Overview
The Ubiquiti UNAS-2-B is a black UniFi Network Attached Storage system with two 3.5-inch HDD bays, 2.5GbE networking, and 5Gbps USB-C connectivity. Its compact desktop enclosure is managed through UniFi Drive and supports centralized file storage, sharing, snapshots, and backup functions.
Storage and RAID
The UNAS 2 provides two 3.5-inch HDD bays with a maximum combined drive power budget of 52W. RAID 1 is supported for mirrored storage across the two drive bays. The system also supports USB storage through its USB-C expansion port.
Network and Connectivity
A single 2.5GbE RJ45 interface supports 2.5G, 1G, 100M, and 10M Ethernet. The same Ethernet interface is used for network connectivity and PoE++ power. A 5Gbps USB-C port provides expansion connectivity, while Bluetooth 4.1 is available for compatible wireless accessories.
UniFi Drive Features
UniFi Drive supports SMB and NFS file protocols and provides personal and shared drives, file encryption, snapshots, share links, Time Machine backup, remote UNAS backup, CIFS/SMB server backup, and cloud backup destinations including Google Drive, OneDrive, Dropbox, Amazon S3, Backblaze B2, and Wasabi.
Key Features
- Two 3.5-inch HDD bays with RAID 1 support
- 2.5GbE RJ45 networking with 2.5G/1G/100M/10M support
- 5Gbps USB-C expansion port
- 4GB memory and quad-core ARM Cortex-A55 processor
- 60W PoE++ adapter included
Applications
The UNAS-2-B is designed for centralized file storage, shared network folders, workstation backups, personal storage, and UniFi-managed backup deployments. RAID 1 provides mirrored storage when two compatible HDDs are installed.
Specifications
| Specification | Details |
|---|
| Brand | Ubiquiti |
| Part Number / MPN | UNAS-2-B |
| Product Type | Network Attached Storage |
| Product Family | UniFi UNAS 2 |
| Color | Black |
| Form Factor | Desktop |
| Drive Bays | 2 × 3.5-inch HDD |
| Hard Drive Support | 2 × 3.5-inch HDD |
| Maximum Drive Power Budget | 52W |
| Networking Interface | 1 × 2.5GbE RJ45 |
| Ethernet Speeds | 2.5G / 1G / 100M / 10M |
| Expansion Port | 1 × 5Gbps USB-C |
| Wireless Interface | Bluetooth 4.1 |
| Processor | Quad-Core ARM Cortex-A55, 1.7GHz |
| System Memory | 4GB |
| RAID Type | RAID 1 |
| Supported File Protocols | SMB, NFS |
| Maximum Power Consumption | 60W |
| Power Method | PoE++ |
| Power Supply | 60W PoE++ adapter, included |
| Display | 1.47-inch color LCM |
| Enclosure Material | Polycarbonate |
| Dimensions | 135 × 129 × 223.7 mm |
| Weight | 1.3 kg |
| Operating Temperature | -5°C to 40°C |
| Operating Humidity | 10–90% noncondensing |
| Management | UniFi Drive |
| Application Requirement | UniFi Drive 3.1.7 or later |
| NDAA Compliant | Yes |
| Certifications | FCC, CE, IC |
FAQs
How many drives can the UNAS-2-B hold?
The UNAS 2 has two bays for 3.5-inch HDDs.
Does the UNAS-2-B include hard drives?
No. The HDDs are not included and must be selected separately.
Which RAID mode does the UNAS 2 support?
The UNAS 2 supports RAID 1, which mirrors data between the two installed HDDs.
What network speed does the UNAS-2-B support?
Its RJ45 interface supports 2.5GbE as well as 1GbE, 100Mbps, and 10Mbps Ethernet.
