Ubiquiti UniFi
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UNAS Pro 4, US version
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Find on AmazonModel: UNAS Pro 4
A 1U rack-mount 4-bay NAS with 10G SFP+ networking, M.2 NVMe cache slots and the.
Important limit: Drives are not included
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Compare versions and packagesSpecifications checked November 5, 2026. Full product details
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Quad-Core ARM Cortex-A57 2.0 GHz
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Ubiquiti UniFi UniFi Network Attached Storage Pro 4 (UNAS Pro 4)
UNAS Pro 4, US version
Recorded model: UNAS Pro 4
Specifications checked 2026-11-05.
Raw capacity is before RAID and formatting. The example does not establish drive compatibility.
Capacity reference: Seagate Expansion Desktop 8TB External Hard Drive (STKP8000400). Capacity: 8TB. Drive manufacturer specification ↗
Drive planning and software explained →Photo credit: manufacturer image source ↗
Specifications explain hardware limits. No performance tests are claimed.
Ubiquiti UniFi UniFi Network Attached Storage Pro 4 (UNAS Pro 4)
A 1U rack-mount 4-bay NAS with 10G SFP+ networking, M.2 NVMe cache slots and the UniFi Drive application for file storage, backups and snapshots.
Selected package: UNAS Pro 4, US version.
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| Drive bays | (4) 2.5/3.5-inch SATA HDD/SSD bays (drives sold separately) |
|---|---|
| SSD cache | (2) M.2 NVMe SSD slots; up to 4 TiB NVMe cache capacity |
| Networking | (2) 10G SFP+ ports (10G only) and (1) GbE RJ45 management port (1G/100M/10M) |
| Processor and memory | Quad-Core ARM Cortex-A57 at 2.0 GHz; 8 GB DDR4 memory |
| Power | Internal 150W AC/DC supply, 100-240V AC; DC power backup with UniFi RPS; max. power consumption 150W |
| Form factor | 1U rack mount (442.4 x 400 x 43.7 mm; 17.4 x 15.7 x 1.7 in); 6.7 kg (14.8 lb); rails support 600 mm (23.6 in) rack depth |
| RAID | RAID 5, RAID 6 and RAID 10; single RAID group; SSD cache supported |
| File services | SMB and NFS shares, iSCSI not supported; file encryption; personal and shared drives; user groups |
| Backup | Snapshots, share links, Time Machine backup; backup to a remote UNAS, to a CIFS/SMB server, and to cloud services (Google Drive, OneDrive, Dropbox, Backblaze B2, Wasabi and S3-compatible storage) |
| Management | UniFi Drive application, managed over Ethernet; Bluetooth 4.1 radio for setup |
| Compliance | NDAA compliant; FCC, CE, IC certifications |
From manufacturer documentation, checked November 5, 2026. Spotted an error? Tell us.
A 2U rackmount NAS with twelve SATA bays, an Intel Atom C3538, 8 GB DDR4 (expandable to 128 GB), two 2.5GbE and two 1GbE ports, a PCIe slot for a 10GbE card and redundant 350W power supplies.
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A 4-bay Intel Celeron N5095 desktop NAS with 8 GB of DDR4 memory, two M.2 NVMe SSD slots, two 2.5GbE ports and one PCIe Gen 3 expansion slot.
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A four-bay Synology NAS with an AMD Ryzen V1500B, two 2.5GbE ports, ECC memory and two M.2 NVMe slots.
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