Buying Guide
8 Best 4-Bay Direct-Attached Storage
4-bay is DAS's strongest capacity tier. We verified true usable bay count, drive type, and RAID/JBOD mode before ranking.
By Jamie Cole, Lead Product Researcher
11 min read8 products evaluated
4 bays is arguably the sweet spot in DAS: enough capacity headroom for a real backup or media library without the size and cost of an 8-bay unit. Current products span everything from plain JBOD enclosures to genuine hardware RAID docks at this exact bay count.
We counted usable drive bays, confirmed whether all 4 bays support the same drive type and speed, and separated hardware RAID from individual-disk JBOD before ranking, since this bay count spans both architectures.
Quick Picks
Our 8 recommendations at a glance. Tap a pick for the full verdict.
Best Overall JBOD
Sabrent 4-Bay USB-C 10Gbps Hard Drive Enclosure (DS-SC4B)
buyers prioritizing 4x 3.5in bays, 10gbps usb-c
Our take Check price for Sabrent 4-Bay USB-C 10Gbps Hard Drive Enclosure (DS-SC4B) (opens in a new tab)
Best Value
TerraMaster D4-320 4-Bay USB DAS Enclosure (Diskless)
Buyers prioritizing 4-bay, up to 1,016mb/s combined
Our take Check price for TerraMaster D4-320 4-Bay USB DAS Enclosure (Diskless) (opens in a new tab)
Best Hardware RAID
QNAP TR-004 4-Bay USB-C DAS with Hardware RAID (Diskless)
5in bays, hardware raid 0/1/5/jbod
Our take Check price for QNAP TR-004 4-Bay USB-C DAS with Hardware RAID (Diskless) (opens in a new tab)
Budget Pick
CENMATE Aluminum 4-Bay Hard Drive Enclosure (5Gbps)
5in, up to 80tb total
Our take Check price for CENMATE Aluminum 4-Bay Hard Drive Enclosure (5Gbps) (opens in a new tab)
Best with Display Output
WAVLINK 4-Bay Hard Drive Enclosure with 4K HDMI (128TB)
Buyers prioritizing 4-bay, up to 128tb, 4k@60hz hdmi
Our take Check price for WAVLINK 4-Bay Hard Drive Enclosure with 4K HDMI (128TB) (opens in a new tab)
Best RAID + eSATA
CENMATE Aluminum 4-Bay Hardware RAID Enclosure (eSATA+USB)
Buyers prioritizing 4-bay hardware raid, 8 modes, up to 80tb
Our take Check price for CENMATE Aluminum 4-Bay Hardware RAID Enclosure (eSATA+USB) (opens in a new tab)
Best Budget RAID
ORICO 4-Bay RAID Hard Drive Enclosure (88TB, Aluminum)
Buyers prioritizing 4-bay raid, 8 modes, up to 88tb
Our take Check price for ORICO 4-Bay RAID Hard Drive Enclosure (88TB, Aluminum) (opens in a new tab)
Best with Offline Clone
Sabrent 4-Bay USB 3.0 Hard Drive Docking Station with Clone (DS-U3B4)
buyers prioritizing 4-bay, usb 3.0, 5gbps
Our take Check price for Sabrent 4-Bay USB 3.0 Hard Drive Docking Station with Clone (DS-U3B4) (opens in a new tab)
Our Picks
Best Overall JBOD1 of 8
Sabrent 4-Bay USB-C 10Gbps Hard Drive Enclosure (DS-SC4B)
5-inch SATA bays gets a stable, independent connection up to 80TB total (4x20TB) over a single 10Gbps USB-C port.
Best for
- buyers prioritizing 4x 3.5in bays, 10gbps usb-c
Why we like it
Drives ship empty and mount individually, JBOD-style, not hardware RAID. Tool-free trays, a locking key, a Kensington slot, and a 92mm active-cooling fan round out a build meant for 24/7 desk use, backed by a 1-year warranty extendable to 2 years.
Key specs
- 4x 3.5in bays, 10Gbps USB-C
- Dedicated ASM1351 controller per bay
- JBOD only, no RAID
Pros
- Independent controller per bay avoids one bad drive taking down the bus
- Tool-free trayless hot-swap with lockable bays
- 92mm active cooling for sustained 24/7 use
Cons
- No RAID, individual disks only
- Drives not included
Best Value2 of 8
TerraMaster D4-320 4-Bay USB DAS Enclosure (Diskless)
2 Gen 2's 10Gbps link, and supports drives up to 30TB each for 120TB total.
Best for
- Buyers prioritizing 4-bay, up to 1,016mb/s combined
Why we like it
It's explicitly 4 individual disks with no RAID function, using TerraMaster's tool-free Push-Lock tray design and hot-swap support. An intelligent temperature-controlled fan plus sound-absorbing panels cut noise up to 50% versus the prior generation, dropping under 21dB(A) in standby.
Key specs
- 4-bay, up to 1,016MB/s combined
- USB 3.2 Gen 2, 30TB/drive max
- No RAID, individual disks only
Pros
- Documented real-world throughput, not just link-rate marketing
- Under 21dB(A) standby noise is quiet
- Push-Lock tray design prevents accidental drive ejection
Cons
- No RAID function despite 4 bays
- Diskless, drives sold separately
Best Hardware RAID3 of 8
QNAP TR-004 4-Bay USB-C DAS with Hardware RAID (Diskless)
5-inch SATA bays, connected via USB Type-C for use as either standalone external storage or QNAP NAS backup expansion.
Best for
- 5in bays, hardware raid 0/1/5/jbod
Why we like it
QNAP is explicit about a real limitation: the TR-004's storage pool cannot be combined into a connected NAS's own pool, and drives can only migrate between TR-004 units, not to a different NAS model, a genuine gotcha worth knowing before buying it purely as NAS expansion.
Key specs
- 4x 3.5in bays, hardware RAID 0/1/5/JBOD
- USB Type-C
- Lockable drive bays
Pros
- True hardware RAID controller, not host software RAID
- Doubles as standalone DAS or NAS backup expansion
- Lockable bays for physical security
Cons
- Storage pool cannot merge into a connected NAS's own pool
- Drive migration limited to other TR-004 units only
Budget Pick4 of 8
CENMATE Aluminum 4-Bay Hard Drive Enclosure (5Gbps)
0 at up to 5Gbps under UASP, with hot-swap and tool-free tray installation.
Best for
- 5in, up to 80tb total
Why we like it
The company is upfront that its 2-inch cooling fan runs around 40-50 decibels, a real noise consideration for a desk setup, and this is explicitly a DAS unit with no RAID or NAS function, drives mount individually with a stable DC 12V power adapter.
Key specs
- 4-bay, 2.5/3.5in, up to 80TB total
- USB A/C 3.0, 5Gbps under UASP
- No RAID/NAS, individual disks
Pros
- Hot-swap and tool-free tray design
- Stable dedicated DC power adapter for multi-drive reliability
- Honest fan noise disclosure (40-50dB) upfront
Cons
- Fan noise may bother sound-sensitive desk setups
- No RAID despite 4 bays
Best with Display Output5 of 8
WAVLINK 4-Bay Hard Drive Enclosure with 4K HDMI (128TB)
2 Type-C port for daisy-chaining, on top of 4 SATA bays supporting up to 128TB total (4x32TB) over a 10Gbps USB-C connection.
Best for
- Buyers prioritizing 4-bay, up to 128tb, 4k@60hz hdmi
Why we like it
Dual built-in fans activate automatically at 48°C, and each of the 4 bays has an independent ON/OFF power switch for hot-swapping without powering down the whole unit. WAVLINK includes phone and email support with a 12-month warranty.
Key specs
- 4-bay, up to 128TB, 4K@60Hz HDMI
- 10Gbps USB-C, daisy-chain port
- Per-bay independent power switches
Pros
- 4K HDMI output doubles as a display dock, not just storage
- Per-bay power switches enable true hot-swap flexibility
- Dual auto-activating fans at 48°C threshold
Cons
- HDMI requires host USB-C port with video output support
- 2.5in drives need a separate mounting bracket, not included
Best RAID + eSATA6 of 8
CENMATE Aluminum 4-Bay Hardware RAID Enclosure (eSATA+USB)
Unlike CENMATE's non-RAID 4-bay model, this version adds a genuine hardware RAID controller (JMS567+JMB393 chip) supporting 8 modes: RAID 0/1/3/5/10, CLONE, LARGE, and NORMAL, switched via a physical toggle and reset-button sequence rather than software.
Best for
- Buyers prioritizing 4-bay hardware raid, 8 modes, up to 80tb
Why we like it
0 plus an ESATA output for an alternate connection path, at up to 5Gbps. CENMATE notes macOS has no RAID software support for this unit and warns that switching RAID modes can cause data loss, back up first.
Key specs
- 4-bay hardware RAID, 8 modes, up to 80TB
- USB 3.0 + ESATA, 5Gbps
- Physical DIP-switch RAID mode selection
Pros
- Genuine hardware RAID controller with 8 selectable modes
- Dual USB/ESATA connectivity options
- 150W-class stable power design for multi-drive RAID
Cons
- No macOS RAID software support
- RAID mode switching risks data loss if not backed up first
Best Budget RAID7 of 8
ORICO 4-Bay RAID Hard Drive Enclosure (88TB, Aluminum)
0 interface matched to SATA 6Gbps drives.
Best for
- Buyers prioritizing 4-bay raid, 8 modes, up to 88tb
Why we like it
A built-in 150W power supply avoids a bulky external adapter even with 4 high-consumption mechanical drives running simultaneously, and an 80mm silent cooling fan with front/rear vents handles sustained heat load. A tray-less design with an independent safety lock secures drives against accidental ejection.
Key specs
- 4-bay RAID, 8 modes, up to 88TB
- 235MB/s, built-in 150W power supply
- 80mm cooling fan, tray-less lock design
Pros
- Built-in 150W power supply eliminates a bulky external brick
- 8 RAID modes cover backup, capacity, and redundancy use cases
- Independent safety lock prevents accidental drive ejection
Cons
- 235MB/s ceiling is modest for a RAID-capable 4-bay unit
- 22TB per-drive limit caps total capacity below newer competitors
Best with Offline Clone8 of 8
Sabrent 4-Bay USB 3.0 Hard Drive Docking Station with Clone (DS-U3B4)
5-inch SATA drives with a useful offline drive-to-drive Clone function that works without a connected computer.
Best for
- buyers prioritizing 4-bay, usb 3.0, 5gbps
Why we like it
LED indicators display clone progress in real time during the standalone copy process, and trayless drive insertion keeps setup tool-free when the dock is powered off, with an external power adapter for stable multi-drive operation.
Key specs
- 4-bay, USB 3.0, 5Gbps
- Offline drive-to-drive Clone function
- Trayless tool-free insertion
Pros
- Offline Clone function works without a connected computer, useful for drive migration
- LED progress indicators during standalone cloning
- Trayless design for quick tool-free swaps
Cons
- 5Gbps USB 3.0 ceiling, not the newer 10Gbps tier
- No RAID, individual disks and cloning only
How We Chose
Each pick was assessed across 5 criteria weighted for real-world use.
- Connection & Drive Architecture
- Verified whether each product is direct-attached storage (USB, Thunderbolt, or SAS to one host) and whether drives mount individually, in JBOD, or under real hardware RAID, rather than assuming any multi-bay box works the same way.
- Real Interface Speed
- Checked the documented USB generation, Thunderbolt generation, or SAS link speed against real sustained throughput figures where manufacturers publish them, rather than repeating theoretical link-rate marketing numbers.
- RAID/JBOD Implementation
- Distinguished hardware-controller RAID from host-software RAID from plain JBOD/individual-disk presentation, since these have very different failure, portability, and rebuild behavior.
- Build, Cooling & Serviceability
- Weighed tool-free tray design, hot-swap support, fan noise where documented, and daisy-chain or expansion options against the product's likely desk, closet, or rack environment.
- Total Ownership Cost
- Considered that most DAS enclosures ship diskless, factoring in drive cost, cables, and RAID software where relevant rather than judging price on the empty enclosure alone.
What to Look for in a 4-Bay Direct-Attached Storage
Key buying criteria so you get the right fit the first time.
DAS means direct host attachment, not RAID
USB, Thunderbolt, and enterprise SAS storage can all be DAS. The term describes how the storage connects to a host, not whether it has RAID, what drive type it uses, or how many bays it has.
Bay count is not usable capacity
An 8-bay enclosure with 8x20TB drives does not give you 160TB of usable space in RAID 5 or RAID 6, parity drives eat real capacity. Calculate usable capacity under your intended RAID mode, not raw bay count times drive size.
Hardware RAID and host software RAID are not interchangeable
Hardware/enclosure RAID keeps the array portable across hosts and survives an OS reinstall; host software RAID (or SoftRAID on Mac) ties the array to specific software but is often more flexible and doesn't depend on one controller chip surviving.
The interface link rate is not your real transfer speed
A 10Gbps USB-C enclosure with 5 mechanical HDDs running simultaneously will bottleneck well below 10Gbps once you account for real sustained HDD throughput, typically 150-250MB/s per drive. Multi-drive aggregate speed matters more than the port's rated maximum.
RAID is not backup
RAID 1 or RAID 5 protects against a single drive failure, not against accidental deletion, ransomware, fire, or theft. Keep a genuine separate backup copy of anything irreplaceable, regardless of how much RAID redundancy your DAS provides.
Diskless enclosures need drives budgeted separately
Most multi-bay DAS enclosures ship completely empty. Factor in 2-8 hard drives or SSDs at your target capacity before comparing the enclosure's sticker price against a similarly-priced preconfigured external drive.
How to Choose a 4-Bay Direct-Attached Storage
By RAID Need
| Need | Best pick |
|---|---|
| Just want 4 independent bays | Sabrent DS-SC4B |
| Genuine hardware RAID | QNAP TR-004 or CENMATE RAID model |
| Offline drive cloning without a PC | Sabrent DS-U3B4 |
Frequently Asked Questions
How much usable capacity do I get from 4 drives in RAID 5?
RAID 5 across 4 equal-size drives gives you 3 drives' worth of usable capacity, the 4th is consumed by parity data that enables recovery from a single drive failure. Four 8TB drives in RAID 5 yields roughly 24TB usable, not 32TB.
Does RAID replace the need for a separate backup?
RAID protects against a single drive's hardware failure, but it does not protect against accidental deletion, ransomware, fire, theft, or a controller failure that affects the whole array at once. Keep a genuine separate backup copy of anything you can't afford to lose.
Do DAS enclosures come with drives included?
2 NVMe SSDs depending on the model. Budget for drive cost separately when comparing total price against a preconfigured external drive.
Will any USB-C or Thunderbolt cable give me full DAS speed?
Cable quality and rated bandwidth matter as much as the port. A basic charging-only USB-C cable can bottleneck a 10Gbps or faster enclosure well below its rated speed. Use the cable included with the enclosure, or one explicitly rated for the matching USB or Thunderbolt generation.
Can I add or remove drives from a DAS enclosure without powering it down?
Only if the specific enclosure documents hot-swap support, which most tool-free tray designs in this category do. Always check your specific product's hot-swap capability before removing a drive live, since not every budget enclosure supports it, especially some fixed-RAID-mode units.
Bottom Line
Best overall: Sabrent 4-Bay USB-C 10Gbps Hard Drive Enclosure (DS-SC4B) — best overall jbod pick in this roundup. See the full verdicts above for every pick, with pros, cons and who each one suits.
Browse all 4-bay direct-attached storage on Amazon — Prime-eligible options with current pricing.