Main trade-off
Synology DiskStation DS425+
Two M.2 slots leave less SSD expansion room.
Head-to-head
Synology DiskStation DS425+ vs TerraMaster F2-425 Plus: Four SATA disks in Synology or two plus three NVMe slots
The short answer
Choose DS425+ when four SATA drives and the DSM workflow are the reason for buying. Choose F2-425 Plus when two SATA bays are enough and you want dual 5GbE, three NVMe slots or a larger memory ceiling.
Before you choose
The reasoning and the trade-offs
Two extra SATA bays change a four-disk plan
Four SATA disks fit DS425+ and exceed F2-425 Plus by two bays. Counting M.2 slots does not rescue that plan because the interfaces and drive formats differ.
What this is based on
4 required SATA drives - 2 TerraMaster SATA bays = 2 missing bays. Synology provides all four.
Main trade-off
TerraMaster F2-425 Plus N150 8GB
Only two SATA drives fit inside the enclosure.
Synology DiskStation DS425+
- Choose it for
- Install four SATA hard drives in one enclosure
- Keep a Synology DSM application and backup workflow
- Main trade-off
- Two M.2 slots leave less SSD expansion room.
TerraMaster F2-425 Plus N150 8GB
- Choose it for
- Build around two SATA drives and three NVMe slots
- Use dual 5GbE or expand supported RAM above 6GB
- Main trade-off
- Only two SATA drives fit inside the enclosure.
About this comparison
Compare DS425+ and F2-425 Plus for four hard drives versus a compact hybrid NAS, with concrete differences in Ethernet, NVMe slots and memory.
Choose DS425+ when four SATA drives and the DSM workflow are the reason for buying. Choose F2-425 Plus when two SATA bays are enough and you want dual 5GbE, three NVMe slots or a larger memory ceiling.
Winner by situation
Start with what you need it to do
I have four SATA drives to install
DS425+ has four matching bays. F2-425 Plus has two.
- Synology DiskStation DS425+
- Better fit
- TerraMaster F2-425 Plus N150 8GB
- Not suitable
I need three internal NVMe SSDs
TerraMaster provides three physical M.2 slots. Synology provides two.
- Synology DiskStation DS425+
- Not suitable
- TerraMaster F2-425 Plus N150 8GB
- Better fit
I want two native 5GbE connections
TerraMaster has two 5GbE ports. Synology has 2.5GbE and 1GbE.
- Synology DiskStation DS425+
- Not suitable
- TerraMaster F2-425 Plus N150 8GB
- Better fit
I need DSM for an established backup workflow
DS425+ retains DSM. Moving to TOS requires a check of the actual backup jobs and destinations.
- Synology DiskStation DS425+
- Better fit
- TerraMaster F2-425 Plus N150 8GB
- Depends
What matters in practice
The differences that matter
Two extra SATA bays change a four-disk plan
Four SATA disks fit DS425+ and exceed F2-425 Plus by two bays. Counting M.2 slots does not rescue that plan because the interfaces and drive formats differ.
How we reached this conclusion
4 required SATA drives - 2 TerraMaster SATA bays = 2 missing bays. Synology provides all four.
A two-NVMe installation leaves different expansion room
TerraMaster retains one M.2 slot after two SSDs are installed. Synology retains none, despite its larger SATA bay count.
How we reached this conclusion
TerraMaster: 3 - 2 = 1 spare M.2 slot. Synology: 2 - 2 = 0. Confirm the OS supports your intended SSD roles.
Memory headroom favors the smaller enclosure
A smaller SATA chassis does not mean a smaller RAM allowance. F2-425 Plus includes 8GB, which is already 2GB above DS425+'s official 6GB ceiling.
How we reached this conclusion
8GB included - 6GB maximum = 2GB. TerraMaster's separate 32GB limit gives additional room but does not prove faster applications.
Choice A
Synology, DS425+
Synology DiskStation DS425+
The chassis has 4-bay storage. Its fastest documented network path is 2.5 Gbps.
- Best matched use
- protect family photos and start with four drives
Checked facts
- SATA drive bays: Four
- M.2 NVMe slots: Two
- Native Ethernet: One 2.5GbE plus one 1GbE
- Included and maximum RAM: 2GB included, 6GB maximum
Choice B
TerraMaster, F2-425 Plus N150 8GB
F2-425 Plus N150 8GB
A compact hybrid NAS with two SATA bays, three M.2 slots and two 5GbE ports. It suits a small SSD workspace beside a bulk-storage mirror.
- Best matched use
- Two hard drives plus a separate SSD workspace
Checked facts
- SATA drive bays: Two
- M.2 NVMe slots: Three
- Native Ethernet: Two 5GbE
- Included and maximum RAM: 8GB included, 32GB maximum
Meaningful differences
What changes the fit
| What changes | Synology DiskStation DS425+ | TerraMaster F2-425 Plus N150 8GB | Why it matters |
|---|---|---|---|
| SATA drive bays | Four | Two | A four-hard-drive plan fits Synology. TerraMaster's third M.2 slot cannot accept another SATA hard drive. |
| M.2 NVMe slots | Two | Three | TerraMaster leaves an extra physical SSD position for a supported pool or cache plan. |
| Native Ethernet | One 2.5GbE plus one 1GbE | Two 5GbE | TerraMaster has the higher per-port ceiling and two matching fast ports. Link aggregation is a separate configuration. |
| Included and maximum RAM | 2GB included, 6GB maximum | 8GB included, 32GB maximum | TerraMaster starts with more memory than Synology's supported maximum. |
| Management platform | DSM | TOS | Check the exact application and migration workflow rather than treating these platforms as interchangeable. |
What you give up
Every choice has a cost
If you choose Synology DiskStation DS425+
- Its 6GB RAM ceiling and 2.5GbE fastest port are lower.
If you choose TerraMaster F2-425 Plus N150 8GB
- A DSM-based workflow needs an application and migration review.
Recommendation switch
The decision flips if...
You need four SATA hard drives inside the NAS
Choose Synology DiskStation DS425+. DS425+ supplies four SATA bays.
Two SATA bays suffice and you need three NVMe slots or dual 5GbE
Choose TerraMaster F2-425 Plus N150 8GB. F2-425 Plus supplies those SSD and network connections.
You need both four SATA drives and three NVMe drives
Choose neither. Neither enclosure has that exact combination of physical slots.
What matters in practice
How to make the call
Choose the drive format before counting slots
This is a four-SATA versus two-SATA choice with different SSD expansion. A spare M.2 slot cannot hold a 3.5-inch hard drive. Sketch the intended drives and supported storage pools before comparing maximum raw capacity claims.
A faster network has its own cost
TerraMaster's 5GbE ports are useful with matching adapters and switching. A 1GbE computer does not gain a 5GbE link by connecting through a faster NAS. Two native ports also do not guarantee that one file copy uses both simultaneously.
Treat the operating system as part of the hardware purchase
DSM and TOS have distinct applications, permissions and backup tools. A specific DSM dependency can justify Synology even when TerraMaster has more RAM. Conversely, a memory requirement above 6GB is outside the DS425+ specification and should be resolved before buying.
What this comparison cannot tell you
- No transfer-speed, application, noise or reliability measurements were performed. Physical slots do not establish every supported pool or cache combination.
What the facts say
What the comparison shows
Useful conclusions from the current NAS devices comparison, followed by the checked facts used to reach them.
See the checked facts and calculation notes
| Product | Needs matched | Checked facts | Source records |
|---|---|---|---|
| Synology DiskStation DS425+ |
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| |
| TerraMaster F2-425 Plus N150 8GB |
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Ready to choose?
Check the price. Read the owner reviews.
Open either model on Amazon to check the current price, customer reviews and delivery options.
Synology DiskStation DS425+
Install four SATA hard drives in one enclosure
See price & reviews on AmazonTerraMaster F2-425 Plus N150 8GB
Build around two SATA drives and three NVMe slots
See price & reviews on AmazonLinks open in a new tab.