TerraMaster u4-423

About the Product

1U rackmount 4-bay NAS for HDDs and SSDs
Intel Celeron N5095 quad-core CPU with 4K transcoding support
4 GB RAM, expandable up to 32 GB
Dual 2.5 GbE LAN ports (link aggregation supported)
RAID 0/1/5/6/10 support plus online expansion
M.2 NVMe slot for SSD caching
Supports ~88 TB maximum raw storage
USB 3.1 and HDMI 2.0 ports for connectivity
Designed for file storage, backups, and media streaming

TERRAMASTER U4-423 2.5GbE NAS Rackmount 1U 4-Bay High Performance for SMB with N5105/5095 Quad-core CPU, 4GB DDR4 Memory, 2.5GbE Port x 2, Network Storage Server (Diskless)

Description

TerraMaster U4‑423 — a compact 1U rackmount 4‑bay NAS (network‑attached storage) with an Intel Celeron quad‑core CPU, dual 2.5 GbE networking, and support for up to ~88 TB of drives — built for small/medium business file storage, backups and multimedia applications

TerraMaster U4-423 NAS — 4‑Bay Rackmount NAS Overview

🔧 Key Specifications

CPU: Intel® Celeron® N5095 quad‑core 2.0 GHz (up to 2.9 GHz) x86 processor with hardware encryption and 4K video transcoding support.
Memory: 4 GB DDR4 RAM (1×4 GB), expandable up to 32 GB (2 DIMM slots).
Drive Bays: 4 × SATA (supports 3.5″ & 2.5″ HDD/SSD).
Max Raw Capacity: Up to ~88 TB (with 22 TB drives ×4), depending on sizes.
RAID: Supports RAID 0/1/5/6/10 plus online expansion and migration.
Network: Dual 2.5 GbE LAN — can be aggregated for up to ~5 Gbps combined throughput.
NVMe Slot: Built‑in M.2 NVMe SSD slot for SSD cache acceleration.
Ports: 2× 2.5GbE, 2× USB 3.1 (10 Gbps), 1× HDMI 2.0 for direct output.
File Systems: Btrfs/EXT4 internally; external drive support for EXT3/EXT4/NTFS/FAT32/HFS+.
Form Factor: 1U rackmount with a shallow depth (~360 mm) — fits many cabinets.
Weight: ~6.8 kg.

Performance & Features

High throughput for small business environments and heavier workloads thanks to 2.5 GbE links and link aggregation.
Supports multiple RAID levels for redundancy and performance.
SSD caching (NVMe) helps boost performance under heavy file operations.
Rich backup options include snapshot, cloud sync, centralized backup, and more.
Quiet and compact design with intelligent cooling.

Use Cases

Centralized file storage for teams.
Media server/streaming (4K transcoding supported).
Backup server for PCs, servers, and cloud sync.
Virtual services like FTP, web, databases, and mail hosting.

Pros

Excellent hardware for the price segment with a full Intel CPU and expandable RAM.
Gigabit plus networking (2.5 GbE) enables faster transfers than typical 1 Gb NAS units.
Flexible RAID and cache options.

⚠️ Considerations

Software (TOS) can feel less polished compared to Synology/QNAP for some users. User experiences online note occasional bugs or OS limitations — worth researching before purchase.
RAID syncing and performance depend heavily on disks and network setup.