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TERRAMASTER

TERRAMASTER D4-320 External Hard Drive Enclosure 4-Bay (Diskless)

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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

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. New Upgrade, Refreshed Experience: As an upgrade to the classic D4-300, the D4-320 hard drive enclosure offers several revolutionary changes while maintaining affordability. Its new design concept offers a stylish and minimalist appearance that is more aesthetically pleasing, while its underlying technology offers a qualitative leap in terms of performance, allowing users to access outstanding functionality. Enhanced Speed and Performance: Utilizing USB 3.2 Gen2 protocol, the D4-320 USB storage achieves lightning-fast data transfer speeds of up to 10 Gbps, doubling the speed of its predecessor (D4-300). Whether handling multiple hard drives concurrently or a single drive, the D4-320 consistently delivers exceptional performance, reaching read/write speeds of up to 1,016 MB/s (combined read/write with SATA III HDDs x 4). Even with just one SSD installed, the read speed effortlessly reaches 510 MB/s (SATA III 1TB SSD). Thus, whether using multiple hard drives operating in parallel or ensuring the efficient operation of a single hard drive, the D4-320 demonstrates exceptional performance. Flexible and Compatible Connectivity: The D4-320 direct attached storage boasts strong interface compatibility with its USB Type-C interface, providing seamless connections to various computer interfaces, including USB 3.0, USB 3.1, USB 3.2, Thunderbolt 3, and Thunderbolt 4. Its hot-swappable support and driverless, plug-and-play functionality make it a versatile and user-friendly storage solution, compatible with different operating systems and devices. Convenient and Efficient Hard Drive Management: The D4-320 HDD enclosure introduces a revolutionary tool-free hard drive bracket with a Push-lock design, allowing quick and secure installation without the need for tools. This innovative design ensures stable data transmission, greatly enhancing the efficiency of hard drive replacement. Swapping hard drives becomes a seamless process, providing added convenience for users who frequently switch drives. Additionally, the D4-320 is exceptionally quiet during its operation, thanks to its specialized sound-absorbing panels and vibration damping, which reduce noise levels by up to 50% compared to the previous generation, dropping below 21 dB(A) in standby mode for a remarkably quiet user environment. Versatile Storage Expansion: With support for up to four hard drives, each with a maximum capacity of 30TB, the D4-320 offers a powerful storage expansion of up to 120TB. Based on careful adaptation and optimization by the professional team at TerraMaster, the D4-320 offers seamless connection to the USB interface of TerraMaster NAS. Leveraging the powerful TOS system developed by TerraMaster, users can easily create arrays and storage pools on the D4-320, effectively expanding the storage space of their NAS to meet growing demands for data. This feature is only applicable to TerraMaster NAS devices running TOS 5.1 or above. Based on this innovative feature, the D4-320 provides users with a more flexible and diverse storage expansion solution. 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 D4-320 TERRAMASTER D6-320 TERRAMASTER D5 Hybrid TERRAMASTER D8 Hybrid

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


Unit Count: 4 Count


Number of Items: 1


Number of Packs: 1


Item Highlight: USB 3.2 Gen2 10Gbps, Type-C USB Storage, Hot Swappable Plug and Play (Diskless)


Manufacturer: TERRAMASTER


Built-In Media: Power Adapter, Quick Installation Guide, USB Cable


Model Number: D4-320


Mfr Part Number: D4-320


Warranty Description: 2 Years


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Sep 21

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.

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Similar Products

Top Amazon Reviews

    • Just what I needed
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. ... show more
Reviewed in the United States on March 21, 2026 by Zatch
    • Fatal Flaw to what could be the solution for photographers
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. ... show more
Reviewed in the United States on August 30, 2024 by Joseph
    • Excellent and worth the extra coins over the competition. Self-hosting game changer for me.
Model: D4-320
Better than others by far. This is about the fourth or fifth one of these enclosure things I've bought and this one is the best by far. Build quality is excellent and made of thick plastic (quieter than aluminum). Stay away from the Mediasonic brand ones if you are using it for a server - I've gifted away two of those because the power button always had to be pressed after power loss and the usb controller was shared by all the drives (it also was weird with device naming). I'm using the TerraMaster with a Raspberry Pi 5 8GB running OMV 8, with one 8TB CMR hdd and two 6TB SMR hdd. It has a USB controller for each disk slot and I was pulling full read write speeds from the disks simultaneously. I also didn't have any disk sleeping issues (after disabling SMART monitoring and using HD-idle instead of OMV's built-in stuff). The power button is last state; it powers back ON after power loss if it was ON before the power loss. I found the trays easy to install my disks into and the latching click is very satisfying. The fan is quiet enough for my application. I used it in Unraid as well for some testing and everything looked fine on that too - including the device naming. I was copying over 400MB/s to it using a btrfs raid0 array of SMR disks over plain old usb 3.0. ... show more
Reviewed in the United States on March 8, 2026 by kompewterz
    • BUYER BEWARE! Mac User - Bricked 3 of my seagate backup plus drives in 2 hrs lost 7 years of data
Model: D4-320
TL;DR - power supply or Mac incompatibility toasted 12tb+ of data I had for ~7 years within 2 hrs. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Like most buyers in 2025, I used AI to help me find the best product for my needs. I had 3 seagate back up plus drives that I wanted to transfer data between and consolidate. Grok AI recommended that I use this terra master DAS as opposed to cheaper alternatives. I was super excited ordered it and it arrived the next day from Amazon. The excitement faded very quick. First, I "shucked" all of my seagate drives, a 3x 5tb's and a 8tb drive all formatted as individual disks. I put all my drives inside the system and powered it on connecting it to my Mac with Sequoia 15.7.1 As soon as the system powered up I was hit with error messages. 2 of my drives which were formatted with exfat were showing as "unreadable" and required formatting. I thought this was very odd, but reconciled that maybe since these drives hadn't been used in a year something had happened. The other 2 drives which were formatted HFS+ still showed up and were accessible. I started transferring data between the working drives and reformatted the other 2. In the middle of transferring data my Mac got super hot and decided to go to sleep or restart. When my Mac woke up and reconnected to the drives, now the last remaining drive with 6.5/8tb full was now corrupted. I tried checking the disk in disk utility using first aid and got serious errors. I took the drive out of this enclosure and put it in the original enclosure and am still trying to recover the data with basically no success. I did find a setting in my Mac "put hard drives to sleep when possible" I am not sure if this had anything to did with with it. Maybe my Mac put the drive to sleep and that caused the problem. I think the power supply on the terra master had some kind of power spike when all the drives spun up / spun down at once and it blew the drive. Overall, I am extremely disappointed. I got this system to help save my data and instead lost basically all the data I had been collecting for 7+ years in a matter of hours. ... show more
Reviewed in the United States on November 8, 2025 by Technology Enthusiast
    • Great 4-disk enclosure
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. ... show more
Reviewed in the United States on April 3, 2026 by Zack S
    • The TERRAMASTER D4320: An Excellent USB-C Storage Solution, But Setup Can Be Challengeing
Model: D4-320
I purchased the Terramaster D4-320 4 Bay External Hard Drive Enclosure because I wanted to create a backup shared drive with a few hard drives I had laying around. What attracted me to this the D4-320 was the price and the capability to group the hard drives into 1 large share drive. I'm dinging 1 star as the documentation to create the combined drive was lacking and you have to go to their website (via QR code) to get directions on how to set it up. The instructions didn't really work for me, but I was able to google the right way to do this through Storage Spaces in the Windows System Storage Settings. Once I got it setup, the machine has been flawless so far. Since it is USB-C, data transfers to this drive are fast. I'm getting my full network transfer speeds, which is great, because I was backup up mutliple terrabytes of space.. The other thing I really like about the D4-320 is that is pretty quiet. This HD enclosure sits on my desk and I was afraid it would be buzzy or loud in some other way. While this is not a silent machine, it is not very noisy either, and I've found that I barely notice it is here. I've only owned it for a week, so time will tell on the reliability, but for now I am pretty pleased with the TERRAMASTER D4-32O ... show more
Reviewed in the United States on October 13, 2025 by John MacMullen
    • It’s overall okay
Model: D4-320
Review Image by Xinyue Zhao
It’s kinda loud if you don’t put all 4 hdd in, because of the material and the hollowness inside, the vibration and hdd random searching sound will be loud. But it’s very easy to use, pretty straightforward, once placed it, no need to worry about it anymore. It has fan to cool everything down, and capable of handling more than 105tb. ... show more
Reviewed in the United States on August 10, 2026 by Xinyue Zhao
    • Excellent 4 Drive Enclosure
Model: D4-320
For years I used OWC Mercury Elite Quad Pro enclosures with SoftRaid. One unit was replaced under warranty about a year ago. A second unit just died a year out of warranty. I contacted OWC for support, hoping it was an easily fixable issue, but it was not. The tech support guy said he felt bad as these units don't typically die in 2-3 years and offered a discount to purchase a replacement. When I clicked on the discount link, the offer was for a 4% discount. FOUR PERCENT! I researched alternatives and came up with this unit. Yes, it is plastic while the OWC unit is steel, but I placed my 4 discs in, powered up and I was back in business for $90 less with all my files intact. This enclosure has tool-less drive mounts that work very well, is fairly quiet and remains cool to the touch. It appears to be very well made. ... show more
Reviewed in the United States on July 18, 2026 by RMunde

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