TerraMaster NAS Devices — F-Series Prices & Specs 2026

TOS 6: improved, usable, and still the weak point

TOS 6 is TerraMaster's Linux-based OS, and credit where due: it has closed much of the gap. The current release brings a cleaner interface, proper snapshot support, Docker via its container app, an improved permission system, and the core NAS duties — shares, users, RAID management, backups — handled competently. For a household file-and-backup box, TOS 6 is genuinely sufficient.

It remains the weakest first-party OS among the brands we track. The app catalog is small, the mobile apps are serviceable rather than good, documentation is thin, and the polish gap against DSM is obvious within minutes. TerraMaster knows its audience, though: the boot process accommodates third-party OS installation, and the company has leaned into being the affordable chassis. That honesty about its role is part of why the community likes it — you are not paying for software you plan to replace.

Hardware value

The value proposition is stark. The F4-425 gives you a four-bay Intel x86 quad-core NAS for less than half of a comparable Synology; the F4-425 Plus steps up to the newer Intel N150; and the F4-424 Pro ships a genuinely quick i3-N305 with 32GB of DDR5 — workstation memory in a budget NAS — plus dual 2.5GbE and two NVMe slots. Even against UGREEN, TerraMaster undercuts on price, at the cost of slower networking (no 10GbE in this desktop range) and plainer chassis. As TrueNAS hosts, the F-series' x86 chips, NVMe slots and standard components make them the default community recommendation. All four models' live prices are in the table above; the per-dollar comparison against the other brand pages is rarely close.

Which model fits which buyer

The F2-425 is the cheapest x86 NAS in our entire table, and that sentence is most of its review. Two bays, an Intel quad-core, and a price that competes with consumer USB enclosures rather than other NAS units. As a mirrored backup target or an off-site replica sitting at a relative's house, it is unbeatable per dollar; as a primary do-everything box it will feel its limits, which is what the four-bay models are for.

The F4-425 is the volume pick and the model our hub's winner callout has featured — a four-bay x86 machine at a live price that RAID-5 shoppers on a budget simply cannot match elsewhere. The F4-425 Plus adds Intel's newer N150 for a modest step up in headroom. Both make excellent TOS boxes for household duty, and both make even better TrueNAS hosts: four bays, x86, standard parts, minimal cost — exactly the recipe the community recommends for a first proper ZFS build.

The F4-424 Pro is the sleeper in the lineup: an i3-N305 with eight cores and 32GB of DDR5 — memory Synology sells only on far more expensive units — plus dual 2.5GbE and two NVMe slots. For a Docker-heavy homelab or a small office fileserver that must also run a few services, it delivers workstation-class capability at a mid-range price. It is also arguably the best-value TrueNAS SCALE host on the market right now: the 32GB of RAM is precisely what ZFS wants, already installed. Compare its live price above against building the equivalent from parts and the case usually closes itself.

The first hour of ownership

If you are keeping TOS 6: the installer is straightforward, and the settings worth changing on day one are the same as everywhere — dedicated admin account, 2FA, auto-update, snapshots on every share, and no port-forwarded admin interface. TOS asks slightly more patience than DSM during pool creation, and its documentation is thinner, so budget a little extra time for the first setup. Once configured, the boxes run quietly and reliably; the OS's weaknesses show in daily-driver features, not in stability.

If you are installing TrueNAS or Unraid — the path many F-series buyers plan from the start — do it before any data lands on the drives. Community guides cover each model; the process is a USB boot away on these standard x86 machines. Run a memory test first (ZFS in particular deserves known-good RAM), confirm all bays detect under the new OS, and only then build your pool. Doing the conversion on an empty box turns a scary-sounding project into a half-hour task.

Track record and trajectory

TerraMaster spent its early years as the brand reviewers dismissed: cheap hardware, rough software, easy joke. The hardware half of that reputation has quietly inverted — recent F-series generations have been reliable, sensibly designed, and consistently first to bring current Intel budget silicon to the lowest price tier. TOS has improved genuinely across versions, even if it remains the trailing OS on this page.

The strategic read: TerraMaster found its lane and stopped apologizing for it. It sells the most machine for the least money and tacitly accepts that a large share of buyers will install their own OS — a segment the incumbents ignore. That positioning also makes the brand unusually future-proof for its owners: your investment is in standard x86 hardware, not in an ecosystem, so the boxes hold their usefulness regardless of where TOS goes. In a market defined by software lock-in stories, there is something to be said for the brand that cannot meaningfully lock you in.

Which drives to pair with it

TerraMaster bays accept any standard SATA drive — no compatibility list drama, ever. The usual guidance applies with extra force at this price point: buyers saving money on the enclosure are often tempted to save again with shucked externals or SMR bargains, and that is where the plan fails. Use CMR NAS drives; recertified enterprise drives are the smart budget play, frequently beating new NAS drives on per-terabyte cost with datacenter-grade hardware — see the live rankings on our recertified and NAS drive trackers. In RAID 5 or 6 the drives will outlast your patience with an SMR rebuild by a wide margin.

Live per-terabyte rankings: NAS drives · CMR drive list · recertified enterprise. Upgrading an existing array? The upgrade planner computes net cost after resale.

Who it's for — and who should skip it

Buy TerraMaster if: budget is the binding constraint; you plan to install TrueNAS or Unraid and want the cheapest solid x86 chassis; or you need a competent household file server and can accept unpolished software. Skip TerraMaster if: you want refined first-party apps and mobile clients (Synology), 10GbE out of the box (UGREEN), deep expansion (QNAP), or you would rather pay more than ever touch a settings page — TOS 6 asks a bit more of you than DSM does.

A useful budget frame: the money TerraMaster saves you on the enclosure is usually the price of one more drive. A four-bay F4-425 plus four drives can cost less than a rival's enclosure plus three — which means at equal total spend, TerraMaster buys you RAID 6 where the competition buys RAID 5, or an extra capacity step at the same protection level. In a drive-shortage market where the drives dominate the bill, the cheapest competent chassis is a strategy, not a compromise. The live prices above and on our NAS drive tracker let you run that exact comparison before you commit.

Frequently asked questions