A DAS (direct-attached storage) enclosure is a multi-bay USB or Thunderbolt box that plugs into one computer. It is not a NAS: there is no always-on OS, no app store, and no multi-user file sharing over the LAN unless the host PC shares the volume. That simpler job is exactly why desk backups, editors, and mini-PC shelves reach for USB RAID or JBOD enclosures instead of another network appliance. This shortlist covers current US Amazon 2-bay and 4-bay DAS boxes—hardware RAID where it helps, honest single-disk / JBOD boxes when you want the host OS to own the array—plus a CMR drive note so cheap SMR spindles do not wreck rebuilds.
What to Look For
Hardware RAID vs single-disk / JBOD. Hardware RAID (D2-320, TR-004) presents one volume and can rebuild mirrors or parity inside the box. Single-disk DAS boxes (D4-320, Mediasonic HF7, Sabrent DS-SC4B) show every bay as its own disk so the host can run Storage Spaces, SoftRAID, mdadm, or ZFS. Neither replaces a real backup. For vocabulary see What Is RAID? and RAID levels explained.
USB speed class. USB 3.2 Gen 2 / 10Gbps Type-C (D4-320, D2-320, HF7, Sabrent) has headroom for several spinning HDDs or a few SATA SSDs. Classic USB 3.0 / 5Gbps hardware RAID (TR-004) is still plenty for HDD archives, but it will not match a 10Gbps multi-SSD pipe.
Bay count and trays. Two bays cover RAID 1 mirrors and travel kits. Four bays cover RAID 5 / RAID 10 hardware arrays or a fat JBOD shelf. Prefer tool-free or trayless designs if you swap archive drives often.
CMR drives for arrays. When you fill a RAID or ZFS pool, prefer CMR (conventional magnetic recording) NAS or enterprise spindles. SMR drives can look cheap until a rebuild stalls. Plan a spare and know how to replace a failed RAID drive.
Power, cooling, and host habits. Multi-bay boxes need a real brick or internal PSU. Keep airflow clear, eject volumes cleanly, and put the DAS on a UPS if it holds the only local copy of anything important.
Best Overall: TerraMaster D4-320
The TerraMaster D4-320 is the default 4-bay desk DAS: USB 3.2 Gen 2 Type-C at 10Gbps, four tool-free hot-swap trays, and plug-and-play single-disk mode on Windows, macOS, and Linux. Maker sheets advertise combined multi-SSD peaks near 1,000 MB/s class and per-drive capacities into the 22–30TB range. There is no hardware RAID—arrays live on the host—which is exactly what SoftRAID, Storage Spaces, and ZFS users want. Street price sits near $171.
✓ Pros
- ✓ Real 10Gbps USB-C DAS with four hot-swap trays
- ✓ Single-disk mode plays nicely with host software RAID / ZFS
- ✓ Quiet temperature-controlled fan; strong review volume for the class
✕ Cons
- ✕ No hardware RAID controller in the box
- ✕ Plastic chassis; some reviewers report USB cable or spin-up quirks with heavy enterprise loads
- ✕ Not a network appliance—needs a host PC
Who it is for: desk backups, editors, and mini-PC shelves that want four trays on one 10Gbps cable. Who should skip it: buyers who need hardware RAID 5 without host software (see TR-004) or who only ever mount one spare drive (buy a dock instead).
Best 2-Bay Hardware RAID: TerraMaster D2-320
The TerraMaster D2-320 shrinks the same 10Gbps TerraMaster recipe into two bays with hardware RAID 0, RAID 1, JBOD, and Single. RAID 1 is the practical pick for a mirrored Time Machine or project archive that should survive one dead spindle without rebuilding in the OS. Street price is about $117.
✓ Pros
- ✓ Hardware RAID 0/1/JBOD/Single on USB 3.2 Gen 2 10Gbps
- ✓ Tool-free Push-lock trays; compact 2-bay footprint
- ✓ Listed SSD RAID 0 peaks above 1,000 MB/s class
✕ Cons
- ✕ Only two bays—no hardware RAID 5
- ✕ Hardware RAID details are less visible on Linux than on Windows/macOS utilities
- ✕ Still USB-attached; not a substitute for offsite backup
Best for mirrored 2-drive desk backups on USB4 / Thunderbolt / USB-C hosts. Skip if you need four trays or host-managed ZFS across more disks.
Best Hardware RAID 4-Bay: QNAP TR-004
The QNAP TR-004 is the grown-up hardware RAID DAS: USB Type-C, hardware RAID 0/1/5/JBOD/Individual, lockable trays, and QNAP External RAID Manager for health and mode changes. It is also a known expansion path for compatible QNAP NAS units. Interface tops out at USB 3.0 / 5Gbps, so treat it as an HDD archive and backup target rather than a multi-SSD speed demon. Street price is about $219.
✓ Pros
- ✓ Real hardware RAID 5 / 10-class options with management software
- ✓ Lockable bays; works as PC DAS or QNAP NAS expansion
- ✓ Large review base and mature accessory ecosystem
✕ Cons
- ✕ USB 3.0 5Gbps ceiling vs 10Gbps TerraMaster / Mediasonic / Sabrent peers
- ✕ Plastic trays feel cheaper than the metal shell
- ✕ Hardware RAID is not a backup—keep a second copy
Best for buyers who want hardware RAID 5 in a 4-bay USB box, or QNAP owners expanding a NAS. Skip if 10Gbps JBOD for ZFS matters more than onboard RAID.
Best JBOD for Software RAID: Mediasonic HF7-SU31C
The Mediasonic HF7-SU31C is the classic “just a box of disks” DAS: USB 3.2 Gen 2 Type-C at 10Gbps, UASP, SMART pass-through, power sync, and no hardware RAID. Each bay shows up independently so Linux ZFS, Windows Storage Spaces, or macOS software RAID can own the pool. Made-in-Taiwan Mediasonic ProBox lineage; street price near $140. Watch cooling—many owners run the door ajar or fan on manual high under sustained load—and note Power-Disable enterprise drives may need a pin cover.
✓ Pros
- ✓ Honest 10Gbps JBOD with SMART / UASP / power sync
- ✓ Ideal host for ZFS or Storage Spaces without a RAID chip in the way
- ✓ Strong value versus branded hardware RAID 4-bays
✕ Cons
- ✕ Mixed cooling reports; plan airflow or door-open installs
- ✕ Power-Disable enterprise HDDs need a workaround
- ✕ Lower average rating than TerraMaster / QNAP peers
Best for TrueNAS / Proxmox / SoftRAID users who refuse hardware RAID chips. Skip if you want one-button hardware RAID 5.
Best Trayless Hot-Swap: Sabrent DS-SC4B
The Sabrent DS-SC4B is the trayless aluminum 4-bay: USB-C 10Gbps, JBOD (not hardware RAID), per-bay power switches, and shove-in 3.5-inch SATA installs for burn-in and archive rotation. Listing capacity claims reach about 80TB class across four spindles. Street price is about $230.
✓ Pros
- ✓ Trayless hot-swap with per-bay power switches
- ✓ USB-C 10Gbps JBOD for host-managed arrays or independent volumes
- ✓ Aluminum shell; huge review count for the category
✕ Cons
- ✕ No hardware RAID
- ✕ Fan noise and occasional disconnect reports show up in reviews
- ✕ 2.5-inch drives need adapters; price sits above D4-320
Best for technicians who swap 3.5-inch archive drives constantly. Skip if you want quieter sealed trays (D4-320) or hardware RAID (TR-004 / D2-320).
Comparison
| Enclosure | Bays | Interface | RAID story | Best use | Street price |
|---|---|---|---|---|---|
| TerraMaster D4-320 | 4 | USB 3.2 Gen 2 10Gbps | Single-disk / host RAID | Best overall desk DAS | ~$171 |
| TerraMaster D2-320 | 2 | USB 3.2 Gen 2 10Gbps | Hardware 0/1/JBOD/Single | Mirrored 2-bay | ~$117 |
| QNAP TR-004 | 4 | USB 3.0 5Gbps Type-C | Hardware 0/1/5/JBOD | Hardware RAID 5 DAS | ~$219 |
| Mediasonic HF7-SU31C | 4 | USB 3.2 Gen 2 10Gbps | JBOD only | ZFS / software RAID | ~$140 |
| Sabrent DS-SC4B | 4 | USB-C 10Gbps | JBOD only | Trayless hot-swap | ~$230 |
The Bottom Line
Start with the TerraMaster D4-320 when you want four 10Gbps trays and host-side arrays. Choose the TerraMaster D2-320 for a compact hardware RAID 1 mirror, the QNAP TR-004 for hardware RAID 5 with management software, the Mediasonic HF7-SU31C when ZFS or Storage Spaces must own every disk, or the Sabrent DS-SC4B when trayless swaps dominate the workflow. Fill bays with CMR NAS drives, keep a spare, and remember RAID is not a backup. For network shares instead of USB, jump to the NAS explainer or the quiet apartment NAS upgrade path.
