8 Best Diskless NAS Enclosures in 2026
8 best diskless NAS enclosures in 2026, from 2-bay Synology home hubs to 4-bay DAS and NAS units. Compare bays, RAID support, and drive compatibility.
Comparison Table
| Pick | Product | |
|---|---|---|
| Best Overall | Synology 4-Bay DiskStation DS925+ (Diskless) | Check price |
| Best Budget 2-Bay | Synology 2-Bay DiskStation DS223j (Diskless) | Check price |
| Best 4-Bay Value | Synology DS423 4-Bay Diskless NAS | Check price |
| Best Expandable 2-Bay | Synology DS725+ Expandable 2-Bay Diskless NAS | Check price |
| Best Value 2-Bay | UGREEN NAS DH2300 2-Bay Desktop NAS (Diskless) | Check price |
| Best DAS Enclosure | QNAP TR-004 4-Bay USB Type-C DAS (Diskless) | Check price |
| Best 10Gbps DAS | TERRAMASTER D4-320 4-Bay USB 3.2 Gen2 Enclosure (Diskless) | Check price |
| Best for Backup Hub | Synology DS223 Home & Office Backup Hub (2-Bay Diskless NAS) | Check price |
Prices are approximate. Check Amazon for current pricing before purchasing.
A diskless NAS enclosure is sold empty on purpose, it lets you pick your own drives instead of paying a markup on whatever capacity the manufacturer bundled in. That flexibility only pays off if you buy the right drive type for it, since not every hard drive marketed toward consumers is actually built to survive a RAID rebuild inside a multi-bay enclosure.
Below are 8 diskless NAS enclosures we evaluated on bay count, RAID and hardware compatibility, drive support honesty, and how clearly each one signals what kind of drive it actually needs, ranging from a $151.99 4-bay DAS enclosure to a $700 4-bay Synology built for small business workloads.
6 Criteria to Look For Before Buying a Diskless NAS Enclosure
Key buying criteria so you get the right fit the first time.
Buy CMR drives, not SMR, for any RAID array
SMR (Shingled Magnetic Recording) drives write new data by overlapping existing tracks, which slows dramatically during a RAID rebuild and can cause the rebuild to fail outright. CMR (Conventional Magnetic Recording) drives write to dedicated tracks and are the only sensible choice for RAID. Some lower-capacity drives marketed as "NAS" drives still use SMR, so check the specific model's recording type before buying, not just the marketing label.
Check the enclosure's hardware compatibility list before buying drives
Every NAS manufacturer publishes a list of tested, compatible drives. Buying an unlisted drive may still work, but RAID rebuild reliability and health reporting are not guaranteed the way they are for listed drives. This matters more on 2024+ Synology Plus-series models, which show compatibility warnings in DSM for non-Synology drives even when the drive itself is CMR and otherwise suitable.
Diskless makes sense when you already have drives or want flexibility
A diskless enclosure is the right call if you already own compatible drives or want to choose your own capacity and brand rather than pay a bundling markup. First-time NAS buyers who want to avoid drive-selection research may be better served by a NAS that ships with drives included, since diskless removes the drive decision anxiety at the cost of doing that research yourself.
Plan for drive temperature in multi-bay enclosures
Cheaper enclosures often use slower or weaker fans, and drive temperatures in a 4-bay unit can exceed safe long-term thresholds without adequate airflow. Enclosures with better fan curves and built-in temperature monitoring in their OS are worth the extra cost if the unit will run drives continuously.
Diskless means you install the OS yourself on first boot
A diskless enclosure ships with no pre-installed operating system. During first setup, the NAS OS downloads and installs automatically for most brands, but this requires an internet connection and takes real time. New buyers sometimes assume the OS is already installed and are surprised by this extra first-boot step.
Understand true total cost before comparing enclosure prices alone
A diskless enclosure's sticker price is only part of the purchase. Two or four NAS-grade CMR drives at current capacity pricing typically cost as much as, or more than, the enclosure itself, so compare total planned cost (enclosure plus drives) rather than judging enclosures on price alone.
8 Best Diskless NAS Enclosures in 2026
Synology 4-Bay DiskStation DS925+ (Diskless)
About this pick
The DS925+ is Synology's current 4-bay Plus-series enclosure, the tier that supports upgradeable RAM rather than the soldered memory found on entry Value-series models. That matters if you plan to add Plex, Surveillance Station, or other apps down the road rather than use the NAS purely for backup.
As a 2024+ Plus-series model, it shows compatibility warnings in DSM for non-Synology drives, a detail Synology doesn't advertise prominently. Synology-branded drives avoid the warning entirely but carry a 15-30% price premium over third-party NAS drives that will still work despite the flag.
Best for: Buyers who want long-term app flexibility and are willing to pay for it
Check price on AmazonPros
- +Upgradeable RAM avoids the early upgrade trap of soldered-RAM models
- +Full DSM app ecosystem including Active Backup for Business
- +Supports RAID 5, SHR, and RAID 10
- +4 bays leave real expansion room over a 2-bay unit
Cons
- −Most expensive pick in this list
- −Shows compatibility warnings for third-party drives
- −4 drives to buy separately adds real total cost
Synology 2-Bay DiskStation DS223j (Diskless)
About this pick
The DS223j is Synology's entry Value-series 2-bay enclosure, priced well below the Plus-series while still running the same DSM software. It's a genuinely simpler starting point for a first NAS, especially for buyers who just want centralized backup rather than a multi-app home server.
Value-series models carry less restrictive third-party drive compatibility than 2024+ Plus-series units, so a wider range of NAS-grade drives will run without DSM flagging a warning. The trade-off is soldered RAM that can't be upgraded later.
Best for: First-time NAS buyers who want simple backup without Plus-series pricing
Check price on AmazonPros
- +Lowest price among 2-bay Synology enclosures in this list
- +Fewer third-party drive compatibility warnings than Plus-series
- +Runs the same DSM software as pricier Synology models
- +Simple setup suited to first-time NAS buyers
Cons
- −Soldered RAM cannot be upgraded later
- −Only 2 bays limits total capacity and RAID options
- −Less CPU headroom for apps like Plex transcoding
Synology DS423 4-Bay Diskless NAS
About this pick
The DS423 sits between the budget DS223j and the Plus-series DS925+, offering 4 bays without the full Plus-series price tag. Four bays open up RAID 5 or SHR with a real spare-drive margin, something a 2-bay enclosure simply cannot do.
It's positioned for family and small-business backup, video surveillance, and photo storage rather than heavy multi-user app workloads, so it's a sensible pick for buyers who want more bays without paying Plus-series prices for RAM they may not need.
Best for: Buyers who want 4-bay RAID redundancy without Plus-series pricing
Check price on AmazonPros
- +4 bays at a lower price than the Plus-series DS925+
- +Supports RAID 5 and SHR for real redundancy
- +Includes surveillance and photo backup apps
- +Good middle ground between budget and Plus-series
Cons
- −Less CPU power than Plus-series for heavy transcoding
- −Fixed RAM on this tier
- −4 drives to buy separately adds real total cost
Synology DS725+ Expandable 2-Bay Diskless NAS
About this pick
The DS725+ starts as a 2-bay enclosure but supports an expansion unit to add more bays later, letting buyers start small and grow into a larger array without replacing the whole NAS. That expandability is unusual at the 2-bay tier and worth the premium over the DS223j for buyers who expect to outgrow 2 bays.
As a current-generation Plus-series model it carries upgradeable RAM and the same 2024+ third-party drive compatibility warnings as the DS925+, so budget for Synology-branded drives or expect a DSM warning flag with third-party NAS drives.
Best for: Buyers who want to start with 2 bays but plan to expand later
Check price on AmazonPros
- +Expansion unit support lets you grow past 2 bays later
- +Upgradeable RAM for future app needs
- +Small-business focused feature set
- +Current-generation Plus-series hardware
Cons
- −Pricier than the DS223j for the same starting bay count
- −Shows compatibility warnings for third-party drives
- −Expansion unit is a separate purchase
UGREEN NAS DH2300 2-Bay Desktop NAS (Diskless)
About this pick
UGREEN's DH2300 undercuts the Synology DS223j slightly while supporting up to 64TB of raw capacity across its 2 bays. As a non-Synology platform, its own hardware compatibility list applies rather than DSM's drive warnings, so it's worth checking UGREEN's published list before buying drives.
It's a legitimate lower-cost entry point into 2-bay diskless NAS for buyers who don't need Synology's specific app ecosystem and are comfortable with UGREEN's own NAS OS instead.
Best for: Budget-conscious buyers open to a non-Synology NAS platform
Check price on AmazonPros
- +Lower price than comparable Synology 2-bay enclosures
- +Supports up to 64TB raw capacity
- +No DSM-style third-party drive warnings
- +Compact desktop footprint
Cons
- −Smaller app ecosystem than Synology DSM
- −Newer platform with a shorter track record
- −Own compatibility list still needs checking before buying drives
QNAP TR-004 4-Bay USB Type-C DAS (Diskless)
About this pick
The TR-004 is a direct-attached storage enclosure rather than a network NAS, it connects over USB Type-C to a single computer instead of the network, with hardware RAID handled onboard. That makes it a different category from the network-attached picks in this list, useful for buyers who want RAID capacity attached directly to one machine rather than shared storage.
At 4 bays for $219, it's one of the cheapest ways to add hardware RAID 5 capacity to a single desktop or laptop, but it does not offer the multi-user network access, apps, or remote access that a true NAS enclosure provides.
Best for: Buyers who want RAID capacity for one computer rather than shared network storage
Check price on AmazonPros
- +Cheapest 4-bay hardware RAID enclosure in this list
- +Hardware RAID handled onboard, no network setup needed
- +Hot-swappable bays for easy drive replacement
- +Simple plug-and-play setup to one computer
Cons
- −Not network-attached, only one host at a time
- −No app ecosystem or remote access like a true NAS
- −Not a fit for multi-user or Plex-style use cases
TERRAMASTER D4-320 4-Bay USB 3.2 Gen2 Enclosure (Diskless)
About this pick
The D4-320 is the cheapest pick in this entire list at $151.99, another USB direct-attached enclosure rather than a network NAS, but its USB 3.2 Gen2 Type-C connection runs at 10Gbps, faster than the TR-004's USB Type-C link. That extra bandwidth benefits large sequential transfers to a single connected computer.
Like the TR-004, this is DAS, not NAS, so it lacks network sharing, apps, and multi-user access. It's the right pick for buyers who specifically want fast, low-cost RAID expansion for one machine and don't need network storage features.
Best for: Buyers who want the fastest, cheapest 4-bay RAID expansion for a single computer
Check price on AmazonPros
- +Lowest price of any pick in this list
- +10Gbps USB 3.2 Gen2 connection outpaces the TR-004's link speed
- +Hot-swappable, plug-and-play RAID setup
- +Compact 4-bay footprint
Cons
- −Direct-attached only, no network sharing
- −No app ecosystem for Plex, backup software, or remote access
- −Requires a computer with a fast enough USB port to see the speed benefit
Synology DS223 Home & Office Backup Hub (2-Bay Diskless NAS)
About this pick
The DS223 sits above the DS223j in Synology's lineup, marketed specifically around centralizing files, protecting data, and monitoring property, a straightforward pick for buyers whose main goal is automatic backup and file centralization rather than a broad app platform.
It runs full DSM with RAID 1 support across its 2 bays, giving basic mirrored redundancy for a home or small office backup target. Buyers who outgrow 2 bays later will need to step up to a 4-bay model like the DS423 or DS925+ in this list.
Best for: Buyers whose primary goal is centralized backup rather than a full app platform
Check price on AmazonPros
- +Positioned specifically for backup and file centralization
- +Runs full DSM including monitoring apps
- +RAID 1 provides basic mirrored redundancy
- +Mid-price point between DS223j and Plus-series models
Cons
- −Only 2 bays limits total capacity and RAID options
- −No RAID 5, only mirroring
- −Less CPU headroom than Plus-series for multi-app use
How We Evaluated These Diskless NAS Enclosures
Each pick was assessed across 5 criteria weighted for real-world use.
Bay count and RAID support
Compared 2-bay versus 4-bay layouts and which RAID levels each enclosure supports, since bay count directly limits redundancy options.
NAS versus DAS distinction
Separated true network-attached enclosures from USB direct-attached storage units, since the two solve different problems despite similar pricing and bay counts.
Drive compatibility posture
Checked whether each platform's compatibility list is restrictive, like 2024+ Synology Plus-series models flagging third-party drives, or more permissive.
RAM upgradeability and app headroom
Weighed soldered-RAM Value-series enclosures against upgradeable Plus-series models for buyers planning to add apps like Plex or Surveillance Station later.
Value at each bay tier
Compared price against bay count and features within the 2-bay and 4-bay groups separately, since a 2-bay and 4-bay enclosure aren't really competing for the same buyer.
How to Choose the Right Diskless NAS Enclosures
By Bay Count You Need
The picks in this list split cleanly into 2-bay and 4-bay enclosures, and the right count depends on how much redundancy and future expansion you actually need.
| Need | Bay count | Best pick |
|---|---|---|
| Simple backup hub, lowest cost | 2-bay | UGREEN NAS DH2300, Synology DS223j |
| Backup with monitoring apps | 2-bay | Synology DS223 |
| Start small, expand later | 2-bay expandable | Synology DS725+ |
| RAID 5 with real spare-drive margin | 4-bay | Synology DS423, DS925+ |
By Network NAS vs. Direct-Attached Storage
Want shared storage for multiple users or devices
Synology's DS223j, DS223, DS423, DS725+, and DS925+ are true network-attached NAS units that multiple devices can access at once.
Want RAID capacity for a single computer, no network needed
The QNAP TR-004 and TERRAMASTER D4-320 are direct-attached storage (DAS), connecting via USB to one host rather than the network.
Want the fastest single-host connection
The TERRAMASTER D4-320 runs USB 3.2 Gen2 at 10Gbps, faster than the TR-004's USB Type-C link, for large sequential transfers.
Want apps like Plex, Surveillance Station, or remote access
Only the network NAS picks support an app ecosystem; DAS enclosures like the TR-004 and D4-320 have none.
By Drive Compatibility Sensitivity
Not every enclosure treats third-party drives the same way, and this affects which drives you should shop for once the enclosure is decided.
| Pick | Drive compatibility posture | What to do |
|---|---|---|
| Synology DS925+, DS725+ (2024+ Plus-series) | Shows warnings for non-Synology drives | Budget for Synology-branded drives or accept the DSM warning flag |
| Synology DS223j, DS223, DS423 | Less restrictive than 2024+ Plus-series | Check Synology's compatibility list, wider third-party drive support |
| UGREEN DH2300 | Own hardware compatibility list, not DSM | Check UGREEN's published list before buying drives |
| QNAP TR-004, TERRAMASTER D4-320 | Own RAID controller compatibility | Confirm CMR drives on the manufacturer's list |
By RAM Upgrade Path
If you expect to add apps like Plex transcoding or Surveillance Station later, RAM upgradeability now avoids a forced hardware swap down the line.
| Tier | RAM | Best pick |
|---|---|---|
| Value-series, backup-focused | Soldered, fixed | Synology DS223j, DS223, DS423 |
| Plus-series, app-flexible | Upgradeable | Synology DS725+, DS925+ |
| Non-Synology platform | Check model specs directly | UGREEN DH2300 |
Buyers who are certain they'll only ever use the NAS for basic backup can save money on a Value-series model; buyers who might add Plex or business apps later should prioritize the upgradeable-RAM Plus-series tier now rather than replacing the enclosure later.
Frequently Asked Questions
What's the difference between a diskless NAS enclosure and a complete NAS with drives included?
A diskless enclosure ships empty, letting you choose your own drive brand, capacity, and recording type, which usually saves money over a bundled unit but requires you to research drive compatibility yourself. A complete NAS with drives included is simpler for first-time buyers who want to avoid that research, though it typically costs more for the same total capacity and locks you into the manufacturer's bundled drives.
Do I need CMR drives or can I use SMR drives in a diskless NAS?
Always use CMR (Conventional Magnetic Recording) drives for any RAID array. SMR (Shingled Magnetic Recording) drives write new data by overlapping existing tracks, which slows dramatically during a RAID rebuild and can cause the rebuild to fail entirely. Some lower-capacity drives marketed toward NAS use still use SMR, so verify the recording type on the specific model, not just the marketing label, before buying.
Why does my Synology NAS show a warning for a third-party drive that should be compatible?
2024+ Synology Plus-series models, including the DS925+ and DS725+ in this list, show compatibility warnings in DSM for drives that aren't Synology-branded, even when the drive is a suitable CMR NAS drive. Synology-branded drives avoid the warning but carry a 15-30% price premium over comparable third-party NAS drives. Older Value-series models like the DS223j and DS223 are less restrictive.
What's the difference between the DAS enclosures and the NAS enclosures in this list?
The QNAP TR-004 and TERRAMASTER D4-320 are direct-attached storage (DAS), they connect via USB to one computer and handle RAID onboard, but they have no network sharing, apps, or multi-user access. The Synology and UGREEN picks are true network-attached NAS units that multiple devices can access over the network and that support an app ecosystem like Plex or Surveillance Station.
Does a diskless NAS come with the operating system pre-installed?
No. A diskless enclosure ships with no OS installed. During first setup, the NAS operating system downloads and installs automatically for most brands, which requires an internet connection and takes real time on first boot. This first-boot installation step surprises some new buyers who assume the OS ships pre-loaded.
How many bays do I actually need for a home diskless NAS?
2 bays are enough for simple backup with basic RAID 1 mirroring, covered by picks like the Synology DS223j and DS223 in this list. 4 bays, like the DS423 or DS925+, open up RAID 5 or SHR with a real spare-drive margin and more total capacity, worth the extra cost if you expect to grow past basic backup into Plex, surveillance, or business use.
Bottom Line
best overall: Synology 4-Bay DiskStation DS925+ (Diskless) - best overall pick in this roundup.
See the full rankings above for all picks with pros, cons, and best-for summaries.
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