The TerraMaster D4-320U is a compact and powerful 4-bay direct-attached storage enclosure with a massive 88 TB storage capacity, high-speed data transfer, and expandable NAS integration, making it the perfect solution for small offices, home users, and IT environments.
- Compact design for seamless deployment
- Massive 88 TB storage capacity
- High-speed data transfer at 10 Gbps
Introducing the TerraMaster D4-320U: Compact Powerhouse for Your Data Needs
If you’re on the hunt for a reliable storage solution that doesn’t hog all your desk space, look no further than the latest offering from TerraMaster: the D4-320U. This nifty little device is a 1U 4-bay direct-attached storage (DAS) enclosure, and it’s designed with small offices, home users, and IT environments in mind. With its sleek, space-saving rackmount design, a jaw-dropping 88 TB storage capacity, and lightning-fast 10 Gbps connectivity, the D4-320U is here to tackle modern data demands like a champ.
Compact Design for Seamless Deployment
Let’s talk about convenience. The D4-320U is a game-changer with its miniaturized 1U rackmount form factor. At just 241 mm (9.49 inches) deep, it’s 50% shorter than your typical chassis, making it a breeze to fit into standard server racks without needing extra rails. Weighing in at a mere 3.2 kg, this sleek enclosure is all about maximizing space—perfect for data centers, storage closets, or even tucked away in a corner of your office. Small businesses and SOHO users, rejoice! Centralized storage has never been this easy.
Massive 88 TB Storage Capacity
Now, let’s get to the good stuff: storage. The D4-320U supports up to four drives, giving you a staggering maximum capacity of 88 TB when using 22 TB drives (with even larger capacities on the horizon). By default, it operates in single-disk mode, but don’t worry—if you want to get fancy, you can use third-party software RAID tools to create arrays. Whether you’re managing a sprawling media library or handling enterprise backups, this device has you covered.
High-Speed Data Transfer at 10 Gbps
Speed demons, rejoice! The D4-320U is equipped with the USB 3.2 Gen 2 protocol, delivering a blistering 10 Gbps bandwidth. Pair it with four 8 TB WD Red HDDs, and you can achieve read/write speeds of up to 1,016 MB/s. Even if you’re just using a single 1 TB WD Red SSD, you can still enjoy read speeds of 510 MB/s. This kind of performance is perfect for anyone who needs rapid data access and transfer—think professionals and tech enthusiasts alike.
Expandable NAS Integration
If you’re already using a TerraMaster NAS device running TOS 5.1 or higher, you’re in for a treat. The D4-320U connects via USB to expand your storage pools and create arrays through the robust TOS system. This integration makes it a powerful companion for those looking to scale their NAS capacity effortlessly. Why limit yourself when you can expand?
Plug-and-Play Simplicity
Who doesn’t love simplicity? The D4-320U offers true driver-free, plug-and-play functionality. It seamlessly supports macOS, Windows, Linux, Ubuntu, TrueNAS, Unraid, and more. Plus, with included 0.8 m USB A-to-C and C-to-C cables, you can connect to PCs, TVs, servers, and set-top boxes without a hitch. It’s compatible with USB 3.0, 3.1, 3.2, Thunderbolt 3, and Thunderbolt 4 interfaces, ensuring stable, high-speed connectivity.
Robust Safety and Efficiency Features
Safety first! The D4-320U comes packed with advanced safeguards to prevent damage from mismatched power inputs, ensuring your hardware lasts. Plus, its smart memory feature allows the device to resume its previous state after power outages—ideal for unattended server or NAS setups. With intelligent hibernation, drives enter sleep mode with the host system, reducing wear and energy usage while extending lifespan. And let’s not forget the quiet cooling system; a smart, temperature-controlled low-noise fan keeps things cool and quiet, even under full load.
Automated Backups Made Easy
Backing up your data just got a whole lot easier. With TerraMaster’s TPC Backupper for Windows (8/8.1/10/11), you can schedule incremental or differential backups of folders and partitions to the D4-320U or a TerraMaster NAS. Talk about peace of mind!
More TerraMaster Storage Devices
Alongside the D4-320U, TerraMaster also launched the D5-310, a 5-bay RAID storage device, creating a “enterprise + personal” dual product line. You can snag these new products through the TerraMaster Official Mall and authorized channels, complete with a 2-year warranty service.
Interested in leveling up your storage game? Check out the D4-320U and see how it can transform your data management. For more details, visit: www.terra-master.com/global/products/homesoho-das/d4-320u.html.

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Background Information
About TerraMaster:
Founded in 2010 in Shenzhen, China, TerraMaster has carved its niche in the data storage market as a provider of high-performance solutions. Initially focused on network-attached storage (NAS) devices, they've expanded their products to include direct-attached storage (DAS), RAID storage, and more. TerraMaster offers a diverse range of products catering to personal, home office, and professional needs. They're known for their user-friendly interfaces, powerful performance, and competitive pricing, making them a popular choice for both tech-savvy users and those new to data storage solutions. Their commitment to innovation and customer satisfaction has helped them gain traction in the market, solidifying their position as a rising star in the world of data storage.Latest Articles about TerraMaster
Technology Explained
NAS: Network Attached Storage (NAS) is a specialized storage device or server that provides centralized data storage and access over a network, usually using Ethernet connections. NAS systems are designed to offer a convenient and efficient way to store and share files among multiple users or devices within a home or office environment. Unlike traditional storage solutions, NAS devices operate independently and have their own operating systems and management interfaces. They are characterized by easy setup and configuration, making them accessible even to users with limited technical expertise. NAS devices can offer various features, including data redundancy through RAID configurations, remote access over the internet, automatic backup, media streaming, and even application hosting in some advanced models. As a versatile and user-friendly storage solution, NAS has become a popular choice for both personal and small business use.
Latest Articles about NAS
RAID: RAID (Redundant Array of Independent Disks) is a technology used in the computer industry to increase the performance, reliability, and storage capacity of computer systems. It works by combining multiple hard drives into a single logical unit, allowing them to be accessed as if they were a single drive. This allows for faster data access, as multiple drives can be accessed simultaneously, and for increased reliability, as data can be stored redundantly across multiple drives. RAID is commonly used in servers, workstations, and other high-performance computing systems, as well as in consumer-level storage solutions such as NAS (Network Attached Storage) devices.
Latest Articles about RAID
SSD: A Solid State Drive (SSD) is a modern data storage device that employs flash memory technology to store data electronically. Unlike traditional hard disk drives (HDDs), SSDs have no moving parts, resulting in significantly faster read and write speeds. This leads to quicker boot times, faster application loading, and smoother overall system performance. SSDs are known for their durability, shock resistance, and energy efficiency, making them ideal for laptops, ultrabooks, and other portable devices. They come in various form factors, including 2.5-inch, M.2, and PCIe cards, and are favored for their reliability, quiet operation, and reduced heat generation
Latest Articles about SSD
Thunderbolt 4: Thunderbolt 4 is a high-speed connection interface that enables data transfer between computers and peripherals. Thunderbolt 4 is the fastest version of Thunderbolt yet, with speeds up to 40 Gbps, and it is also the most versatile, with support for up to four 4K displays, dual 4K video, and up to 100W of power delivery. Thunderbolt 4 is ideal for connecting high-performance peripherals such as external storage drives, docks, and displays. It is also ideal for connecting multiple computers together for high-speed data transfer and collaboration.
Latest Articles about Thunderbolt 4
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