TerraMaster NAS Review 2026: Best F-Series Model for Your Setup

This TerraMaster NAS review breaks down two hybrid storage systems from TerraMaster's F-Series — the F4-425 Plus and the F6-424 — so you can decide which one actually fits a home office, a media server, or a small-business backup setup before you buy from TerraMaster.

How TerraMaster NAS systems work

A TerraMaster NAS review has to start with the basic architecture, because both F-Series models reviewed here are hybrid systems, not plain hard-drive boxes. A hybrid NAS pairs traditional 3.5" HDD bays for bulk archival storage with dedicated M.2 NVMe SSD slots that can be used for caching, database acceleration, or frequently-accessed files. That split matters more in 2026 than it used to, since SSD prices have risen roughly 130% on surging AI data-center demand, making HDDs the more practical choice for high-capacity archival tiers while a small NVMe allocation still buys you fast read/write performance where it counts.

On the F4-425 Plus, that architecture is delivered by an Intel N150 quad-core processor (up to 3.6 GHz) with 16GB of DDR5 RAM and dual 5GbE network ports, capable of sequential write speeds up to 1020 MB/s and 4K video decoding. The F6-424 trades some of that per-drive speed for capacity and redundancy headroom: an Intel N95 quad-core processor (up to 3.4 GHz), 8GB of DDR5 RAM expandable to 32GB, dual 2.5GbE ports, and hardware transcoding for H.264, H.265, and MPEG-4 up to 4K/60fps.

Choosing between the F4-425 Plus and F6-424

Picking the right TerraMaster model comes down to how many drives you actually plan to run and what level of drive-failure protection you need, not just raw specs on a page. Work through these steps before you buy:

1. Count your drives, not your budget. RAID 5 needs a minimum of 3 drives and tolerates one drive failure; RAID 6 needs at least 4 drives and tolerates two simultaneous failures. If you only plan to run 3-4 drives, the F4-425 Plus's 4 bays are enough for RAID 5. If you want RAID 6-level protection with room to grow, the F6-424's 6 bays give you more headroom.
2. Decide if you need a dedicated SSD tier. The F4-425 Plus's 3 NVMe slots are built for caching or running a database/VM tier alongside HDD bulk storage. The F6-424 leans more toward pure bay count and RAID flexibility.
3. Check your network gear. The F4-425 Plus ships with dual 5GbE ports versus the F6-424's dual 2.5GbE ports — pairing either with a switch that supports the matching speed is what actually lets you hit the advertised throughput.
4. Plan your RAID or TRAID layout up front. TerraMaster's TRAID lets you pool mismatched drive sizes (for example 1TB + 4TB + 8TB + 24TB) into one volume while reclaiming roughly 30% more usable space than a traditional RAID array, with a TRAID+ option that adds dual-drive failure protection similar to RAID 6.

Common NAS buying mistakes

The most frequent mistake buyers make is treating RAID as a backup. RAID only protects against hardware failure — it does not protect against accidental deletion, ransomware, or data corruption, so a separate backup copy (ideally off-device or off-site) is still necessary regardless of which TerraMaster model you choose. A second common mistake is buying a 6-bay unit and populating only 3-4 drives on day one, which wastes the redundancy headroom that made the larger chassis worth the extra cost. A third is ignoring network speed: pairing a 5GbE-capable NAS with a 1GbE switch caps your real-world throughput far below the drive's potential.

TerraMaster models reviewed

Here's a closer look at both models covered in this TerraMaster NAS review, including what each is realistically best suited for.

Side-by-side comparison

What to look for in a NAS

Beyond brand and bay count, a few factors decide whether a NAS actually fits your workload long-term.

Drive count vs. RAID level

RAID 5 is generally recommended for NAS devices with fewer than 5 drive bays, while RAID 6 needs at least 4 drives and is the preferred option for business-critical workloads that need to survive two simultaneous drive failures. Match your bay count to the RAID level you actually intend to run, not the one that sounds best on paper.

Mixed-capacity pooling

If you're consolidating drives you already own rather than buying a matched set, TerraMaster's TRAID technology can pool mismatched capacities into one volume while still reclaiming roughly 30% more usable space than a traditional RAID array, with single-drive failure protection built in.

Hybrid SSD/HDD allocation

Dedicating a small NVMe allocation (1-4TB) to virtual machines, databases, or media serving while relegating bulk archives to HDDs is a practical way to balance the 2026 cost realities of SSD pricing against the performance you actually need day-to-day. If you also want a portable way to watch that media away from the desk, our Dopesplay lapdock review covers screens that pair well with a home server.

Alternatives to consider

If neither F-Series model matches your bay count needs, TerraMaster's own lineup extends both directions: smaller 2-bay units for basic backup redundancy, and larger 8-bay-plus systems for businesses that have already outgrown a 6-bay array. The core trade-off stays the same across the line: more bays buy you RAID headroom and capacity, while hybrid NVMe slots (where available) buy you a dedicated fast-storage tier for the workloads that benefit from it, like databases or virtualization.

References

1. Backblaze — NAS RAID Levels Explained
2. NASCompares — TerraMaster F4-425 Plus NAS Review
3. TerraMaster — F4-425 Plus Specifications
4. TerraMaster — F6-424 Specifications