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TERRAMASTER

TERRAMASTER D6-320 External Hard Drive Enclosure 6-Bay (Diskless)

Based on 123 reviews
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$299.99

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Availability: In Stock.
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Arrives Sunday, Nov 15
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At a glance

Condition
New
Model
D6-320
Dimensions
8.58"L x 5.12"W x 8.9"H
Weight
4.1 kg
Color
black
Hardware Interface
USB 3.2 Gen 2
Hardware Platform
Windows, Mac, Linux
Warranty
2 Years
Works with
Windows, Mac, Linux

Features 5

  • High Speed Data Transmission: The D6-320 hard drive enclosure (a DAS, NOT a NAS) adopts USB 3.2 Gen2 protocol for high-speed data transmission up to 10Gbps. With 6 hard drives installed, the read/write speed can reach up to 1,030MB/s (SATA III HDD 8TB x 6). With one SSD installed, the read speed can reach 510MB/s (SATA III 1TB SSD x 1)
  • Super-Large Storage Capacity: The D6-320 HDD storage enclosure can support up to six 3.5" and 2.5" SATA HDD, as well as 2.5" SATA SSD, with a maximum capacity of 22TB per drive, providing users with up to 132TB (22TB x 6) of storage space. Note that the D6-320 does not support arrays and only works with individual disks
  • Plug and Play Compatibility: The D6-320 das storage is a plug-and-play device that doesn't require drivers to work. It is highly compatible with MAC, Windows, and Linux operating systems. It has a USB Type-C interface and comes with a USB type C-type C cable. The device is compatible with various computer interfaces, including USB 3.0, USB 3.1, USB 3.2, Thunderbolt 3, and Thunderbolt 4
  • Hot Swappable Functionality: The D6-320 USB enclosure supports hot swapping, which allows you to replace the hard disk without having to power off the device. This feature makes data transfer more convenient and efficient

Description

TerraMaster’s focus has been on digital storage products. In line with the evolving technological landscape, TerraMaster has developed a distinctive product line, which includes both direct and network attached storage devices. At present, TerraMaster sells its products in more than 40 countries, which are widely used in education, finance, government, supermarkets, clinics, scientific research, law firms, film production, home, and other fields. High-speed data transfer and massive storage capacity: The D6-320 hard drive enclosure features a USB3.2 Gen2 interface providing a 10Gbps data transmission bandwidth. With the capability to support up to six 3.5" and 2.5" SATA HDD, and 2.5" SATA SSD, it offers a maximum drive capacity of 22TB and a storage space of up to 132TB (22TB x 6). When six hard drives are installed (SATA III HDD 8TB x 6 simultaneously read/write), it delivers an actual read/write speed of up to 1,030MB/s, while a single SSD installation (SATA III 1TB SSD x 1) can reach a read speed of 510MB/s. Please note that the D6-320 does not support the function of array and only supports individual disks. Highly Compatible Interface: The D6-320 USB storage comes with a 1-meter USB Type-C to Type-C cable and is plug-and-play, requiring no drivers. It is compatible with a range of computer interfaces, including USB 3.0/3.1/3.2, Thunderbolt 3/4. Hot Swappable, Intelligent Disk Sleep: The D6-320 HDD storage allows hot swapping for convenient hard disk replacement while powered on. It supports the sleep function to reduce power consumption and extend the hard disk's service life by following the computer OS's sleep mode. Better Heat Dissipation: The D6-320 HDD enclosure features a temperature-controlled fan that adjusts its speed according to the hard disk's temperature for optimal performance. Its internal structure is optimized to increase air pressure, reduce hard disk temperature, and minimize noise and resonance. These features enable the D6-320 to operate quietly even under heavy load. Expansion of NAS Storage Space: The D6-320 DAS storage is compatible with TerraMaster NAS via USB interface with proper adaptation. Users can expand the NAS storage space by creating arrays and storage pools on D6-320 through TerraMaster TOS. Note: this feature requires TerraMaster NAS with TOS 5.1 or later version. Note: Some mini PCs may have weaker USB signal output, which can cause random interruptions during file read/write operations during data transmission. When this occurs, it is recommended to 1) use the rear USB ports of the computer, as they typically provide a more stable signal; 2) test the device on another known-good computer to rule out hardware issues on the original PC; and 3) use a 10Gbps USB-A/USB-C hub or splitter with a short 0.3m–0.5m cable to reduce signal loss. TERRAMASTER D6-320 TERRAMASTER D4-320 TERRAMASTER D5 Hybrid TERRAMASTER D8 Hybrid

Specs 19

Hardware Interface USB 3.2 Gen 2
Brand TERRAMASTER
Color black
Product Dimensions 8.58"L x 5.12"W x 8.9"H
Hardware Platform Windows, Mac, Linux
Hard Disk Form Factor 3.5 inches
Supported Devices Quantity 6
Data Transfer Rate 10 Gbps

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Nov 15

Yes, absolutely! This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

MacOS - this is the one (Windows and Linux also)
Model: D6-320
Not all enclosures play nice with Mac, this one does. Finding Thunderbolt, is rare, but also that has 6 bays & can handle 20TB drives is harder than you would think. This one handles all of that, and does it well. My only issue is that 10gbps is slower transfer than I hoped for, really wanted 80gbps, but TB5 enclosures are very rare. Even TB4 is very rare at this time. I appreciate the build quality, very solid, the box has some heft to it. The drive trays are all metal, slide in HDD, add 4 screws in the bottom to ensure rock solid stablity. The drives use the lever/latch method, which I prefer, really adds a solid feel and connection, which gives you easy access, and a solid lock down. Power supply meets the needs. The cooling fans keeps things cool, but run quiet. This box is compatible with macOS, Windows and Linux - options abound. ... show more
Reviewed in the United States on March 9, 2026 by Bronz_Mdl
Plug-n-play. Easy to use. Packaging however not spot on.
Model: D6-320
From the moment the TERRAMASTER D6-320 External Hard Drive Enclosure arrived, it promised simplicity and efficiency. Designed to partner seamlessly with large-format hard drives, it sparked excitement for what was to come. However, tech's unpredictable nature soon unveiled itself – a USB connection issue surfaced, casting a shadow of doubt. Was it the enclosure or something else? The plot thickened when the hard drive, purchased separately, was discovered dead on arrival (DOA). Here, Terramaster shone brightly, their customer support stepping in like the heroes of our story. They facilitated a swift return and replacement through Amazon, showcasing their commitment to customer satisfaction. Yet, the twist in our tale – the same USB mystery reappeared. Despite this, the enclosure soldiered on, functioning as intended, a testament to its resilience and quality. The only hiccup? A missing protective sleeve in the second shipment, a minor blip that required a dash of creativity to solve. In the end, the TERRAMASTER D6-320 External Hard Drive Enclosure stands as a beacon of reliability, backed by stellar customer support. While the journey had its ups and downs, the product delivered on its promise, albeit with a gentle reminder: in the world of tech, sometimes, you have to expect the unexpected (and maybe improvise a little). Pros: Reliable performance Exceptional customer support Cons: Potential USB connection mystery Packaging inconsistencies Final Verdict: A great product with a few quirks, the TERRAMASTER D6-320 is for those who value reliability and are ready to tackle minor challenges head-on. It’s not just about the destination but the journey – and this journey, with its mix of trials, tech, and terrific support, is well worth it. ... show more
Reviewed in the United States on March 25, 2024 by Alexander D. Dragu
Supports 6 x 26TB HDD's
Model: D6-320
In an effort to consolidate my external HDD management, I finally opted to purchase a proper HDD enclosure. I have a NAS for other uses, but I needed something that was a DAS (Data Attached Storage) for different drives that I would be rotating or didn't need on a network. This enclosure suited my needs. USB-C connectivity to my PC. 6 drive bays. Independent power and connectivity; that part is key. With the other 4-bay style top-loading HDD bays, if you pull one drive, the entire unit disconnects all the drives and you have to wait for Windows to detect what is in the other bays. With this particular enclosure, you can disconnect the drive in Windows, and the other drives remain powered and accessible. That's true hot swappablility. It's also going to let you transfer files as fast as the drives you have in there will let them. I should have gotten this sooner. Can't recommend it enough. ... show more
Reviewed in the United States on April 6, 2026 by Raymond Terry
Nice DAS. Performs well. Attractively priced.
Model: D6-320
Review Image by cyburbanyte
Review Image by cyburbanyte
Bought in July 2024. Still working very well. Great price for a 6 bay DAS. I'm using with Win 11 Storage spaces. Two of the drives are set up in a RAID 1 config. The others are in a single drive config. Performance is very reasonable over USB 4. However don't expect super speed. If you REALLY need high performance use an internal SSD directly connected to the motherboard. I just need plain vanilla storage in a large volume with RAID configuration options and this serves me very well. To date, the drive configs have been stable with no issues. See enclosed benchmarks. I'm driving the Terramaster D6-320 with a Geekom A7 mini PC. I've moved from a tower case with a 750W power supply to the Geekom A7 and the Terramaster D6320 and I'm VERY happy. This config runs at a fraction of the power draw of my tower and is MUCH quieter. ... show more
Reviewed in the United States on December 20, 2025 by cyburbanyte
Perfect for my use cases.
Model: D6-320
Got a USB4 3 foot cable connected via 10gbps to my PC. Inside I have Three 16tb drives, two Seagate and one Toshiba, and one Seagate 8tb. All drives get their max capable speed without any issues. Must faster than my previous setup where drives would top out at dismal speeds. On the flip side, I got one for my father and his lessor quality USB-C cable wouldn't work correctly. I ended up splurging for him to get a USB-4 cable that was optical. where it changes the data from electrical to optical and back again. That solved his issue considering his distance issues and not being capable of putting the drives right next to his PC like I did.... absolutely use a high quality cable or you will get data corruption issues. Also make sure your drives are in good health! So far I haven't had any issues with compatibility, again 16tb and 8tb no sweat and 2 different brands. Its just a great product. I can't wait to see full on USB-4 based versions in the future for even more faster speeds! ... show more
Reviewed in the United States on February 19, 2026 by namco
D6-320 is good
Model: D6-320
Amazon groups items together for reviews that are not the same. The AI summary of reviews is nonsense. This is the D6-320, (6-bay, non RAID) and it does exactly what it says it does. Offers direct UAS access to all disks, full SMART data. I replicated a ZFS pool to a 4x10TB disk raidz1 in this unit, and it worked at full speed for 7 hours. Disks stayed relatively cool. Just plugged it in and started using it. Build quality is better than most other DAS. None of the JMicron-controller garbage in this one. Don't get the hardware RAID version. ... show more
Reviewed in the United States on April 12, 2025 by B. P.
Works not quite as I hoped and despite irrelevant reviews
Model: D6-320
First of all, the reviews are conflating many different devices. The devices reviewed have notably different firmware and are designed and built differently. So the overall review is not really relevant. You'll have to wade though all reviews to find the ones applicable to the product you're considering. I'm just updating my review. I have been fighting for a few months to get it to work right. Thing is, no mater what, if you happen to transfer big files, or try simultaneous transfers, it will just fail to work properly and the USB control will be reset. The reset takes some time, so forget about any kind of throughput. The kernel messages seem to indicate errors in the processing of NCQ. Trying to disable it or limiting the queue depth is not allowed. I guess the firmware doesn't implement correctly those features. Another update. I have been writing firmware for devices for years. I would be embarrassed and ashamed to unleash a product that poorly done. It is missing key features that would make the product easy and reliable to use. For example, you don't seem to be able to get each disk unique identifier, the WNN. I could go further, but at that point you figured that the device is only half baked. Sure, it will work with a basic workflow and LOTS of hand holding. The heat is not extravagant, but substantial. Al in all a device where they cut so many corners to lower the price, that it is missing its usage target. I would NOT recommend it as a D.A.S.. Or anything else for that matter. ... show more
Reviewed in the United States on June 22, 2025 by Frasc
This would have been a 5 star product until you realize the heat issues
Model: D6-320
I love the layout, the build quality, the accessories, and the basic performance. Here is the real-world issue: I have this unit in a well-ventilated area, and Ironwolf Pro hard drives easily overheat in it. This is not under a full load. This occurs when writing to a single drive with the others mostly at idle. The fans are not user-adjustable in any way. I even added strong fans pointing into the rear to assist. It helps but does not solve the issue. Too bad as I had planned to purchase a few more for my home IT use ... show more
Reviewed in the United States on October 25, 2024 by J. Marvel
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