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TeraStation™ 5020 Series - Rackmount 


Secure, Reliable Storage Solutions for Critical Business Needs


Avoid costly downtime, stop cyber threats, and scale data storage with the TeraStation 5020: a FIPS 140 CAVP validated business-class network attached storage (NAS) solution that comes fully equipped and ready for critical workloads.

 

Available in high-capacity and fully- and partially populated rackmount form factors, the TS5020’s offers advanced data storage and file server operations out of the box so you can store your data with peace of mind.

 

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TS5020_Datasheet_V9.pdf

Highlights

Secure Business Network Storage

Secure business-grade NAS with hard drives included, optimized to efficiently store, share, and back up critical data.

Reliable Data Protection

Built with 256-bit drive encryption, a closed system, and real-time threat detection to mitigate cyberthreats.

Deploy Out of the Box

Arrives pre-configured with RAID for quick deployment.

Instant Snapshot Backup & Recovery

Create snapshots to instantly recover files or entire storage volumes with minimal disruption, protecting against user errors, ransomware, and file corruption with Btrfs-enhanced capabilities.

Cloud Integration

Sync with Dropbox, Amazon S3, Microsoft Azure, and OneDrive for hybrid cloud setups, boosting data security, backup versatility, and cost efficiency.

Worry-Free Support & Warranty

Includes a 3-year Next Business Day warranty (including hard drives), plus 24/7 US-based 
support and data recovery services.

Quality Engineering, Made in Japan

Precision-crafted with high-quality components and fully TAA-compliant.

Overview

Enhanced Storage and Security


ts5020

The TeraStation 5020 NAS is a secure, all-inclusive turnkey data storage and file server solution designed to optimize file operations for any business environment. The TeraStation 5020 Network Attached Storage is Buffalo’s most secure NAS system yet. It runs on a closed system, with not even the system administrator having root rights. Most competitors’ devices allow third party apps to be installed, which is a possible vector for malware and other cyberthreats. The closed system on the TeraStation NAS bypasses third party apps and the potential vulnerabilities from them to keep the NAS server safe.

 

With pre-tested NAS-grade hard drives included (Enterprise-grade hard drives included for TS51220RH models) and RAID pre-configured, you get out-of-the-box reliability and data protection. The TS5020 also features high storage capacity and Btrfs file system to handle heavy data workloads.

Effortless Data Backup/Restore and Ransomware Protection


snapshots

The TeraStation 5020 utilizes snapshots to quickly save and recover data. A snapshot is essentially a copy of the system data at a given point in time. When needed, you can restore to that point using a snapshot. No matter if a file was accidentally deleted due to user error or a storage volume is locked by ransomware, you can simply revert files and folders to the previously-saved state when the snapshot was created.

 

Snapshots can be created manually or automatically, and can be restored from near instantaneously. Snapshots also take up less space than backup data, allowing you to create a library of granulated restore points for easy file versioning. No matter if it’s a week ago or an hour ago, you can quickly restore a lost or compromised file and be on your way.

Immutable Storage for Next-Level Data Protection


Protect your data from ransomware and accidental deletion with the built-in immutable snapshot feature—with no licensing fees.

 

Immutable storage ensures that data cannot be altered or deleted once written—providing next-level data protection for regulatory compliance, long-term retention, and business continuity.

 

Click here to learn more about configuring immutable snapshots.

Enhanced Login Security


2FA

The TeraStation 5020 utilizes two-factor authentication (2FA) to add a key layer of login security to ensure that only authorized users can access the NAS. When enabled, users logging in to the TeraStation will also need to enter a verification code along with their username and password.

 

This extra layer of protection helps secure data on your NAS against hackers and ransomware. 2FA can significantly improve data security for your NAS, as it ensures that your login information cannot be easily compromised by threat actors, especially if you are logging in remotely.

Certified Storage for Virtualization


2FA

Leverage the benefits of virtualization with the TeraStation 5020. Certified for VMware® and Microsoft® Hyper-V®, the TeraStation can back up your virtual environments with a highly-reliable storage solution.

 

Enable fast deployment and integration into Microsoft and VMware virtual environments, and improve working efficiency with increased virtual application performance and greater flexibility in storage capacity planning and allocation, You can also back up virtual machines to the TeraStation to protect your environment from hardware failure.

Fast Transfer Speeds with Native 10GbE


10 gbps

Multi-gigabit Ethernet can increase network performance to enable faster data transfer speeds. The TeraStation 5020 NAS with a native 10GbE port is perfect for those who are ready to commit to high-level, multi-gigabit data transfers. By using the same Cat5e cables that are already widely-installed around the office, you can enjoy notably faster network speeds within your network environment at much lower costs.

Cloud Integration for Flexible Storage and Backup


Hybrid Cloud with TeraStation

You can use the TeraStation as a private cloud to easily back up data on the network, or integrate cloud services to the NAS storage to establish a hybrid cloud. The NAS server supports popular cloud services such as Amazon S3, Wasabi, Dropbox, or Microsoft Azure/OneDrive that you already use.

 

Reap the full benefits of cloud by retaining greater control over storage capacity and scalability to store data as you see fit. You can also keep non-essential workloads and data in the cloud while storing sensitive or essential data in your local TeraStation NAS server for an extra layer of security.

Boost Performance with SSD Caching (TS51220RH Only)


10 gbps

SSD caching is a simple and powerful add-on option for the TS51220RH to boost high random data access. With an additional SSD (sold separately) installed, you can enhance your TS51220RH performance by up to 91%, greatly benefiting IOPS-demanding NAS applications such as databases, file servers, and virtual machines.

 

If you need additional IOPS, the TeraStation 71210RH with SSD caching offers up to five times the performance for the most.powerful Buffalo NAS experience.

Proactive Ransomware Protection with Real-Time Threat Detection


2FA

Stay one step ahead of cyberthreats with the TeraStation’s real-time threat detection feature, which actively identifies and notifies you of unusual file activity that could signal a potential ransomware attack:

 

  • File Count/Size/Extension Change Detection: Receive notifications if the number of files, the total size of files, or any file extensions are suddenly changed in a folder
  • Login Attempt Monitoring: Receive notifications if there are multiple failed login attempts by a certain user or IP address, with the option to temporarily block them
  • Firewall (Packet Filtering): You can now configure rules that determine which communication is permitted/denied for granulated access protection

 

The TeraStation also offers a firewall to restrict unauthorized access and an abnormal login detection feature to automatically block suspicious users or IP addresses after multiple login failures to reduce the risk of brute force attacks.

To learn about configuring real-time threat detection, click here.

Warranty and Support


TS Support

The TeraStation 5020 NAS is designed for stable 24/7 operation to keep your data available. TeraStation products are built in Japan, where each hard drive undergoes rigorous testing to ensure compatibility and reliability before being added to the chassis. TeraStation network storage are TAA compliant. 

 

Buffalo provides Peace of Mind with the industry's #1 support. Our award-winning, North America-based technical support is available 24/7. If problems arise, just give us a call and we will work tirelessly to resolve your issue. TeraStation 5020 is also backed with a free 3-year warranty (5-year warranty with product registration for TS51220RH models), with optional Next Business Day/Keep Your Drive warranty options. Warranties can also be extended up to 5 years.

Specifications

Models

Model Name

TS5420

TS51220RH

Part Numbers

TS5420RN1604
TS5420RN3204
TS5420RN4804
TS5420RN6404 
TS5420RN8004 

TS51220RH1604
TS51220RH3204
TS51220RH4804
TS51220RH6404
TS51220RH8004
TS51220RH4812
TS51220RH9612
TS51220RH12012
TS51220RH14412
TS51220RH19212
TS51220RH24012
Configuration Rackmount Rackmount
Country of Origin Japan Japan

Internal Hard Drives

Number of Drive Bays 4 12
Number of Included Drives 4 4 or 12
Capacity Range 16, 32, 48, 64, 80TB 16, 32, 48, 64, 80, 96, 120, 144, 192, 240TB
Drive Type NAS-grade HDD (CMR) Enterprise-grade HDD (CMR)
Supported RAID 0/1/5/6/10/JBOD 0/1/5/6/10/JBOD
Hot Spares Yes, with hot swapping supported Yes, with hot swapping supported

USB Interface

Standards Compliance USB 3.0 USB 3.0
Connector Type A type A type
Number of Ports 2x USB 3.0; 2x USB 2.0 2x USB 3.2; 2x USB 2.0

Performance

CPU

Annapurna Labs® Alpine Processor
AL524 (2.04 GHz Quad-Core)

Annapurna Labs® Alpine Processor
AL524 (2.04 GHz Quad-Core)
Memory 8 GB DDR4 16 GB DDR4

Environmental & Power

Power Consumption

Max 100W

Data Transfer 72W

Idling 63W

Max 500W

Data Transfer 177W

Idling 135W

Power Supply Internal AC 100-240V, Universal 50/60Hz

Internal AC 100-240V, Universal 50/60Hz

Optional dual power supply available

Operating Temperature 32˚ - 104˚F (0˚ - 40˚C) 32˚ - 104˚F (0˚ - 40˚C)
Operating Humidity 10 - 85% non-condensing 10 - 85% non-condensing

Shipping

Unit Dimensions (L x W x H) 16.93 x 16.93 x 1.74 in 29.0 x 18.9 x 3.4 in
Unit Weight 18.69 lbs 55.37 lbs
Package Dimensions (L x W x H) 23.03 x 21.26 x 7.87 in 38.5 x 22.9 x 10.2 in
Package Weight 27.2 lbs 66.5 lbs
Warranty 3 Years 5 Years (with product registration)

LAN Interface

Standards Compliance IEEE802.3an (10GBASE-T), IEEE802.3bz (5GBASE-T/2.5GBASE-T), IEEE802.3ab (1000BASE-T), IEEE802.3u (100BASE-TX), IEEE802.3 (10BASE-T) IEEE802.3an (10GBASE-T), IEEE802.3bz (5GBASE-T/2.5GBASE-T), IEEE802.3ab (1000BASE-T), IEEE802.3u (100BASE-TX), IEEE802.3 (10BASE-T)
Number of Ports 1 (10GBASE-T), 2 (1000BASE-T) 2 (10GBASE-T), 2 (1000BASE-T)
Data Transfer Rates 10 Gbps/1000 Mbps/100 Mbps/10 Mbps 10 Gbps/1000 Mbps/100 Mbps/10 Mbps
Supported Protocols TCP/IP TCP/IP
Network File Services CIFS/SMB, AFP, FTP/FTPS/SFTP, NFS CIFS/SMB, AFP, FTP/FTPS/SFTP, NFS
Connector Type RJ-45 RJ-45

Product Features

Email Notifications  Yes  Yes
Btrfs Filesystem  Yes  Yes
Port Trunking  Yes  Yes
Rapid RAID change  Yes  Yes
Replication  Yes  Yes
Failover  Yes  Yes
UPS  Yes (USB/Network)  Yes (USB/Network)
Active Directory  Yes  Yes
Cloud Service Integration  Yes (Dropbox, Amazon S3, Wasabi, Microsoft Azure and OneDrive)  Yes (Dropbox, Amazon S3, Wasabi, Box, Microsoft Azure and OneDrive)
Boot Authentification  N/A  N/A
SNMP  Yes  Yes
Snapshots  Yes  Yes
Snapshot Backup  Yes  Yes
Settings Migration from Old TeraStations  Yes  Yes
Remote Management Service  Yes  Yes
Remote Configuration  Yes  Yes
Abnormal Login and File Activity Detection  Yes  Yes
iSCSI  Yes  Yes
iSCSI Backup  Yes  Yes

Server Backup Software Compatibility

Arcserve ArcserveBackup Version r18.0
Arcserve UDP Version 8.0
Acronis Acronis Cyber Protect Version 15
VERITAS Backup Exec Version 21
System Recovery Version 21

Client OS Support

Client OS Support

Windows® 11 (32-bit/64-bit), Windows® 10, Windows® 8.1 (32-bit/64-bit)

Windows Server® 2022, Windows Server® 2019

Mac® OS® X 10.13 or later

Windows® 11 (32-bit/64-bit), Windows® 10, Windows® 8.1 (32-bit/64-bit)

Windows Server® 2022, Windows Server® 2019

Mac® OS® X 10.13 or later

Accessories

Remote Management Service Available for Free Available for Free
Compatible Hard Drives OP-HDN Series OP-HDHU2 Series
Additional Power Supply Not available for 4-bay model OP-PU-10R2UWR
Compatible SSD (for SSD Cache) Not available for 4-bay model OP-NVSSD Series
Optional Warranty Service Extended options available Extended options available

Box Contents

Included Materials

TeraStation, Quick Setup Guide, AC Cable, Front Panel Key, and Warranty Statement

TeraStation, Quick Setup Guide, AC Cable, Front Panel Key, and Warranty Statement
Included Software  NASNavigator2, NovaBACKUP® Buffalo Edition (One server and ten workstation licenses - available for download after product registration) NASNavigator2, NovaBACKUP® Buffalo Edition (One server and ten workstation licenses - available for download after product registration)
Additional For compliance documents such as RoHS Declaration, Certificate of Volatility, Certificate of Conformance, or others please contact sales@buffaloamericas.com. For compliance documents such as RoHS Declaration, Certificate of Volatility, Certificate of Conformance, or others please contact sales@buffaloamericas.com.

Resources

TeraStation Full Lineup

TeraStation Comparison Chart

TeraStation to Amazon S3 Cloud Integration

TS_to_3rd Party Cloud Support

Value of Hard Drives Included

Why Buffalo NAS

Compatible UPS

UPS compatibility list for TeraStation x10 series

TAA and FIPS Compliance Information

Buffalo Compliance Information

Product Visio Stencils

Download Stencils

Value of Hard Drives Included

Buffalo Branded Drives

Check RAID Configurations

Downloads

Firmware

    File Size Post Date Version OS Support Notes
2025-05-13 2.98 Windows TS5020/3030 Series Windows Firmware Note: Firmware version 2.98 serves as a prerequisite update for upgrading to version 3.00 or later. After updating to version 2.98, immediately update to version 3.00 or later. Do not use TeraStation units running firmware version 2.98. SHA-256 Hash 5ECB523A8AE3C8C78AD311D244C06DC69940D4585C90B8EACE539D9F20B8E169
2025-05-13 2.98 Mac TS5020/3030 Series Firmware Mac version Note: Note: Firmware version 2.98 serves as a prerequisite update for upgrading to version 3.00 or later. After updating to version 2.98, immediately update to version 3.00 or later. Do not use TeraStation units running firmware version 2.98. SHA-256 hash 196747F7662F9E7016C1F674312DBABB66449208208C38403B52FF8A3243BF7E
2025-12-11 3.08 Windows TS5020/3030 Series Windows Firmware Note: If your unit’s firmware is not yet version 2.98, update it to version 2.98 first. SHA-256 Hash E9C69391531992AA0B63DF4659BE0293D43B7F064A8EF1B97B06CE9EA4191008
2025-12-11 3.08 Mac TS5020/3030 Series Firmware Mac version Note: If your unit’s firmware is not yet version 2.98, update it to version 2.98 first. SHA-256 hash 0B0D8AE46E9BF407FFE9ED1251EE17FC242B7E235FF7827CEB5D2032688EF1D8

Documentation

    File Size Post Date Version OS Support Notes
2022-03-31 For certificates and compliancy lists including volatility and RoHS, please email us at sales@buffaloamericas.com.
2022-12-19 Manuals, Quick Setup Guide, and additional software for TeraStation 5020series
2025-05-13 2.98 Windows TS5020/3030 Firmware Update Readme Note: Firmware version 2.98 serves as a prerequisite update for upgrading to version 3.00 or later. After updating to version 2.98, immediately update to version 3.00 or later. Do not use TeraStation units running firmware version 2.98.
2025-05-13 2.98 Mac TS5020/3030 Firmware Update Readme Note: Firmware version 2.98 serves as a prerequisite update for upgrading to version 3.00 or later. After updating to version 2.98, immediately update to version 3.00 or later. Do not use TeraStation units running firmware version 2.98.
2025-12-11 3.08 Windows TS5020/3030 Firmware Update Readme Note: If your unit’s firmware is not yet version 2.98, update it to version 2.98 first.
2025-12-11 3.08 Mac TS5020/3030 Firmware Update Readme Note: If your unit’s firmware is not yet version 2.98, update it to version 2.98 first.
2025-10-09 3.1.2 Windows Readme for NAS Navigator for Windows
2019-07-18 2.99 Windows Lisez-moi pour NAS Navigator pour Windows (français)
2019-07-18 2.99 Mac Readme for NAS Navigator for Mac NOTE: For users running MacOS 10.13 or later, download and install the latest version of NAS Navigator2 from Mac App Store.
2019-07-18 2.99 Mac Lisez-moi pour NAS Navigator pour Mac (français) REMARQUE: pour les utilisateurs d'ordinateurs sous MacOS 10.13 ou ultérieur, téléchargez et installez la dernière version de NAS Navigator2 à partir du Mac App Store.
2019-11-11 1.02 Windows Readme for B-Sync for Windows
2019-08-30 1.10 Windows English readme for TS6000 snapshot agent
2019-08-30 1.10 Windows Lisez-moi français pour l'agent de capture instantanée TS6000
2025-03-25 1.02 Windows Readme for Remote Management Service Remote Settings Connection App
2026-02-23 UPS compatibility list for Buffalo NAS
2026-03-11 Link to setup guides for OP-PU-10R2U Replacement Power Supply

Utilities

    File Size Post Date Version OS Support Notes
2025-10-09 3.1.2 Windows NAS Navigator for Windows - Self extracting installer. SHA256 hash f9927bb6c1ee10a9c2be1858cb6db2f24a43c05bb5df3c3c7676ae843808bbcd
2019-07-18 2.99 Mac NAS Navigator for Mac NOTE: For users running MacOS 10.13 or later, download and install the latest version of NAS Navigator2 from Mac App Store. SHA256 Hash: A234CBCBF1B185F8594848A809C629E8A3B67683B86D4A591E2A2E106D38CADA
2024-07-12 202003090000z.1201 Private MIB definition file for TS3000, TS5000, TS7000 (TS-2RZ), TS3010, TS3020, TS5010, TS5020, and TS7010 series TeraStations and 700 Series LinkStation
2017-01-04 Link to registration page for all Buffalo products including switches and extended warranties. Also includes setting to provide license information for Novastor NovaBackup software if eligible.
2018-06-01 Windows Download page for the Buffalo Network QuickView software.
2019-11-11 1.02 Windows B-Sync is an application that creates shared links for files stored on the TeraStation. Using the "B-Sync" software will allow you to share files on the TeraStation with users who are not on the same network as the TeraStation.
2019-08-30 1.10 Windows Snapshot agent for TeraStations
2025-03-04 1.02 Windows Remote Management Service Remote Settings Connection App. SHA-256 Hash: 7B471881570137EDD79640B5D82EB22924C82D6F6EBDF501966091798AC80B15

Variations


TeraStation™ 5020 Rackmount NAS (4-bay) 16TB

  • - Rackmount
  • - 4
  • - NAS
  • - 16

TeraStation™ 5020 Rackmount NAS (4-bay) 32TB

  • - Rackmount
  • - 4
  • - NAS
  • - 32

TeraStation™ 5020 Rackmount NAS (4-bay) 48TB

  • - Rackmount
  • - 4
  • - NAS
  • - 48

TeraStation™ 5020 Rackmount NAS (4-bay) 64TB

  • - Rackmount
  • - 4
  • - NAS
  • - 64

TeraStation™ 5020 Rackmount NAS (4-bay) 80TB

  • - Rackmount
  • - 4
  • - NAS
  • - 80

TeraStation™ 5020 Rackmount NAS (12-bay) 32TB - 4 drives included

  • - Rackmount
  • - 12
  • - Enterprise
  • - 32

TeraStation™ 5020 Rackmount NAS (12-bay) 48TB - 4 drives included

  • - Rackmount
  • - 12
  • - Enterprise
  • - 48

TeraStation™ 5020 Rackmount NAS (12-bay) 64TB - 4 drives included

  • - Rackmount
  • - 12
  • - Enterprise
  • - 64

TeraStation™ 5020 Rackmount NAS (12-bay) 80TB - 4 drives included

  • - Rackmount
  • - 12
  • - Enterprise
  • - 80

TeraStation™ 5020 Rackmount NAS (12-bay) 96TB - 12 drives included

  • - Rackmount
  • - 12
  • - Enterprise
  • - 96

TeraStation™ 5020 Rackmount NAS (12-bay) 144TB - 12 drives included

  • - Rackmount
  • - 12
  • - Enterprise
  • - 144

TeraStation™ 5020 Rackmount NAS (12-bay) 192TB - 12 drives included

  • - Rackmount
  • - 12
  • - Enterprise
  • - 192

TeraStation™ 5020 Rackmount NAS (12-bay) 240TB - 12 drives included

  • - Rackmount
  • - 12
  • - Enterprise
  • - 240

TeraStation™ 5020 Rackmount NAS (12-bay) 16TB - 4 drives included

  • - Rackmount
  • - 12
  • - Enterprise
  • - 16

TeraStation™ 5020 Rackmount NAS (12-bay) 48TB - 12 drives included

  • - Rackmount
  • - 12
  • - Enterprise
  • - 48

TeraStation™ 5020 Rackmount NAS (12-bay) 120TB - 12 drives included

  • - Rackmount
  • - 12
  • - Enterprise
  • - 120

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