Ubiquiti UNAS 2 UniFi 2-Bay Network Attached Storage - White (UNAS-2-W)
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AI Verdict
This is a 2-bay NAS with 2.5 GbE networking and PoE++ power, designed for basic file storage within a UniFi network.
This device is a situational fit for UniFi users who need basic, quiet storage and can leverage PoE++ power. Its 2.5 GbE port is a theoretical speed benefit, but the internal USB-attached NIC creates significant performance and reliability issues during heavy transfers. The limited RAID 1-only configuration also restricts storage flexibility.
If you need consistent, high-speed data transfers for large files or more flexible storage options, look for a NAS with a dedicated PCIe-based network interface and support for multiple RAID levels or JBOD.
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Pros
- Powers via PoE++ with an included 60W adapter, simplifying cabling and placement.
- Features a 2.5 GbE RJ45 networking interface for faster local data transfers.
- Integrates directly into the UniFi ecosystem, offering a streamlined setup and management experience.
- Operates quietly, with users reporting minimal noise even with 7200 RPM drives.
- Includes a 1.47" color LCM display for system status at a glance.
- Supports drive encryption, with the key not stored on the device after power cycles.
Cons
- The 2.5 GbE NIC is internally connected via USB, causing SMB/network drops and inconsistent throughput during large file transfers.
- Only supports RAID 1 for its two 3.5" drive bays; RAID 0 or JBOD configurations are not available.
- Drives are not hot-swappable, requiring the device to be powered down for replacement or upgrades.
- Lacks advanced NAS features like iSCSI, virtualization, or extensive third-party app integrations found in competing products.
- Apple Photos backup functionality is problematic, placing all photos in one directory and not setting correct timestamps.
Dimension Scores
Despite a 2.5 GbE port, the internal USB-attached NIC causes significant performance bottlenecks and network drops during large file transfers.
Users report frequent SMB/network drops and inconsistent throughput, making it unreliable for sustained, heavy data movement.
Two 3.5" bays are standard for a 2-bay NAS, but the limitation to RAID 1 only, with no JBOD or RAID 0, restricts how users can utilize the installed drive capacity.
While it integrates with UniFi, it has specific compatibility issues with Apple Photos backup and difficult NFS setup, limiting its utility for certain use cases.
Best For
- Existing UniFi network users needing a simple, dedicated device for basic file storage and backups.
- Environments where PoE++ power simplifies installation and reduces cable clutter.
- Users with light home file storage needs or occasional backups, not continuous heavy workloads.
- Individuals prioritizing a compact (135 x 129 x 223.7 mm) and quiet storage solution.
Not Recommended For
- Users requiring advanced NAS features like virtualization, iSCSI, or extensive media server capabilities.
- Anyone needing high-performance, consistent data transfers for large files or heavy concurrent access due to the USB-attached NIC bottleneck.
- Users who need flexible storage configurations beyond RAID 1, such as RAID 0 or JBOD.
Watch Out For
- The internal 2.5 GbE network interface uses a USB connection, leading to SMB session freezes and complete network drops during large data transfers.
- You can only configure the two drive bays in RAID 1; there's no option for RAID 0 or to use drives as independent volumes (JBOD).
- Apple Photos backup functionality is flawed, storing all photos in a single directory and failing to preserve original file timestamps.
- NFS access is difficult to configure, requiring individual IP address whitelisting and lacking user ID mapping or compatibility with drive encryption.
- Replacing or upgrading drives requires powering down the entire unit because the bays are not hot-swappable.
Full Specifications
| ASIN | B0G26S3HS8 |
| Size | 5.3 x 5.1 x 8.8 inches |
| Brand | Ubiquiti Networks |
| Color | White |
| Material | Plastic |
| Item Weight | 4.62 pounds |
| Manufacturer | Ubiquiti Networks |
| Item model number | UNAS-2-W |
| Product Dimensions | 8.81 x 5.08 x 8.81 inches |
What Buyers Say
This Ubiquiti UNAS 2 is a mixed bag, with early users reporting significant issues despite its promising specs. The most critical flaw appears to be the internal USB-attached 2.5 GbE NIC, which causes network drops and inconsistent speeds during large data transfers, making it unreliable for its primary function. While its PoE++ power and UniFi integration are convenient, the lack of flexible RAID options (only RAID 1) and basic software features are recurring complaints. Apple Photos backup is also noted as problematic, failing to preserve timestamps and organizing photos poorly.
“Man, I really wanted this to work for my UniFi setup, but the network keeps dropping when I try to copy big files. What's the point of 2.5GbE if it can't even handle a sustained transfer? Total headache.”
Common Praise
- PoE++ power simplifies installation and reduces cable clutter.
- Quiet operation, even with high-RPM drives installed.
- Seamless integration and setup within an existing UniFi network.
- Compact physical design (135 x 129 x 223.7 mm) fits well in small spaces.
- Drive encryption is available, and the key is not persistently stored on the device.
Common Complaints
- The 2.5 GbE network interface is internally connected via USB, leading to frequent SMB/network drops and poor performance during large file copies.
- Only supports RAID 1; no options for RAID 0 or JBOD (Just a Bunch Of Disks) for its two drive bays.
- Apple Photos backup is flawed, putting all photos in one directory and not retaining original timestamps.
- NFS access is difficult to configure, requiring manual IP whitelisting and lacking user ID mapping.
- Lacks advanced NAS features like iSCSI, virtualization, or a robust app ecosystem found in other NAS brands.
- Drives are not hot-swappable, necessitating a full shutdown for drive maintenance.
Ownership Tips
- The device runs Debian, allowing for some advanced SSH configurations, though these might be wiped with updates.
- Power consumption with two 7200 RPM drives is around 21W, which is efficient.
- The UI might show a warning about different sized drives even if it's not a functional issue for the user.
- Time Machine backups work easily, but SMB speeds for Mac users might need tuning for optimal performance.
- Snapshots are limited to one type (daily, weekly, or monthly) and lack granular hourly options.
Frequently Asked Questions
What kind of hard drives does the UNAS 2 support?
It supports two 3.5" SATA hard drives. You'll need to purchase these separately, as they are not included with the unit.
Can I use the two drive bays independently or in RAID 0?
No, the UNAS 2 only supports RAID 1 configuration for its two 3.5" drive bays. You cannot use them as separate volumes or in RAID 0.
How does the UNAS 2 get power?
It is powered via PoE++ (Power over Ethernet Plus Plus) and includes a 60W PoE++ adapter. This means it can receive both power and data through a single Ethernet cable.
What is the actual storage capacity of the UNAS 2?
The UNAS 2 itself does not have a fixed storage capacity; it depends on the two 3.5" hard drives you install. The '5 Gb' mentioned in some specs refers to the speed of its USB-C expansion port, not storage capacity.
Can I expand the storage with external drives?
Yes, it has one 5 Gbps USB-C expansion port that can mount external drives formatted in FAT32, exFAT, NTFS, and EXT4. However, these external drives cannot be used as backup destinations.
Is the UNAS 2 suitable for media streaming or running applications?
It is primarily designed for basic file storage and backups within the UniFi ecosystem. It lacks advanced features and app integrations for robust media streaming or running complex applications.
Buying Guide
When you're looking at a NAS like this, you're essentially buying a mini-computer designed just for storing files on your network. Don't get hung up on just the number of drive bays; think about how you'll use it. If you're just backing up a few documents, a basic model is fine. If you're streaming 4K movies to multiple devices or running a small business server, you need something much more powerful and flexible. Also, consider how it connects to your network – a fast port is useless if the internal components can't keep up.
Drive Bays (2 x 3.5")
This tells you how many hard drives you can put inside. Two bays means you can set up RAID 1 for data redundancy (if one drive fails, your data is safe on the other), but it also limits your total storage capacity compared to a single large drive. More bays generally mean more storage and more RAID options.
2.5 GbE RJ45 Networking Interface
This is how fast the NAS can talk to your network. 2.5 Gigabit Ethernet is faster than standard 1 Gigabit, which is great for quicker file transfers. Think of it like a wider highway for your data. However, the internal connection method (USB in this case) can bottleneck this speed, like having a wide highway that narrows right before your destination.
PoE++ Power Method
Power over Ethernet means the device gets both its power and network connection through a single Ethernet cable. This is super convenient because you don't need a separate power outlet near the NAS, giving you more flexibility on where you can place it, like in a closet or server rack.
Processor (Quad-Core ARM Cortex-A55 at 1.7 GHz) and Memory (4 GB RAM)
These are like the brain and short-term memory of the NAS. A faster processor and more RAM mean the NAS can handle more tasks simultaneously, like multiple users accessing files, running backups, or even basic apps, without slowing down. For basic file storage, this is usually sufficient, but for advanced tasks, you'd want more.
Alternatives
If this doesn't fit your needs, look for NAS devices with dedicated PCIe-based network interfaces for consistent high-speed transfers, support for multiple RAID levels (including RAID 0 and JBOD), and a broader software ecosystem for advanced applications.
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