$ 1,531.25
$ 1,392.00

SimplyNAS Terramaster D4 Thunderbolt 3 40TB integrated w/ 4 x 10TB High Performance Enterprise drives, with RAID 0/1/5/10/JBOD/SINGLE options.

Product Features

  • Processor: Intel®
  • Read Speed: 780MB/sec
  • Write Speed: 698MB/sec (Use SSD under RAID 0 mode)
  • Thunderbolt 3 Port: 2
  • DP Interface: DP1.2
  • Data transmission interface: Thunderbolt 3 *2
  • Drive Bay: 4 x 3.5-inch/2.5-inch SATA 6Gb/s, 2.5-inch SSD
Availability: Out Of Stock
Sku: SNTM-D4T3-410ES
SimplyNAS Integrated
MPN: D4 Thunderbolt 3


Main System:

The SimplyNAS version of the TerraMaster’s D4 Thunderbolt™ 3 is equipped with a 40-Gbps lighting speed interface will support SSD’s/HDD’s and can be pre-built by SimplyNAS to your exacting capacity needs.  Increasing capacity beyond bays is easy as it can daisy chaining across multiple Thunderbolt™ 3 devices, and each one can be realized using the Thunderbolt interface. The D4 T supports multi-screen display with up to 3 screens, an ideal solution for multitaskers.

The supported HD DP digital interface, video editors can connect the D4 Thunderbolt™ 3 to a 4K HD display to satisfy their needs. Multiple RAID support eradicates the concern for data protection with support for RAID 0, 1, 5, and 10, as well as JBOD disk array modes for all your application needs.

The D4 Thunderbolt™ 3 is ideally suited for the most demanding applications, including 4K video editing, as well as seamless 4K streaming. Ideally suited for users that need a no-nonsense RAID based Thunderbolt 3 solution with speed and capacity to boot. Look no further.


4 x Award Winning 10TB Seagate/Toshiba Enterprise drives with 40 Terabytes (TB) of raw capacity.


NASBIT service at no extra charge – we install the drives, configure with RAID and burn test the system for 24-48hrs and then the final Q&A, double pack system for protection against damages in shipping and you are ready to use the out of the box.

Large Storage Capacity

TerraMaster's 4-bay D4 Thunderbolt 3 is compatible with 3.5" SATA disks and 2.5" SSDs, allowing professionals to capitalize on a total storage capacity of up to 64TB. As a result, you can be assured the device gives you the tools you need to overcome any storage challenge.

Lighting Speed!

The D4 Thunderbolt™ 3 is equipped with a 40-Gbps lighting speed interface,   and the read and write support attains speeds of up to 780 MB/s (test conditions: 5 SSDs, RAID 0 mode). The device is compatible with daisy chaining across multiple Thunderbolt™ 3 devices, and each one can be realized using the Thunderbolt interface.

Multi-Screen Display

Capitalising on the Thunderbolt™ 3 and DP interfaces, the D4 Thunderbolt 3 supports multi-screen display with up to 3 screens. This is an ideal solution for multitaskers, especially when efficiency is the end goal.

Dedicated DP Interface

Given its HD DP digital interface, video editors can connect the D4 Thunderbolt™ 3 to a 4K HD display to satisfy their needs.

Multiple RAID Supports

The D4 Thunderbolt 3 can operate with RAID 0, 1, 5, and 10, as well as JBOD disk array modes for all your application needs. This underpins the all-important concern for guaranteed data security, and it ensures that your storage capacity is utilized in the most efficient way possible.

Professional and Safe

Replacing lost content is inconvenient, costly, and, ultimately, unworkable for all professionals. Therefore, with the D4 Thunderbolt™ 3, TerraMaster has not comprised on its use of state-of-the-art storage technologies to ensure data safety and security. Now, freed from concerns about inadequately protected data, users can focus on what matters to you.

The Ideal Companion for All Professionals

Given its compactness, its large storage capacity, and its lightning speed, the D4 Thunderbolt™ 3 is ideally suited for the most demanding applications, including 4K video editing, as well as seamless 4K streaming. Other users, especially those with strict speed and storage requirements, will find a valuable partner in this device.

Authoritative Quality Certification

Both Apple and Intel have certified the D4 Thunderbolt™ 3's design and performance, ensuring the device's consistent performance and reliability.

Exclusive worry-free warranty

Brand new replacement for 2 years, quick service in 24 hours!

D4 Thunderbolt 3

Key Components


Intel Thunderbolt 3

Number of hard disks


Compatible hard disks

3.5-inch SATA hard disk drive

2.5-inch SATA hard disk drive

2.5-inch SSD

Max. storage capacity

64TB (16TB HDD * 4, the net capacity may vary according to RAID type)

External Port

Data transmission interface

Thunderbolt 3 *2

Data cable

40Gbps Thunderbolt Cable, length: 0.8m

DP interface


Power interface


File System

HDD format

FAT 32, FAT 16, NTFS, and EXT4

Read-write speed (max.)

Read: 780MB/sec

Write: 698MB/sec (Use SSD under RAID 0 mode)

Operating System

Supported operating systems

64-bit Windows 8/10; Mac OS 10.12 (or later version)


Device size

227 x 225 x 136 mm


Net weight: 2.45 kg  

Gross weight: 3.93 kg

System fan

80 mm x 80 mm x 2 Pcs

Fan type

Temperature controlled

Noise level

19.5 dB (A)

Shell material

Aluminum alloy

Power Supply

Input voltage

100V ~ 240V AC

Current frequency

50/60 HZ, single-frequency


Operating mode: 76.8W  

Sleep mode: 2.6W (five 2TB hard disks)


RAIDs supported

RAID 0, RAID 1, RAID 5, RAID 10, JBOD, and Single

RAID online expansion

RAID 1, RAID 5 , and RAID 10

RAID migration

Single to RAID 1

Single to RAID 5

RAID 1 to RAID 5

RAID auto-rebuilding

HDD hot plug

HDD sleep

HDD S.M.A.R.T. inspection

Sector inspection and parity check

Read-write cache

Daisy chain cascading

HDD NCQ technology

Email alert notice

Event log

Ambient Temperature

Working temperature

5 °C ~ 40 °C

Storage temperature

-20 °C ~ 60 °C

Relative humidity

5% ~ 95% RH


CCC, CE, FCC, and UL

Warranty Period

2 years

Environmental Protection and Packaging

RoHS Compliance

Packaging List

Product unit * 1

Quick installation guide * 1

Accessories package * 1 (screws)

Power supply * 1

Power cord * 1

Thunderbolt cable (40Gbps) * 1

Customer Reviews

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The Case for buying an Integrated NAS System from SimplyNAS

Buying a NAS doesn't have to be complicated or stressful. This may only occur at times when looking to buy a diskless NAS as the risk element of receiving a faulty NAS or drives are accentuated. Nothing wrong in buying a diskless NAS and adding your own drives, the savings made may offset the inconvenience of receiving faulty NAS/Drives and having to go deal with returns, or does it? The argument against buying a diskless and self-populating with drives is quite compelling.

Disk Drives:

  • We ensure all drives are compatible with the relevant manufacturer, model provide conformity with the relevant compatibility guidelines.
  • All our disk drives are sourced from manufacturer recommended distributors – we don't buy aftermarket drives or purchase on open grey markets.
  • All our disk drives are sourced from manufacturer recommended distributors – we don't buy aftermarket drives or purchase on open grey markets.
  • Our comprehensive batch rotation ensures customer avoid batch issues and thus promote reliability and longevity.
  • Our methodology for configuration, setting RAID and in-depth burn testing process for disk drives and NAS servers is unsurpassed and the small premium paid for this service is worth its weight in gold.

NAS Servers:

  • We are authorized partners for all the NAS servers we stock.
  • We only sell and support NAS solutions, as a specialist our knowledge is unsurpassable.
  • Our expertise within the technical arena for NAS servers, provides the glue for preventing our customers from making an incorrect buying decision, as we share our knowledge.
  • Our extensive and professional burn-testing service ensure the optimization and deployment of both NAS and Disk Drives is done to provide peace of mind and total integration.
  • Ready to use out of the box, no if's or buts.

Thinking of buying a NAS?

QNAP, Synology, QSAN and TerraMaster – Over fourteen Comprehensive years relationship culminating in our expertise of understanding all the NAS products, and skillfully combining performance, reliability and features to ensure our NAS experts are always at hand to help our customers optimize their storage needs.

At SimplyNAS we balance performance, reliability and compatibility to ensure customers get optimized NAS based disk solutions that perfectly match their Storage needs. All our pre-configured NAS systems are evenly balanced in the areas that really matter.
Call our NAS experts today at 407-960-4690

What is NASBIT?

NASBIT© is a Licensed trademark of SimplyNAS. The acronym stands for Network Attached Storage Burn in Testing. This term is used to describe the process of testing new Network Attached Storage (NAS) hardware and firmware for faults before putting it to use in a live environment. This is done by running 'Stress testing' software for a stipulated period of time often 24 to 48 hours, but longer if needed.

When we receive an order for a NAS system pre-installed with disk drives it's prepared and configured with RAID followed by burn testing to ensure the entire system undergoes a thorough examination thus ensuring the server passes all tests to the highest standards set by us. Should the system hardware or any associated components fail at any point of the testing cycle the system is pulled and returned back as faulty our relevant vendor partner, the process seems simple but setting it up is far from easy.

Hard Disk Drives

All Hard disk drives are pre-tested prior to integration; the smallest of faults be it tolerable within industry standards are classified by us as faults, the hard drive is rejected and eliminated from the process and again returned back to source as a D.O.A. (dead on arrival). We continue to select drives from different batches, so as to eliminate any bad batches that may have been produced during manufacturing.

One integrated the drives are put through a vigorous routine that includes stress testing, including temperature tests and a host of read, writes to ensure the drive platters are stressed to the nth degree.


First, when the new server is turned on, we boot off of the network, and proceed to run the memory test that takes its sweet time, almost 10-12 hours dependent on manufacturer and model.


The appropriate RAID level is set and the system awaits completion of RAID synchronization. Once completed the NAS server undergoes numerous re-boots and a deletion of original RAID and a final re-build of RAID level again.

Why is NAS Burn in Testing (NASBIT©) necessary?

If within the designated time span the NAS servers are still running and with zero faults, it is considered suitable for rolling out to our customers. If there is a failure of any kind the systems is replaced with a new one, including hard drives and the process starts again, until the NAS servers passes with ZERO faults.

You would normally expect that this level of testing would be completed by the hardware manufacturers and so these tests shouldn't show up any faults. In our experience of testing hundreds of machines we do find faults, and we do send systems back.

The reason it is so important to perform this level of testing on NAS servers is that the uptime demands are so high. The slightest faults will cause outages and downtime. Once a NAS server is deployed, never again will you have the opportunity to take it offline and perform such detailed testing. Even if it were to crash, there is always a demand that it be put back online as quickly as possible, not left offline whilst thorough diagnostics are completed.

Always remember this is hardware and failures can and will occur even after burn testing has been carried, that is a fact of life we cannot avoid, but we do try and eliminate some of the hassle factor with testing. Thank you for buying from us, we truly appreciate your custom.

Copyright 2020 by SimplyNAS all rights reserved. Federal copyright law prohibits unauthorized reproduction by any means and imposes fines up to $25,000 for violation.

We try our best to get orders shipped as quickly as possible and if something is not in stock at our FL warehouse, we can ship directly from our suppliers usually within 1 - 2 business days, if not the same day. However, due to the current situation with the Coronavirus, some manufacturers are experiencing stock constraints, shipping delays due to warehouse closures, delays in customs or other unforseen circumstances which can sometimes delay an order as stock levels can change hourly. We understand that your order may be urgent, so if you want to check if something is in stock before you place your order, please call us at 407-960-4690 during our normal business hours of 9-6PM EST. We also try to be transparent on the site with availability and shipping times. We do sometimes make mistakes and greatly appreciate your understanding if this occurs. Please allow some grace and patience as we work through the difficulties and challenges of communicating with our suppliers to keep up with supply changes.

So when can I expect a shipping notification for my order?

  • Diskless orders that are in stock will ship same day if placed before 2pm.
  • Diskless units that are not in stock we will ship directly from our suppliers warehouses. This could delay shipping by 1 - 3 business days.
  • Configured systems are considered special order. This means that they are not already pre-built and ready to ship when you place an order. When you purchase a configured system from us it will not ship out for at least 2 - 3 business days due to the time it takes to pick, assemble, test, RAID and prepare your order for shipment. If we do not have one of the components on the build, that will further delay shipment as we have to wait for stock to come to us. You will receive updates for the order as it goes into testing.

When will my card be charged for an order?

We do not immediately charge your credit card when you submit an order, instead a temporary hold is placed on your card for the amount of the purchase. If everything is in stock, we will charge your card and process you order for building or shipment. Should there be a delay of some sort, we will notify you by email with the ETA and ask for approval to charge your card and process your order. Please be advised that we cannot allocate stock to you without prepayment. So, if you approve the ETA, we will immediately charge your card so that we can secure the stock from our suppliers. Once this charge occurs, any cancellation will incur a 3% fee.

Security and Payment Verification Requests

We take customer security very seriously as fraud and chargebacks are costly. In order to protect you and keep our costs to a minimum, we may ask you to verify your identity when you place an order. If your billing and shipping differ, or if the billing and shipping parties differ and we can't veryify you as a legitimate business, we will send a request by email with a link, asking you to upload documentation for us. We understand that this may make some people nervous, but you are sending your files to the same secured server as your payment and no one can access the files except for the staff who verify them. Your files are purged from the server within 120 days of payment date. As we cannot physically verify your identity when you place an order, this is the only way for us to accomplish this so we ask that you complete the verification as we won't be able to process your order until this step is completed.

We know you have many choices of where to buy from and we truly appreciate you choosing SimplyNAS as your storage supplier.