Overview
The Ubiquiti UNAS-4-W is the white version of the UniFi UNAS 4 network attached storage system. It provides four 2.5/3.5-inch drive bays, two M.2 NVMe SSD cache slots, 2.5GbE networking, and a 5Gbps USB-C expansion port in a compact desktop enclosure.
Storage Architecture
The UNAS 4 supports up to four 2.5/3.5-inch HDDs or SSDs as primary storage and two M.2 NVMe SSDs for caching. Ubiquiti supports RAID 5, RAID 6, and RAID 10 configurations, with a maximum supported NVMe SSD cache capacity of 2 TiB.
Network and Connectivity
A 2.5GbE RJ45 interface provides the network connection and supports 2.5G, 1G, 100M, and 10M Ethernet speeds. The 5Gbps USB-C port provides connectivity for compatible USB storage and other supported peripherals.
Management and Storage Features
The UNAS 4 is managed through the UniFi Drive platform and supports SMB and NFS file protocols. Additional features include file encryption, snapshots, Time Machine backup, remote UNAS backup, backup to CIFS/SMB servers, and backup to supported cloud services.
Key Features
- Four 2.5/3.5-inch HDD or SSD bays
- Two M.2 NVMe SSD cache slots with up to 2 TiB supported cache capacity
- 2.5GbE Ethernet with support for 2.5G, 1G, 100M, and 10M speeds
- RAID 5, RAID 6, and RAID 10 support
- 5Gbps USB-C expansion and USB storage support
Applications
The UNAS-4-W is suited to centralized file storage, shared network folders, backups, snapshots, and other UniFi Drive storage deployments where four internal drive bays and 2.5GbE network access are required.
DC Supplies Product Note
The UNAS-4-W uses PoE+++ for power and includes a 90W PoE+++ adapter, so the network installation should provide an appropriate PoE+++ power path if the included adapter is not being used.
Specifications
| Brand | Ubiquiti |
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| Part Number / MPN | UNAS-4-W |
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| Product Type | Network Attached Storage |
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| Color | White |
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| Form Factor | Desktop |
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| Drive Bays | 4 × 2.5/3.5-inch HDD/SSD |
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| M.2 NVMe Bays | 2 |
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| Maximum NVMe SSD Capacity | 2 TiB |
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| Networking Interface | 1 × 2.5GbE RJ45 |
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| Ethernet Speeds | 2.5G / 1G / 100M / 10M |
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| Expansion Port | 1 × USB-C, 5Gbps |
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| Processor | Quad-Core ARM Cortex-A55, 1.7 GHz |
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| Memory | 4 GB |
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| RAID Types | RAID 5, RAID 6, RAID 10 |
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| Supported File Protocols | NFS, SMB |
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| SSD Cache | Supported |
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| File Encryption | Supported |
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| Snapshots | Supported |
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| Time Machine Backup | Supported |
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| Remote UNAS Backup | Supported |
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| Cloud Backup | Google Drive, OneDrive, Dropbox, Amazon S3, Backblaze B2, Wasabi |
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| Management | Ethernet / UniFi Drive |
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| Bluetooth | Bluetooth 4.1 |
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| Power Method | PoE+++ |
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| Power Supply | 90W PoE+++ adapter, included |
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| Maximum Drive Power Budget | 80W |
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| Maximum Power Consumption | 90W |
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| Display | 1.47-inch color LCM |
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| Dimensions | 246 × 129 × 224.5 mm |
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| Weight | 2.6 kg |
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| Enclosure Material | Polycarbonate |
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| Operating Temperature | -5 to 40°C |
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| Operating Humidity | 10–90% noncondensing |
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| NDAA Compliant | Yes |
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| Certifications | FCC, CE, IC |
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FAQs
How many drives can the UNAS-4-W hold?
It has four 2.5/3.5-inch drive bays for compatible HDDs or SSDs, plus two M.2 NVMe slots for SSD caching.
Which RAID levels does the UNAS-4-W support?
Ubiquiti specifies RAID 5, RAID 6, and RAID 10 support.
Does the UNAS-4-W have 2.5GbE networking?
Yes. It has one 2.5GbE RJ45 interface supporting 2.5G, 1G, 100M, and 10M Ethernet speeds.
What is the purpose of the M.2 NVMe slots?
The two M.2 NVMe slots are intended for SSD caching. Ubiquiti specifies support for up to 2 TiB of NVMe SSD cache capacity.
