Buffalo TeraStation 5420DN 40TB 4-Bay Desktop NAS Server (2 x 20TB)

BH #BU5420DN4002 • MFR #TS5420DN4002
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Buffalo TeraStation 5420DN 40TB 4-Bay Desktop NAS Server (2 x 20TB)
Key Features
  • 40TB Maximum Capacity
  • 4 x Drive Bays / 2 x 20TB HDDs
  • 2.04 GHz Annapurna Labs AL524 Processor
  • 8GB DDR4 RAM
Streamline your personal office productivity with the robust and scalable design of the Buffalo TeraStation 5420DN 40TB 4-Bay Desktop NAS Server. Complete with pre-installed 3.5" storage drives, the TeraStation offers ample room for your assets while also enabling you to scale capacity to your needs.
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Buffalo 5420DN External HDD Overview

Streamline your personal office productivity with the robust and scalable design of the Buffalo TeraStation 5420DN 40TB 4-Bay Desktop NAS Server. Complete with pre-installed 3.5" storage drives, the TeraStation offers ample room for your assets while also enabling you to scale capacity to your needs.

The TeraStation gives you a maximum capacity of 40TB consisting of two 20TB storage drives, giving you plenty of space for your files and information. Hot swappable design enables you to exchange drives without shutting down your entire system, essential for replacing or upgrading your system. A 2.04 GHz Annapurna Labs AL524 processor and 8GB of DDR4 RAM work together to enhance performance and provide enhanced data transfer speeds through the dual 1 GbE and dual 10 GbE RJ45 network ports. Drives can be formatted to fit various RAID profiles including 0, 1, 5, 6, 10, and JBOD, enabling you to control your storage drives and set up your ideal configuration. With 256-bit drive encryption, two-factor authentication, and flexible backup features, you can ensure your data is protected against multiple potential threats.

Connectivity
The TeraStation features two USB-A 2.0 and USB-A 3.2 Gen 1 ports, allowing you to connect a wide range of peripherals and devices for quick data management, initialization drive usage, and more.
LED Indicators
Each drive and the NAS itself provides you with real-time status using multiple LED indicators, telling you when it is safe to remove, add, and shut down your system if needed.
Certified Storage
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.
Snapshot Backup & Recovery
Snapshots can be created and used to recover data near instantaneously, with little or no system disruptions. Quickly recover single files or entire storage volumes and protect your data from user errors, file errors, and ransomware attacks.
Cloud Integration
Sync with Dropbox, Amazon S3, Microsoft Azure, and OneDrive to create a hybrid cloud for extra data security, cost savings, and versatile data backup.
UPC: 747464135854

Buffalo 5420DN External HDD Specs

Key Specs
Storage Capacity
40 TB
Included Drives
2x 20 TB SATA III 3.5" HDD
RAID
Yes: Supported RAID Modes: 0 / 1 / 5 / 6 / 10 / JBOD
Number of Bays
4x 3.5" SATA III (Hot-Swap)
Inputs/Outputs
2x USB-A 2.0
2x USB-A 3.0 / 3.1/3.2 Gen 1
2x RJ45 Gigabit Ethernet
1x RJ45 10GbE
Computing
CPU
Quad-Core: Up to 2.04 GHz
Processor
Annapurna Labs Alpine AL524
GPU
No
Memory
8 GB DDR4
Drives
Storage Capacity
40 TB
Included Drives
2x 20 TB SATA III 3.5" HDD
RAID
Yes: Supported RAID Modes: 0 / 1 / 5 / 6 / 10 / JBOD
General
Number of Bays
4x 3.5" SATA III (Hot-Swap)
Inputs/Outputs
2x USB-A 2.0
2x USB-A 3.0 / 3.1/3.2 Gen 1
2x RJ45 Gigabit Ethernet
1x RJ45 10GbE
Media Card Slots
No
PCI Expansion
No
Networking
Link Aggregation and Failover Support
No
iSCSI Support
No
Software
Installed Operating System
No
OS Compatibility
Windows 8.1 to 11
Windows Server 2012 or Later
macOS 10.13 or Later
Mobile App Compatible
No
Security
Encryption
No
Security Features
Kensington Security Slot, Lockable Bay Door
VPN Connections
No
Electrical
Input Power
100 to 240 VAC, 50 / 60 Hz
Power Consumption
100 W (Maximum)
72 W (Typical)
56 W (Idle)
Physical
Operating Conditions
32 to 104°F / 0 to 40°C at 10 to 85% Humidity
Cooling
1x Fan
Dimensions
9.06 x 8.46 x 6.69" / 23.01 x 21.49 x 16.99 cm
Weight
12.4 lb / 5.6 kg
Packaging Info
Package Weight
15.455 lb
Box Dimensions (LxWxH)
14.7 x 14.2 x 12.6"

Buffalo 5420DN External HDD Reviews

A happy purchase

By Ray
Rated 5 out of 5
Date: 2025-07-31

When I first started with pre-sales on the Buffalo Terrace station I was then introduced to B&H as a reseller. I then received a call from. boruch who assisted me help me and provided me the proposal/solution. I don’t usually remember people’s name very well, but he was very helpful and opened my eyes to a five-year warranty that I took advantage of as well Followed up on everything until I actually ordered the product and even after the product to make sure I received it Very happy with my decision and the pricing from B&H

Solid Storage, not the fastest

By Curtis
Rated 4 out of 5
Date: 2023-11-20

Bought this for work (small business). Only been using it for 1 month. It does not have any extra software like synology NAS's have, but I don't think it needs it. Appears solid, well made.

See any errors on this page?

what is the data transfer rate?

what is the data transfer rate?
Asked by: Jorn
Data transfer rates will vary depending on RAID format and connection type, but on average the Buffalo TeraStation 5420DN 32TB 4-Bay Desktop NAS Server (2 x 16TB) will have a data rate of around 600 MBps.
Answered by: Naftoli G
Date published: 2025-03-11
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