TerraMaster F4-425 Plus: Specs, Drives and Total Build Cost
The F4-425 Plus is TerraMaster's 4-bay F-series NAS with an Intel N150 CPU. Below is what TerraMaster's own pages state about it - including a published drive-capacity ceiling most brands in this cluster do not state - what it costs filled with drives today, and its drive-compatibility position.
Hardware specifications, per TerraMaster's own pages
| Bays | 4 (plus 3 M.2 slots) |
|---|---|
| Drive form factors | 3.5-inch SATA HDD, 2.5-inch SATA HDD, 2.5-inch SATA SSD |
| M.2 slots | 3 x M.2 (PCIe 3.0 x1) |
| M.2 purpose | SSD cache OR an independent storage pool - TerraMaster's own explicit wording, not cache-only |
| Max single-drive capacity | 30TB per HDD bay (8TB per M.2 SSD) - a genuine published ceiling |
| RAM | DDR5 non-ECC SODIMM, 16GB installed (1 slot), maximum 32GB |
| Network | 2 x 5GbE |
| Expansion unit | TerraMaster states only a generic "TerraMaster USB DAS" expansion path with no named model or resulting bay count. |
| PSU | 90W |
| Published acoustic figure | 20.9 dB(A), TerraMaster's own stated test condition (standby, 4 drives, 1m) |
Source: TerraMaster F4-425 Plus product page, read 2026-09-14 — terra-master.com.
TerraMaster's own product page and blog both state the 3 M.2 slots can form their own RAID 5 array, and TerraMaster's blog describes them explicitly as serving "as high-speed cache or independent storage pools" - an unambiguous vendor statement of both roles, not cache-only.
The honest total: chassis + drives, three ways
$649.99 buys the empty chassis. Filling all 4 bays is the real purchase, priced at three genuinely different tiers below.
Best value fill - F4-425 Plus + 4 drives
Usable capacity by RAID level: RAID 1 12TB ($155.51/usable TB) · RAID 5 36TB ($51.84/usable TB) · RAID 6 24TB ($77.76/usable TB) · RAID 10 24TB ($77.76/usable TB) 4 items across 1 listing. In-stock listings only. Anything out of stock when this page loaded is named below rather than silently dropped.
| Item | Qty | Each | Line | |
|---|---|---|---|---|
| DriveWD Red Plus 12TB WD120EFGX (12TB) | x4 | $466.54 | $1866.16 | Buy on Amazon |
| Basket total | $1866.16 | |||
Left out because it is not in stock right now: TerraMaster F4-425 Plus 4-Bay.
These are our current tracked prices. Amazon sets the seller and the final price at checkout - verify before you buy. Opening any item starts an Amazon session, and anything you add there is part of the same order - you do not need to come back here between items.
Enterprise fill - F4-425 Plus + 4 drives
Usable capacity by RAID level: RAID 1 22TB ($174.35/usable TB) · RAID 5 66TB ($58.12/usable TB) · RAID 6 44TB ($87.17/usable TB) · RAID 10 44TB ($87.17/usable TB) 4 items across 1 listing. In-stock listings only. Anything out of stock when this page loaded is named below rather than silently dropped.
| Item | Qty | Each | Line | |
|---|---|---|---|---|
| DriveWD Red Pro 22TB NAS WD221KFGX (22TB) | x4 | $958.90 | $3835.60 | Buy on Amazon |
| Basket total | $3835.60 | |||
Left out because it is not in stock right now: TerraMaster F4-425 Plus 4-Bay.
These are our current tracked prices. Amazon sets the seller and the final price at checkout - verify before you buy. Opening any item starts an Amazon session, and anything you add there is part of the same order - you do not need to come back here between items.
Refurbished fill - F4-425 Plus + 4 drives
Usable capacity by RAID level: RAID 1 14TB ($99.71/usable TB) · RAID 5 42TB ($33.24/usable TB) · RAID 6 28TB ($49.86/usable TB) · RAID 10 28TB ($49.86/usable TB) 4 items across 1 listing. In-stock listings only. Anything out of stock when this page loaded is named below rather than silently dropped.
| Item | Qty | Each | Line | |
|---|---|---|---|---|
| DriveToshiba MG07ACA14TE 14TB SATA Enterprise (14TB) | x4 | $349.00 | $1396.00 | Buy on Amazon |
| Basket total | $1396.00 | |||
Left out because it is not in stock right now: TerraMaster F4-425 Plus 4-Bay.
These are our current tracked prices. Amazon sets the seller and the final price at checkout - verify before you buy. Opening any item starts an Amazon session, and anything you add there is part of the same order - you do not need to come back here between items.
The smallest cheque that fills all 4 bays, separately from the value tiers above: 4 x Seagate SkyHawk 6TB ST6000VX001 at $313.00 each = $1252.00.
The N150 platform, stated plainly
TerraMaster markets this model on its Intel N150 CPU, and the F4-425 Plus sits one step up from the base F4-425 in the same chassis family - the Plus suffix here names a CPU generation change, not a bay-count or form-factor difference. The 16GB of DDR5 shipped as standard is generous for a four-bay unit at this price point, and the single-SODIMM-slot ceiling of 32GB is a real hardware limit worth knowing before planning a larger memory upgrade than the chassis can physically hold.
Drive compatibility, measured
TerraMaster publishes one hard-drive compatibility list that covers its whole current F-series range rather than a separate list per machine - the F4-425 Plus resolves to 172 of that shared table's rows. There is no per-machine gate: TerraMaster's own posture names no drive restriction for this line.
109 SATA HDDs in our own catalogue are fit-verified for this class of bay right now (interface, form factor and CMR-confirmed).
TerraMaster's compatibility list, in full - one page for the whole series, because TerraMaster publishes one list for it.
Expansion limits and the M.2 reality
TerraMaster states only a generic "TerraMaster USB DAS" expansion path with no named model or resulting bay count.
The M.2 slots are the clearest case in this cluster of a vendor stating both roles explicitly and without hedging: TerraMaster's own product page and blog both confirm the 3 M.2 slots can run their own RAID 5 array, and TerraMaster's blog names the two uses directly - "high-speed cache or independent storage pools." No discrepancy to flag here, unlike the QNAP page in this cluster.
That clarity is worth noting against the rest of this cluster: buyers weighing an M.2 storage-pool build specifically can take TerraMaster's own wording at face value here, where the QNAP and UGREEN pages in this same cluster each carry a genuine documentation gap or discrepancy on the identical question. A published, unhedged answer to "what can the M.2 slots actually do" is itself a fact worth pricing into the decision, separate from the drive economics above.
What else it needs
Power protection: see UPS units for a NAS, priced live with output waveform stated on every row. The F4-425 Plus's dual 5GbE ports need a 5GbE-capable switch to be worth anything above 2.5GbE - check your switch before assuming the faster port helps. Four bays of CMR NAS drives is the natural pairing for this chassis's RAM ceiling and CPU class; see NAS hard drives, live $/TB before committing to a specific capacity.
Frequently asked questions
Frequently asked questions
How many drives does the F4-425 Plus take?
4 x 3.5-inch or 2.5-inch SATA bays, per TerraMaster's own product page, plus 3 M.2 slots that TerraMaster's own blog documents as usable for cache OR an independent storage pool - TerraMaster frames this as a "3+4 bay" design.
What's the maximum capacity of the F4-425 Plus?
TerraMaster states an explicit ceiling here, unlike most brands in this cluster: 30TB per HDD bay, and 8TB per M.2 SSD.
Can I use third-party drives in the F4-425 Plus?
Yes, without restriction. TerraMaster's own compatibility list covers 172 of the rows in its shared HDD compatibility table - a list published series-wide rather than gating any specific drive.
What does a complete F4-425 Plus build cost?
$649.99 for the chassis alone; $1866.16 filled with 4 best-value drives, or as little as $1252.00 for the smallest qualifying set.
Does the F4-425 Plus support 10GbE?
No - TerraMaster's own spec states dual 5GbE ports, and we found no documented expansion path to a faster port for this model.
Does TerraMaster document an expansion unit for the F4-425 Plus?
Only generically - TerraMaster's own page names "TerraMaster USB DAS" as an expansion path with no specific model number or resulting bay count stated.
Sources checked: TerraMaster F4-425 Plus product page, TerraMaster F4-425 Plus / F2-425 Plus debut (blog).