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Buffalo TeraStation 5820 8-bay desktop NAS in black finish

Buffalo Technology

Buffalo Technology TS5820DN8004 80TB 8-Bay NAS

SKU CH-Q9TB-8N60F MPN TS5820DN8004

An 8-bay desktop NAS pre-loaded with 80 TB across four 20 TB drives, a quad-core 2.04 GHz processor, 8 GB DDR4, one 10 GbE and two 1 GbE ports, plus USB 3.0 and 2.0, ready for RAID 0, 1, 5, 6.

  • CPUAnnapurna Labs Alpine Processor AL524 (2.04 GHz Quad-Core)
  • Form factor8-Bay
  • Port count1 × 10GbE + 2 × 1GbE
  • Power draw112 W
  • Supported standardsIEEE 802.3, IEEE 802.3u, IEEE 802.3ab
  • LAN ports1 × 10GbE + 2 × 1GbE

Included HDD Capacity 80TB (4 x 20TB)

Model Partially Populated

  • Pre-tested NAS-grade drives and RAID pre-configured save setup time
  • Native 10GbE port enables high-speed transfers without cable upgrades
  • VMware and Windows Server 2022 certified for virtualization deployments
  • AES-256 encryption with two-factor authentication protects stored data
  • Remote management console controls multiple devices from one interface

Eight-bay desktop NAS for business teams

The Buffalo TeraStation 5820 delivers 80 terabytes of pre-configured storage across four installed 20-terabyte drives. An Annapurna Labs AL524 quad-core processor at 2.04 gigahertz and eight gigabytes of DDR4 memory handle file serving, backup and virtualization workloads. RAID levels 0, 1, 5, 6, 10 and JBOD are supported out of the box. The unit ships with drives tested and RAID set up, so deployment starts immediately.

Upgrade from single-drive or two-bay appliances

Moving to this eight-bay platform adds native 10-gigabit Ethernet alongside two gigabit ports, removing the network bottleneck that limits smaller NAS boxes. The jump is worth it when concurrent users need sustained throughput for large media files, VM images or database backups. Four empty SATA bays remain for future expansion without replacing the chassis. Buyers who need more than eight drive slots or a rack-mount form factor cannot use this model.

Limits of 10GbE and SATA interfaces

The single 10-gigabit RJ-45 port caps peak network throughput at ten gigabits per second, so aggregated client traffic above that level will queue. Each drive bay uses SATA, so drive speed is bounded by the SATA interface rather than faster protocols. USB 3.0 and 2.0 ports provide peripheral attach points but do not extend the internal storage bus. Power draw reaches 112 watts under load, requiring a standard 100-240 volt AC supply.

How it compares

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

Price $3,138.99
Pricier than about 86% of the 230 comparable items (median $562.49).

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Specifications

Product
Brand nameBUFFALO
Product lineTeraStation 5020
Model nameTS5820DN8004
Part numberTS5820DN8004
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 interface8 x SATA (8 x Bay)
Drives included80 TB (4 × 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 + 2 × 1GbE
LAN ports1 × 10GbE + 2 × 1GbE
USB ports2 x USB3.0 + 2 x USB2.0
Power
Power draw112 W
Power details100-240 VAC 50/60 Hz
Size & build
Form factor8-Bay
Product dimensions9.06 × 11.81 × 8.46 in
Product weight23.7 lb (10.8 kg)
Shipping weight10.80 kg
Package size419 × 351 × 351 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

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Questions about this item

What rack or shelf space does the 9.06 x 11.81 x 8.46 in chassis need?

The desktop chassis measures 9.06 inches wide, 11.81 inches deep and 8.46 inches high; allow extra clearance at the rear for the AC cable and four USB ports.

Which drive bays are populated out of the box and what is the correct order for adding the remaining four?

Four 20TB drives ship pre-installed in the first four bays and the RAID is already configured; add new drives to the empty bays only after the unit has been powered off and the front panel unlocked with the supplied key.

When will the pre-installed 20TB drives or the 8GB DDR4 memory need replacement?

The included drives are covered by the manufacturer's three-year warranty; the DDR4 memory is soldered and not user-replaceable, so plan drive refreshes around the warranty period or SMART alerts.

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