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.
At a Glance
Synology DS223 Home & Office Backup Hub (2-Bay Diskless NAS)
↓ See why we picked itA 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.
5 Criteria to Look For Before Buying a Diskless NAS Enclosure
Key buying criteria so you get the right fit the first time.
Remember every listed NAS here is diskless, budget drives separately
The price shown for a NAS enclosure covers the hardware chassis, CPU, and RAM only, not the actual storage drives, NAS-grade drives built for 24/7 operation like Seagate IronWolf or WD Red still need to be budgeted on top, often adding $80 to $200 or more per bay depending on capacity and drive type.
This matters because comparing NAS units purely by enclosure price without factoring in drive cost gives a misleading picture of the real total investment, a cheaper enclosure with more bays to fill can end up costing more overall than a pricier enclosure with fewer bays.
Check whether a listing is diskless or ships with drives included, and add realistic per-bay drive costs to the enclosure price before comparing total cost across options.
Weigh CPU class and RAM over bay count for real day-to-day performance
Bay count determines maximum storage capacity, but CPU architecture (Intel, AMD, or ARM) and RAM amount determine how well the NAS actually handles real workloads, running apps, transcoding media on the fly, or serving multiple simultaneous users, and a higher bay count with a weak CPU can bottleneck performance regardless of how much raw storage it holds.
This matters more the more the NAS will do beyond simple file storage, like Plex transcoding or running multiple docker containers, less if it's purely a basic backup target.
Check the specific CPU model and RAM amount (and whether RAM is upgradeable) rather than choosing primarily by bay count.
Understand RAID as a rebuild-time safety net, not a substitute for real backup
RAID configurations protect against a single drive failure by letting the array rebuild from redundant data, but RAID is not a backup, it does nothing to protect against accidental deletion, ransomware, theft, fire, or a controller failure that affects the whole array at once.
This distinction matters because treating RAID redundancy as sufficient backup protection is a common and genuinely risky misunderstanding, a real backup strategy needs a copy of critical data stored somewhere physically separate from the NAS itself.
Check what RAID level a given NAS supports, and separately plan an actual backup strategy, ideally following a 3-2-1 approach, rather than relying on RAID redundancy alone.
Match drive type (HDD vs SSD/NVMe) to your actual access pattern
Traditional hard drives offer the lowest cost per terabyte for bulk storage like media libraries or backups, while SSD or NVMe-based NAS storage costs significantly more per terabyte but delivers much faster random access speeds, genuinely useful for frequently-accessed files, active project work, or serving as a fast cache tier.
This matters directly based on how you'll actually use the storage, a media library accessed sequentially benefits little from SSD speed, while an active working file share benefits considerably.
Check whether the NAS supports the drive type you need, and weigh the real cost-per-terabyte difference against how much you'll actually benefit from faster random access.
Consider noise level if the NAS will run continuously in a shared living or office space
A NAS that runs 24/7 generates continuous fan and drive noise, and that noise profile varies meaningfully between models, some use larger, slower-spinning fans that stay genuinely quiet, while others rely on smaller, faster fans that produce a persistent whine noticeable in a quiet room.
This matters a great deal if the NAS will sit in a bedroom, living room, or shared home office rather than a dedicated closet or basement out of earshot.
Check reviews specifically for real-world noise level mentions during continuous operation, not just idle noise, since drive activity and fan speed both increase under load.
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.
Full DSM app ecosystem including Active Backup for Business. That's a real strength, but weigh it against the flip side: most expensive pick in this list.
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.
Worth calling out specifically: fewer third-party drive compatibility warnings than Plus-series. The catch is soldered RAM cannot 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.
Supports RAID 5 and SHR for real redundancy. Set against that, less CPU power than Plus-series for heavy transcoding. Both matter when comparing it to the other picks here.
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.
A genuine advantage here is that upgradeable RAM for future app needs. The tradeoff is pricier than the DS223j for the same starting bay count.
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.
Supports up to 64TB raw capacity. That's a real strength, but weigh it against the flip side: smaller app ecosystem than Synology DSM.
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 a competitive price 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. Worth calling out specifically: hardware RAID handled onboard, no network setup needed. The catch is not network-attached, only one host at a time.
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 a competitive price, 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. 10Gbps USB 3.2 Gen2 connection outpaces the TR-004's link speed. Set against that, direct-attached only, no network sharing. Both matter when comparing it to the other picks here.
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.
A genuine advantage here is that runs full DSM including monitoring apps. The tradeoff is only 2 bays limits total capacity and RAID options.
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 Rating Confidence: Highest Rated vs Most Reviewed
| Your priority | Recommended pick |
|---|---|
| Highest average rating | Synology 4 |
| Largest review base, strongest reliability signal | Synology 4 |
By Budget
| Budget | Recommended pick |
|---|---|
| Under $152 | TERRAMASTER D4 |
| Up to $700 | Synology 4 |
Bay Count vs Price
TERRAMASTER D4
The lower-priced option in this comparison, worth checking its CPU and RAM against your actual workload.
Synology 4
The higher-priced option, worth it if it offers real bay count or performance headroom above the cheaper pick.
Default to TERRAMASTER D4 unless your storage needs genuinely call for the pricier pick.
By CPU and RAM
Check each pick's listed CPU architecture and RAM amount against your actual workload before buying, not just bay count alone. Synology 4 is the most-reviewed option here if you want the safer bet.
For Media Streaming or Plex Specifically
Look for
A CPU capable of hardware transcoding and enough RAM to handle multiple simultaneous streams, not just total bay count.
In this comparison
Synology 4 is worth checking against its listed CPU and RAM before buying, given its strong review base.
When to Spend More
Spend more if
You need real multi-user performance, media transcoding, or business-critical reliability, where Synology 4's CPU and RAM give real headroom over the cheaper picks.
Save if
You just need simple backup storage for one or two users, where TERRAMASTER D4 covers the same job at a lower price.
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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