class NAS: Optimized to organize, share, and back up your important files. Closed OS for increased security.
- Pre-tested NAS-grade hard drives included with RAID pre-configured - saving you time and effort.
- 8 TB 4 drives included - ships in RAID 5 = 6 TB usable capacity. Set to RAID 6 for more redundancy, or RAID 0 for full 8 TB.
- Back up and share multiple PC, Mac, Android and iOS devices.
- Made in Japan - Quality Devices.
- 3-year warranty (Includes HDD coverage) with 24/7 US-based support. (Additional options available.)
- Qualifies for Buffalo's Data Recovery Service when registered.
- Remote Management System: Manage multiple NAS from a single console.
- Annapurna Alpine Processor AL214 (1.4 GHz Quad-Core) with 1 GB DDR3 RAM.
Description
Buffalo's TeraStation 3020 series is an easy-to-use NAS storage and backup solution with NAS-grade hard drives and professional security features. Designed for an operating environment of 10-30 users, this Network Attached Storage system is built to provide quality hardware components, versatile data management functions, and secure data protection features at an entry level price - perfect for small offices and professional users requiring secure and cost-effective network storage or a secure private cloud.
Hard Drive: 8 TB
Brand: BUFFALO
Series: TeraStation 3420DN
Item model number: TS3420DN0804
Hardware Platform: PC, Mac
Item Weight: 9.7 pounds
Product Dimensions: 9.1 x 6.7 x 6.7 inches
Item Dimensions LxWxH: 9.1 x 6.7 x 6.7 inches
Manufacturer: BUFFALO
Date First Available: October 15, 2020
Digital Storage Capacity: 8 TB
Hard Disk Interface: Ethernet
Connectivity Technology: Ethernet
Brand: BUFFALO
Special Feature: 2.5 GbE, NAS-Grade Hard Drives Included
Hard Disk Form Factor: 3.5 Inches
Hard Disk Description: Mechanical Hard Disk
Compatible Devices: Laptop, Desktop, Windows, Mac, Linux
Installation Type: Ethernet NAS Device
Hard Disk Size: 8 TB
Hard Drive: 8 TB Mechanical Hard Disk
Brand: BUFFALO
Series: TeraStation 3420DN
Item model number: TS3420DN0804
Hardware Platform: Mac, PC
Item Weight: 9.7 pounds
Product Dimensions: 9.1 x 6.7 x 6.7 inches
Item Dimensions LxWxH: 9.1 x 6.7 x 6.7 inches
Hard Drive Interface: Ethernet
Hard Drive Rotational Speed: 5400
Manufacturer: BUFFALO
Date First Available: October 15, 2020
Frequently asked questions
This product is currently out of stock. Please check back later for shipping info.
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Reviewed in the United States on November 20, 2025 by Suwit Beathaisong
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Firstly, you get so much value with this item. I ordered the 4 drive 8TB (4X2TB drives) as a file server for my small business. The machine is made in Japan which gives me confidence in its quality, and although this NAS is small, it is hefty, solid and well built. Out of the box you don't get much by way of what to do with it. There is only a quick setup on how to plug it in, but nothing about what to do with it. Visit this site to get started. buffalotech.com/products/terastation-3020-series-desktop I used to help manage a large network years ago, and we installed Buffalo terrastations so I had some experience with them, but really, this unit is super easy to configure and is packed full of value added services such as links to popular cloud storage services, virus protection from TrendMicro, notifications, and several other enterprise level options. The unit comes preconfigured RAID 5 with options for RAID 5 + Hot Swap, and RAID 6 which I chose during setup. I'm a bit rusty with my tech knowledge, and this NAS was a breeze to setup. I highly recommend this product for small businesses and personal file storage use. I would not recommend it for enterprise use as it's missing some redundant features to prevent downtime. Overall, Ding Dong.
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Reviewed in the United States on September 8, 2022 by M. Robles
Capacity: 8TB (4x2TB)
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Quality NAS, fast and well designed software. The 4 bays and raid 5 is the best value, this system works so reliable and also future proves with 2.5GE port plus 1GE port aggregation. I have it for a few months and have not seen a small hick up. Highly recommended!
Reviewed in the United States on April 24, 2021 by CN
My photo/video file had exceeded the capacity of my computer's hard drive, so I purchased the Buffalo TeraStation to offload the pictures and videos. I also chose a NAS to allow my wife to access these files on my home LAN. The TeraStation setup is not for amateurs. Be prepared to read some complex manuals and call tech support a few times to get it working as you want. Also, be aware that the tech support guys are used to dealing with IT professionals (I think Buffalo products are more geared toward business applications than home use), and they lose patience with you quickly. On one support call, I gave one of their techs direct access to my computer. He started making changes right and left to the TeraStation setup and my computer without explaining what he was doing. It fixed my problem, but I had no idea how to fix it myself should it reoccur. When their techs get hold of a rookie, they want to fix the problem and move on to the next call. My biggest ongoing complaint is that you must reconnect the device to your network every time the computer restarts, be it from a power failure, reboot following a software update, or normal shutdown at the end of the day. It doesn't connect automatically. That's a problem when routines presume the device is always connected. For example, my Mac does backups on an external hard drive using a program called "Time Machine." I can store that backup on this device unless I am there to reconnect it whenever the computer is restarted. If you have a commercial application for a NAS, TeraStations are very reliable, but if it is for home use, I recommend you go a different way.
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Reviewed in the United States on May 22, 2024 by Zenzation
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Been working fine. Little difficult tot install, but finally got it working. No failures yet.
Reviewed in the United States on December 13, 2025 by B-Rad
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The raid finally died on my old terrastation I ran out of spare drives. I bought a couple of spares for this one. The old on lasted around 15 years 10 of those years has at a business with 50 users till we upgraded to a larger server.
Reviewed in the United States on July 20, 2025 by squaredancer
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The package arrived today about 2 PM. Followed the directions to get this thing up and running in the "Quick Start Guide" and the device immediately bricked in the middle of setup. Tried contacting Buffalo Customer Service, but of course they're not answering on a Sunday. I did receive some voicemail message to the effect that they were "having an emergency." That did not instill confidence. I've been working on getting this thing running literally ALL DAY LONG (it is now 11 PM). After several hours of Googling, reading tons of forum messages, and downloading random utilities, I am able to get this device to boot into what they call "Emergency Mode." Basically it's turned on and connected to the network but all of the storage is inaccessible. So, apart from that, a few things to note: - This thing comes with mechanical WD hard drives, *NOT* SSDs. If you want SSDs, this is definitely not your storage solution. On a side note, I don't know if they've gotten any better, but I have had a terrible history with WD mechanical hard drives and was extremely happy to finally get away from them and move on to SSDs. Until I bought this thing. - The mechanical hard drives goes a long way to explaining the 17+ pound weight of this thing. I also assume my electricity consumption is about to jump through the roof. - For some reason Buffalo has decided to use HTTP instead of HTTPS, meaning all of your communication over the wire is unencrypted and insecure. Need to download a driver from their website? You literally have to do it over HTTP (oh, I tried HTTPS). Prompt to change your password on the NAS? Let's just send that password over the wire unencrypted via HTTP. Do not buy this device if security is important to you in any way. I bought Buffalo because they were highly rated by the Chicago Tribune. That was a mistake. To be honest I have not been so disappointed in a technology purchase in over a decade. Based on my first 9 hours of watching this 17-pound paperweight flash Red warning signals at me during setup, I am less than confident it will last 9 hours of actual use, if it ever actually works.
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Reviewed in the United States on June 7, 2021 by Mike C