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Buffalo TeraStation 5420 4-bay desktop NAS in matte black finish

Buffalo Technology

Buffalo Technology TS5420DN4002 4-Bay 40TB NAS

SKU CH-VJ4X-XSAYC MPN TS5420DN4002

A four-bay desktop NAS with 40 TB of pre-configured storage, a 10 GbE port, and quad-core processor for business file sharing

  • CPUAnnapurna Labs Alpine Processor AL524 (2.04 GHz Quad-Core)
  • Form factor4-Bay
  • Port count1 × 10GbE
  • Power draw60 W
  • Supported standardsIEEE 802.3, IEEE 802.3u, IEEE 802.3ab
  • LAN ports1 × 10GbE + 2 × 1GbE

Included HDD Capacity 40TB (2 x 20TB)

Model Partially Populated

  • Ready to deploy with pre-tested drives and RAID configured
  • Native 10GbE port delivers high-speed transfers without cable upgrades
  • Quad-core AL524 processor and 8GB DDR4 handle demanding workloads
  • AES-256 encryption with two-factor authentication protects sensitive data
  • VMware and Windows Server 2022 certified for virtualization environments

4-Bay 40TB Business NAS

The Buffalo TeraStation 5420 arrives with two pre-tested 20TB NAS-grade drives installed and RAID pre-configured. A quad-core Annapurna Labs Alpine AL524 processor at 2.04 GHz and 8GB of DDR4 memory handle file serving, backup and virtualization workloads for small offices.

Teams needing native 10GbE and cloud sync

The single 10GbE port plus two 1GbE links suit workgroups that move large datasets without upgrading cabling. Buyers who require more than four drive bays, a second 10GbE port or GPU-accelerated applications should consider a larger platform.

Included drives and remote management console

Two 20TB drives and the pre-built RAID array eliminate initial setup time. The Remote Management System lets administrators monitor multiple TeraStations from one console, while AES-256 encryption, snapshots and two-factor authentication secure stored data.

How it compares

Measured against everything we stock in Multi-Bay Desktop NAS, at today’s prices. Recalculated every night.

Price $1,508.99
Pricier than about 77% of the 230 comparable items (median $562.49).

New to this? Paying with USDT: TRC-20 or ERC-20 — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameBUFFALO
Product lineTeraStation 5020
Model nameTS5420DN4002
Part numberTS5420DN4002
Product typeDesktop NAS
Recommended useHigh read/write performance with RAID
Processor
CPUAnnapurna Labs Alpine Processor AL524 (2.04 GHz Quad-Core)
Memory
Installed RAM8 GB DDR4
Storage
Drive interface4 x SATA (4 x Bay)
Drives included40 TB (2 × 20 TB)
Supported RAID modes0, 1, 5, 6, 10, and JBOD
Connectivity
Supported standardsIEEE 802.3, IEEE 802.3u, IEEE 802.3ab
Protocol supportTCP/IP
Ports & slots
Port count1 × 10GbE
LAN ports1 × 10GbE + 2 × 1GbE
USB ports2 x USB3.0 + 2 x USB2.0
Power
Power draw60 W
Power details100-240 VAC 50/60 Hz
Size & build
Form factor4-Bay
Product dimensions9.1 × 6.7 × 8.5 in
Product weight18.1 lb (8.21 kg)
Shipping weight7.26 kg
Package size363 × 358 × 305 mm
Compatibility
Compatible drivesOP-HD20.0N
In the box
In the boxTeraStation, Quick Setup Guide, AC Cable, Front Panel Key, and Warranty Statement
Environment & compliance
Temperature range0 °C - 40 °C
Humidity range0-80% RH non-condensing
More details
Indicator lightsPower, HDD (Hard Disk Drive), LAN (10/100)

Other versions of this model

5 more in the same range

Questions about this item

What network cabling and switch ports do I need to use the native 10GbE port on this TS5420DN4002?

Connect the 10GbE RJ-45 port with Cat6a or better cabling to a switch port that supports 10GBASE-T. The unit also includes two 1GbE RJ-45 ports for standard Gigabit links.

Can I keep using my existing 1GbE network gear while adding this NAS with its 10GbE port?

Yes. The NAS provides one 10GbE and two 1GbE RJ-45 ports simultaneously, so it will operate on your current Gigabit infrastructure while also offering a 10GbE uplink for faster clients.

How do I verify the pre-configured RAID is healthy after first power-up?

Check the front-panel LEDs: the Power LED should be solid on, each installed drive shows a steady HDD LED, and the LAN LEDs indicate link speed. Then log into the web UI to confirm RAID status and drive health.

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