TERRAMASTER D4-320 External Hard Drive Enclosure - 4bay USB 3.2 Gen2 10Gbps Type-C USB Storage Hot Swappable Plug and Play (Diskless)
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Availability:
In Stock.
Arrives
Tuesday, Jul 7
Model: D4-320
Features
- High-Speed Data Transmission: The D4-320 hard drive enclosure (a DAS, NOT a NAS) utilizes the USB 3.2 Gen2 protocol, achieving high-speed data transmission of up to 10Gbps. When equipped with four hard drives, the actual read/write speed can reach up to 1,016 MB/s (combined read/write with four SATA III HDDs of 8TB each). With just one SSD installed, the read speed effortlessly reaches 510 MB/s (SATA III 1TB SSD). The D4-320 supports a single HDD up to 30TB, with a total capacity of 120TB, and is compatible with various hard drives, including 3.5-inch SATA hard drives, 2.5-inch SATA hard drives, and 2.5-inch SATA SSDs.
- Plug-and-Play Compatibility: The D4-320 USB storage supports 4 individual disks (NO RAID function), and is plug-and-play, eliminating the need for drivers. It is highly compatible with MAC, Windows, and Linux operating systems. The USB Type-C interface supports various computer interfaces, including USB 3.0, USB 3.1, USB 3.2, Thunderbolt 3, and Thunderbolt 4.
- Hot Swappable Convenience: The D4-320 HDD enclosure supports hot swapping, allowing users to replace hard disks without powering off the device. This feature enhances convenience and efficiency in data transfer processes.
- Tool-Free Hard Drive Management: Featuring a tool-free hard drive tray design, the D4-320 external HDD enclosure enables easy installation and removal of hard drives without requiring additional tools. Furthermore, the D4-320 incorporates TerraMaster's unique Push-lock design, automatically securing the hard drive tray upon insertion, preventing the hard drive from falling out or disconnecting.
- Efficient Heat Dissipation and Quieter Operation: The D4-320 direct attached storage incorporates an intelligent temperature-controlled fan for optimal heat dissipation. Additionally, specialized sound-absorbing panels and vibration damping measures contribute to a quieter operation, with noise levels reduced by up to 50% compared to the previous generation. In standby mode, the noise level drops below 21 dB(A), creating a remarkably quiet user environment.
Hardware Interface: SATA 6.0 Gb/s, USB 3.2 Gen 2
Brand: TERRAMASTER
Color: Black
Product Dimensions: 8.74"L x 7.05"W x 6.06"H
Hardware Platform: Windows, Mac, Linux
Hardware Interface: SATA 6.0 Gb/s, USB 3.2 Gen 2
Hardware Platform: Windows, Mac, Linux
Compatible Devices: Windows, Mac, Linux
Hard Disk Form Factor: 3.5 Inches
Supported Devices Quantity: 4
Data Transfer Rate: 10 Gigabits Per Second
Connectivity Technology: USB
Color: Black
Enclosure Material: Plastic
Item Dimensions L x W x H: 8.74"L x 7.05"W x 6.06"H
Item Weight: 1.3 Pounds
Brand: TERRAMASTER
Global Trade Identification Number: 90
Manufacturer: TERRAMASTER
Mfr Part Number: D4-320
Model Number: D4-320
Warranty Description: 2 Years
Built-In Media: Power Adapter, Quick Installation Guide, USB Cable
Unit Count: 4.0 Count
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Jul 7
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Model: D4-320
The self-noise is very quiet although there isn’t much dampening for hard drive noise so the actual drives may be very audible. The fans work great and keep my drives consistently below 40C. The case feels a bit cheap because of all the plastic but I kind of prefer this since it’s so light weight. Despite the plastic case, it feels really solid. The case should hold up for years. The lights on the front are really helpful to confirm disk activity. I only have two complaints: how the drives show up in windows and the quality of the USB-C connector. Each drive shows up individually which is great for software RAID, but ejecting the drives means each one has to be removed from windows separately. I wish there was a way to eject them all as one device before I disconnect the enclosure. The USB-C connector also could be stronger. If something accidentally bumps into the cable while it’s in, it can disconnect from the host even if the cable looks like it should still be connected. Despite these concerns, I’m very happy with this enclosure.
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Reviewed in the United States on April 3, 2026 by Zack S
Model: D4-320
I have been running the TerraMaster D4-320 for a year and a half now, and it has performed flawlessly. My setup consists of four 22TB Western Digital Ultrastar DC HC570 enterprise drives configured in a software RAID10 array on a Linux NAS. It has been so reliable and stable that I just ordered the 2-bay version, the D2-320, to expand my storage even further. However, looking at the negative reviews complaining about random drive disconnects, frozen transfers, and data corruption, I am confident that a huge percentage of these bad experiences come down to one single, easily avoided issue: the factory USB cable included in the box. These 320-series enclosures operate on a high-speed 10 Gbps (USB 3.2 Gen 2) interface. When you are multiplexing data from up to four separate hard drives down a single USB line, the connection is incredibly sensitive to signal degradation. The stock 1-meter cable included with the unit is simply too thin and too long for this specific high-bandwidth hardware specification. Under heavy or sustained write loads, the signal degrades over that distance, causing the data packets to drop. The host operating system loses track of the connection, panics, and resets the drive link - which looks to the user like a random disconnect or a corrupted array. The Fix is Simple: Do not use the factory cable. Instead, replace it immediately with a short, thick, heavily shielded USB cable rated explicitly for 10 Gbps or USB 3.2 Gen 2. I personally use a high-quality 0.5-meter (1.6 feet) heavily shielded cable (the kind typically bundled with external NVMe SSD enclosures). Keeping the cable short and thick does two vital things: 1. Eliminates Signal Loss: Shorter distances mean the high-frequency data signals arrive clean and error-free without the enclosure needing to constantly re-transmit corrupted data. 2. Reduces Electrical Resistance: Thicker copper wires ensure that when the enclosure spikes in power usage during heavy metadata operations, the voltage remains completely stable across the connection. If you treat the stock cable as temporary packaging and swap it out for a heavy-duty, short 0.5m cable from day one, this enclosure is an absolute tank. Highly recommended, just budget an extra ten dollars for a proper data cable!
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Reviewed in the United States on May 29, 2026 by Kevin
Model: D4-320
Update 3/26/2026 Sorry for the false alarm below. The issue was with the power supply, not with the device. The power supply had the same brand name and appeared virtually identical, so I just plugged the new one into the same power supply, but then out of abundance of caution I glanced at the fine print on the old power supply and realized it says 72 watts (W) of output, and then I glanced at the new one, but it said 120 W of output. A huge difference, clearly. After carefully untangling the cables needed to take out the old power supply from my double-layered set of Bluetti and CyberPower battery backups, and put in the new power supply, the 6-bay model does work flawlessly, and has enough power to spin up all four drives at once. Just a note of caution, since 72 W of power is NOT enough for four drives, this means each drive probably needs at least 20 W apiece to spin up (for Exos enterprise drives). Thus, six drives would likely need at least 120 W total, meaning that the new power supply may or may not be enough power to actually spin of six drives. When I do ever sometime install six drives at once, I might run into the same issue of not having enough power to spin all the bays up that the machine is rated for, just like I experienced with the 4-bay version not having enough power to spin up all of its bays. But for now, when I am only using my four drives in this 6-bay unit, and with its correct PSU included in the box, rather than the prior one, it does have enough power to spin up the four drives with two of the bays empty. It's kind of an extreme cost cutting measure that the PSU included saves like 15 cents of cost by only putting out 72 W for one model and only 120 W for another model, but I respect the right of a company to just include the bare minimum to make its product work. Although the prior 4-bay model did NOT work with 4 drives loaded in it, and it still awaits to be seen whether the 6-bay model will work with a full load of 6 drives in it as well. Other than this power issue, this unit has worked flawlessly and perfectly for over a year on my MacBook Pro M4 Max, and hopefully it will keep doing the same on my new MacBook Pro M5 Max. Update 3/26/2026 For the past year, I have been stuck with hot swapping the 4th drive after powering up this model just so that it can boot, as it powers off from a voltage deficiency over and over in an infinite loop when 4 drives are loaded. So today, in the spring sale, my package arrived with the new 6-bay version. Obviously, with 6 bays, it should have more voltage to be able to spin up just by 4 existing drives, right? Wrong. I am attaching a video showing the infinite loop STILL happening of trying to spin up just four drives, then failing, which happens on the 6-bay model, just the same as on the 4-bay model. DO NOT BUY THIS PRODUCT. IT CANNOT LOAD MORE THAN 3 PHYSICAL HARD DRIVES AT A TIME, EVEN THOUGH IT CLAIMS TO SUPPORT SIX. The package has been opened and all the screws taken out, but hopefully I can still do a return and go back to my 4-bay model, and keep on living with this terrible situation of loading in the 4th drive after waiting for the first 3 to spin up. I live in daily terror that at some point my timing will be off, and my computer will see the missing drive as a corrupted software RAID array, instead of getting the timing just right so that my computer thinks there is just a small delay in loading up the fourth drive from the enclosure, instead of seeing it as a missing drive/corrupted RAID. Original Update: when used with 4 seagate 28 TB drives, it cannot spin up because inadequate voltage. One drive has to be slid out partway when turning on, then slid back in after the first 3 spinup. Otherwise, still works great. Only this drive so far can't spin up with 4 drives inside. Other drives don't need so much voltage, apparently. -- I generate over 20 TB of media a year as a photographer, and I now use software raid only after way too many unrecoverable hardware raid failures. And I also use backups on additional DAS devices, never trusting just raid alone for safety. But I have always been frustrated that good enclosures are close to $300 or even $1000, just to provide a decent 1000 MB/sec of combined speed from multiple drives. Lots of DAS devices are available, but until this one, it was always close to $300 or far more just to get true drive speed like 250 MB/sec for one drive times four = 1000 MB/sec total. Why should I pay the price of an entire new PC just to provide a SATA connection and power cable to my drives that doesn't bottleneck my speed when accessing more than one drive at once with RAID? Finally this one is available for half the cost, and it really works. I've bought four and will buy more.
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Reviewed in the United States on August 30, 2024 by Joseph
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.
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Reviewed in the United States on June 22, 2025 by Frasc
Model: D2-320
D2-320 arrived and looked good. solid construction high quality cables, parts fit well together. Installation is intuitive. So simple, in fact, I had it installed with 2 SSDs, THEN looked at the installation instructions. Transfer speeds are pretty good. USB 3.2 is a speedy boy, even with both drives hammering large (700G) transfers at the same tiime. Now, the issues. It has an EXTREMELY small supported product list. Trust me if your device isnt on the compatiibility list, its probably not going to work well. Support, while available pretty much 24 x 7, are extremely slow to respond in live chat...and in fact one of them went for an hour meeting while in chat with me without saying so. Support attitude is poor, at best. In regards to knowledge, they didnt tell me anything of value other than obvious things like "change what bays the drive is in"... well duh...rocket science. They even said that "Sharing" a drive via standard windows file sharing required a NAS rather than a DAS. sorry...wrong... Despite their fumbling support and extremely restrictive compatibiility list, I AM still using the product, and its functioning pretty much as good as it looks (which is pretty boring, but thats a good thing with computer hardware. boring means its working). I managed to sort out the issues myself, which werent really attributable directly to the product other than it not supporting faster, newer SSDs, and very few of the older generation drives. Would I recommend it? Probably not. Spend a little more. Update - New Samsung 870 EVO 1Tb drives arrives. Inserted into the DAS which proceeded to not see them. Windows Disk Manager did, however see them both and proceeded with addiing them and letting me format them. The DAS automatically detected the drives once they were partitioned and formatted. Setup Windows shares and they work perfectly across the network to another Win 11 machine and a Win 10 machine. Care must be taken on shares if you are hot swapping disks since it seems to be the slot in the DAS uniit that gets the share name and permissions rather than the actual disk. This is NOT the fault of the D2-320 but a windows thiing. Rating increased from 2 to 4 stars.
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Reviewed in the United States on January 14, 2025 by roger b.
Model: D4-320
We are so very very happy with our TERRAMASTER D4-320 External Hard Drive Enclosure. This enclosure allowed us to put some of our older drivers on our server, something that wasn't easy with the limited number of bays in the older case. It had all the functionality we were hoping for, we had no issue with compatibility, making it a major plus, especially when we are constantly moving drives between machines (my husband is constantly playing and experimenting with a variety of servers, some being our personal household servers and others being his test machines for testing out hardware/new software). The instructions were pretty self-explanatory, and we had no issues with overall connectivity. It also had the power to do everything we wanted. He also loved that he was able to test drive in this bay, finding out what we had on some of our older drivers who were just waiting for testing. I also loved that protection it has, allowing me to breathe easy that our drives are protected from drops, but just as important, keeping everything we need in one place that we may possibly need to work on my in-laws' computers (as well as doing emergency backups since parents seem to always do the most interesting things to computers). Overall, I don't think we could be happier. There are reasons my husband and I both trust TERRAMASTER.
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Reviewed in the United States on May 18, 2026 Reviewed in the United States on May 18, 2026 by Susan Bewley
Model: D4-320
I upgraded my computer and went with a smaller case that couldn't accomodate all of my drives so I went looking for a DAS (didn't want a NAS because my network is only 1gbit and didn't want to be limited to those speeds). This was exactly what I was looking for. I have 3 Samsung 870 Evo SSD's as well as a Seagate EXOS 24TB hard drive in this and they all work as if they were plugged directly into the motherboard. I didn't use any extra software or do any type of RAID or anything so I can't comment on anything other than just plugging drives in and using them as all individual drives. Due to my placement of this DAS I had to buy a separate 10ft USB C cable which gave me the same exact speeds as the included cable (if you go this route just double check that you're getting the correct cable), that's also the same speeds I was getting when they were plugged in via SATA. I originally thought I was going to need some kind of 2.5" to 3.5" adapter to be able to use the SSD's but then I noticed the sleds in this have screw holes to be able to screw in 2.5" drives and it has screws included so nothing extra was needed. The sleds have these plastic pieces on each side (I think they're used for holding the 3.5" drives but I didn't pay enough attention), which needed to be removed to be able to screw in the 2.5" drives. Overall installation was extremely simple and I think anyone who knows that they need something like this can probably figure out how to put the drives in (I don't recall seeing any kind of visual instructions but I also didn't look very hard). You put the drive in the sled, and then slide it in. It's that simple. And the overall build quality is totally fine. Nothing crazy but it's nice and firm plastic, perfectly acceptible and what I was expecting. The DAS itself is quiet, but the sound of my hard drive reading/writing is a lot more noticable in this than it was when I had it in my old PC case which I found odd since the old case was a lot closer to me than this DAS is. This isn't really that big of a deal to me but could be for other people. The fan is so quiet that even if I put my ear right up next to it I can't hear it over the ambient noise in my house. Not sure what else I can say as I've only had it for a day now and it's done exactly what I needed it to do. If something bad happens I'll update this review, but as of now it's perfect.
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Reviewed in the United States on March 21, 2026 by Zatch
Model: D2-320
I purchased the D2-320 2-bay RAID enclosure with USB 3.2 Gen 2 10 Gbps My purpose with this unit was to mirror (RAID1) two 6TB WD Reds with a Linux machine. I’m not familiar with this brand, so I decided to test it a little before copying a lot of my files over to the D2-320. Getting everything working was pretty easy. I pulled out each bay, installing the drive was pretty easy, no screws needed. They provide a video on it if you’re unsure. I set the selector on the back of the unit to RAID1, shoved in both drives, connected the USB (drives are powered but won’t spin up until the USB is connected), then held the RESET button with the provided pin until the disk lights flashed. The system found one drive - as it should have. I wrote approximately 18K files and directories of various sizes to the array and then without disconnecting the USB or turning off the power, I pulled out one drive. I then connect the pulled drive directly to another computer to see that the files were in fact written to the drive. They were. All good to go. I replaced the drive. Both lights are green. Since no changes had been made to either drive, this is perfect, it didn’t try to rebuilt the array Next, I pulled the second drive out hot. Then connected that drive to the other computer and checked to make sure all files were also written to this drive as well. They were! It is working as it should be. I then created a couple files on the other drive and then replaced the pulled drive back into the D2-320. One drive light was blinking green, the other blinking yellow. According to the online documentation, this means it is rebuilding the RAID1 mirror. Perfect .. Everything is performing as expected. It did take a few hours to rebuild .. but these are 6TB drives, so that was expected. The USB cable provided seems adequate, USB C on both ends. If you need a different cable, consider that when purchasing. Average 1G file write 156 MB/s, average 1G read 221MB/s. Slow but these are mechanical drives connected via USB. Acceptable. Later, I watched a video using Jellyfin and reading, transcoding, and streaming worked perfectly fine. The large fan is quiet and seems to keep the drives cool. Airflow looks to be sufficient. How noisy the unit will be will depend on your drives. Some are louder than others. These drives will be part of a system I have in place which will be up and running 24/7. I’ll be very interested in seeing how well the Terramaster D2-320 performs in the long run. I’ll post updates after I have used them for some time.
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Reviewed in the United States on December 2, 2024 Reviewed in the United States on December 2, 2024 by Robert N.