For a large storage pool, the TerraMaster D6-320 is the clear capacity pick: it holds six SATA drives and lists support for up to 132TB. The D2-320 takes a different route, with room for two drives and RAID modes that can mirror data or combine capacity. I rank the D6-320 first for buyers who need to grow a multi-drive pool, while the D2-320 earns a place as a compact, flexible alternative for smaller setups. The main tradeoff is straightforward: more bays and a metal build on the D6-320, versus RAID choices and easier placement on the D2-320. Neither should be mistaken for a network-attached storage system; both connect over USB, so your host computer remains part of the storage setup.
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Key Takeaways
- The D6-320 is the stronger fit for a growing pool because it supports six SATA drives and lists up to 132TB of total capacity.
- The D2-320 has only two bays, but RAID 1 can mirror drives while JBOD and other listed modes provide different ways to organize them.
- Both enclosures use USB 3.2 Gen 2 with a stated transfer rate of up to 10Gbps; actual throughput also depends on drives, workload, and host connection.
- The D6-320 has a metal enclosure and hot-swap support, while the D2-320 is lighter and offers tool-free drive installation.
- Choose the D6-320 for bay count, not RAID features; choose the D2-320 when two-drive RAID options matter more than expansion.
| TERRAMASTER D6-320 External Hard Drive Enclosure 6-Bay (Diskless) |  | Best Overall for Expanding a Large Pool | Drive bays: 6 SATA drives | Listed maximum capacity: 132TB | Host interface: USB 3.2 Gen 2 | VIEW ON AMAZON | See Our Full Breakdown |
| TERRAMASTER D2-320 USB RAID Enclosure 2-Bay (Diskless) |  | Best for Two-Drive RAID Flexibility | Drive bays: 2 SATA drives | Listed maximum capacity: 44TB | Host interface: USB 3.2 Gen 2 | VIEW ON AMAZON | See Our Full Breakdown |
| jbod enclosure for large storage pool | Drive bays | Listed maximum capacity | Host interface | Stated transfer rate |
|---|---|---|---|---|
| TERRAMASTER D6-320 External Ha | 6 SATA drives | 132TB | USB 3.2 Gen 2 | Up to 10Gbps |
| TERRAMASTER D2-320 USB RAID En | 2 SATA drives | 44TB | USB 3.2 Gen 2 | Up to 10Gbps |
More Details on Our Top Picks
TERRAMASTER D6-320 External Hard Drive Enclosure 6-Bay (Diskless)
The D6-320 is my first pick for a large storage pool because six drive bays change what you can build. Its listed maximum capacity is 132TB across supported SATA drives, giving a single host computer room to manage considerably more storage than the two-bay D2-320. That headroom suits video libraries, archival collections, and other local storage jobs where adding drives matters more than having RAID modes built into the enclosure.
The tradeoff is that the D6-320 is not a RAID enclosure. Its product details state that it does not support RAID configurations, so buyers seeking enclosure-level RAID 1 or RAID 0 should look to the D2-320 instead. The six bays are described as hot-swappable, which can make drive replacement or changes more convenient, though that convenience does not create redundancy or protect files by itself. I would plan a separate backup strategy for important data.
Both TerraMaster models use USB 3.2 Gen 2 and list transfer rates up to 10Gbps, so the D6-320 does not gain a faster stated interface than its smaller sibling. Its advantage is drive capacity, not a higher connection ceiling. The metal enclosure and intelligent cooling system are useful attributes for a multi-drive device that may run for long periods, but its 4.1kg weight and larger footprint make it less suited to a crowded desk. It also needs external power, and the diskless configuration means the buyer supplies every drive.
Compared with the D2-320, I would choose this model when expansion is the main goal and storage management can happen through the connected computer. Skip it if you need built-in RAID modes, a compact two-drive setup, or network access without a host PC. For a USB-attached pool that prioritizes bay count, it is the more purpose-built option of these two.
Pros:- Six SATA bays provide substantially more expansion room than the D2-320.
- Lists support for up to 132TB total capacity.
- Hot-swap support can simplify drive changes.
- Metal enclosure, intelligent cooling, and compatibility with Windows, Mac, and Linux.
Cons:- Does not support RAID configurations, unlike the D2-320.
- Requires external power and takes up more space than the two-bay option.
- Diskless design means drives must be purchased separately.
Best for: Buyers who want up to six SATA drive bays for a large, locally attached storage pool and can manage storage through a Windows, Mac, or Linux host.
Not ideal for: Anyone who needs built-in RAID configurations, a lightweight desktop enclosure, or a standalone network storage device.
- Drive bays:6 SATA drives
- Listed maximum capacity:132TB
- Host interface:USB 3.2 Gen 2
- Stated transfer rate:Up to 10Gbps
- Drive handling:Hot-swappable
- Enclosure material:Metal
- Compatibility:Windows, Mac, and Linux
- Dimensions and weight:8.58 × 5.12 × 8.9 inches; 4.1kg
- Warranty:2 years
Our verdict“Choose the D6-320 when six bays and large-pool capacity matter more than built-in RAID modes or a compact footprint.”
TERRAMASTER D2-320 USB RAID Enclosure 2-Bay (Diskless)
The D2-320 is the more flexible choice for a small pool, not the better enclosure for maximum expansion. It holds two SATA drives and lists capacity up to 44TB, well below the D6-320’s six bays and 132TB. Its distinguishing feature is support for RAID 0, RAID 1, JBOD, and Single mode. That gives buyers options the larger D6-320 does not offer, including mirrored storage through RAID 1.
Those modes make the D2-320 a useful fit for a two-drive desktop archive or a compact storage setup where a particular drive arrangement matters. RAID 1 can keep a copy of data on each drive, but it is not a substitute for a separate backup. RAID 0 can combine drives for a different performance and capacity arrangement, while JBOD and Single mode provide other ways to present or manage storage. Buyers should select a mode based on their needs and understand its consequences before loading important files.
Like the D6-320, this model lists USB 3.2 Gen 2 and up to 10Gbps, so the smaller bay count does not mean a lower stated USB interface rate. The D2-320 adds tool-free installation and intelligent temperature control, and its 1.3kg weight is easier to accommodate than the D6-320’s 4.1kg body. Its plastic enclosure is a tradeoff against the D6-320’s metal construction, and the supplied details do not specify the external power source beyond noting that one is required.
I would put this model ahead of the six-bay option only when RAID choice or two-drive simplicity outweighs pool size. If your aim is to add drives over time or reach a larger capacity, the D6-320 is a more natural match. The D2-320 is diskless, so the drives are a separate purchase, and it remains a USB enclosure rather than a standalone NAS.
Pros:- Supports RAID 0, RAID 1, JBOD, and Single mode.
- Tool-free drive installation and removal.
- USB 3.2 Gen 2 with a stated transfer rate up to 10Gbps.
- Lighter and smaller than the six-bay D6-320.
Cons:- Two bays and a listed 44TB maximum leave much less room to expand than the D6-320.
- Plastic enclosure may feel less robust than the D6-320’s metal body.
- Diskless and requires external power.
Best for: Buyers who want a compact two-drive enclosure with listed RAID 0, RAID 1, JBOD, and Single modes for a desktop storage setup.
Not ideal for: Anyone planning a large multi-drive pool, seeking more than two bays, or preferring a metal enclosure.
- Drive bays:2 SATA drives
- Listed maximum capacity:44TB
- Host interface:USB 3.2 Gen 2
- Stated transfer rate:Up to 10Gbps
- Listed modes:RAID 0, RAID 1, JBOD, and Single
- Drive types:Hard disk drives and SSDs
- Installation:Tool-free
- Enclosure material:Plastic
- Dimensions and weight:8.74 × 4.69 × 6.06 inches; 1.3kg
Our verdict“Pick the D2-320 for two-drive RAID options and a lighter footprint, but not as the first choice for a genuinely large storage pool.”
How We Picked
I ranked these enclosures by how well they serve a buyer building a large storage pool, not by treating every feature as equally valuable. Bay count and stated maximum capacity lead the comparison: six bays give the D6-320 much more room to expand than the D2-320. I also weighed connection speed, drive handling, build material, and whether the product description lists RAID modes. Those factors show the practical split between a higher-capacity USB enclosure and a smaller RAID-capable unit.
I have not assumed that a stated interface speed equals real-world drive performance, or that an enclosure alone provides backup, network sharing, or RAID on the D6-320. The supplied product details identify the D6-320 as having no RAID configurations and the D2-320 as supporting RAID 0, RAID 1, JBOD, and Single mode. I treat those as distinct use cases rather than ranking RAID as automatically better: mirroring can help maintain access after a drive failure, but it does not replace a separate backup. The order reflects the title’s large-pool focus, with a clear alternative for buyers whose storage priorities are different.
| jbod enclosure for large storage pool | Enclosure material |
|---|---|
| TERRAMASTER D6-320 External Ha | Metal |
| TERRAMASTER D2-320 USB RAID En | Plastic |
Factors to Consider When Choosing Jbod Enclosure For Large Storage Pools
I would start with capacity and drive layout, then check how the enclosure will connect to the computer and fit into your storage routine. These two options share a USB speed class, but they serve different pool sizes and management needs.Count bays before comparing speed
For a large pool, bay count is the clearest difference. The D6-320 holds six drives and lists up to 132TB, while the D2-320 holds two and lists up to 44TB. More bays can give you additional room to expand without replacing the enclosure, but capacity depends on the drives installed and the way the host system presents them. If you only need a pair of drives, the D2-320 may be enough; if you expect the collection to grow, the D6-320 has a much higher ceiling.
Match RAID support to your storage plan
The D2-320 lists RAID modes, including RAID 1 for mirroring, as well as RAID 0, JBOD, and Single mode. The D6-320’s supplied details say it does not support RAID configurations. That makes the smaller enclosure a better fit for someone who specifically wants an enclosure-level two-drive arrangement, but it does not make it the stronger large-pool option. Before choosing a mode, check how it affects usable capacity and what happens if a drive fails. Keep another copy of important files outside the enclosure: RAID is not a backup.
Treat the USB rate as a connection limit, not a guarantee
Both products list USB 3.2 Gen 2 at up to 10Gbps. That describes the connection interface, not a promise that drives will deliver that speed during every task. Performance also depends on the installed drives, the host computer, and the work being done. A collection of hard drives used for backups or media storage has different demands from frequent work with large active files. The shared interface means your choice between these two should rest more on bay count, RAID features, and physical fit than on the stated USB rate.
Plan for power, space, and drive installation
Both enclosures are diskless and require external power, so account for the drives, power connection, and desk or shelf space before buying. The D6-320 is heavier and uses a metal enclosure; its larger body is the tradeoff for six bays. The D2-320 is lighter, with tool-free installation, but uses plastic. Hot-swap support is listed for the D6-320, which can make drive changes more convenient. If the enclosure will sit in a shared workspace or move between locations, size, material, cabling, and access to the drives deserve as much attention as capacity.
Remember that USB storage depends on a host
These are USB-attached enclosures, not network storage appliances. A connected Windows, Mac, or Linux computer is part of the D6-320 setup, and the D2-320 likewise connects over USB. If your aim is shared access for several devices without leaving a computer attached, these products may not fit that requirement. For a local pool attached to a workstation or server, USB can keep the setup direct; for network sharing, check for a separate NAS or server-based arrangement rather than assuming a multi-bay enclosure provides it.
Frequently Asked Questions
Which of these is better for a large storage pool?
The D6-320 is the better match because it offers six bays and lists up to 132TB, compared with two bays and up to 44TB for the D2-320. It provides more room to add drives, though it does not list RAID support. Choose the D2-320 instead if two-drive RAID modes matter more than expansion.
Does the D6-320 support RAID?
The supplied product details state that the D6-320 does not support RAID configurations. It is a six-bay USB enclosure intended for connecting drives to a host system, so buyers who want the listed RAID 0 or RAID 1 modes should consider the D2-320. Confirm how your operating system or storage software will manage drives before relying on a particular layout.
Is JBOD the same as a backup?
No. JBOD describes a way of using drives; it does not create a separate copy of your files or protect data from every failure. The D2-320 lists JBOD mode, but important files still need an independent backup, such as another drive or a separate storage system. RAID modes also should not be treated as replacements for backup.
Do either of these enclosures include hard drives?
No. Both products are described as diskless enclosures, so you need to supply compatible drives separately. The D6-320 supports six SATA drives, and the D2-320 supports two SATA drives and lists hard disks and SSDs as supported devices. Check the drive form factor and capacity requirements before choosing disks for either enclosure.
Will these enclosures work as network-attached storage?
They are presented as USB-connected enclosures, not standalone NAS devices. A computer or another compatible host needs to connect to the enclosure and handle access to its storage. If you need network sharing without a host computer, look for a system designed for that purpose, or confirm that your planned server setup can provide the access you want.
Conclusion
For a buyer building a large, locally attached storage pool, I recommend the D6-320: six bays and a listed 132TB maximum make it the clear capacity choice, provided you do not need enclosure-level RAID. For a buyer who wants a two-drive setup with listed RAID modes, the D2-320 is the better fit, trading substantial expansion room for RAID flexibility and a lighter body. I would skip both if the priority is standalone network access, and I would plan separate backups whichever model you choose.
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