Main trade-off
Synology DiskStation DS225+
There are no M.2 slots.
Head-to-head
Synology DiskStation DS225+ vs TerraMaster F2-425: Keep a DSM photo workflow or start with more supplied RAM
The short answer
The DS225+ fits buyers who want Synology Photos, backups and Surveillance Station in DSM. The F2-425 offers 4GB supplied memory for a TOS storage setup.
Before you choose
The reasoning and the trade-offs
Protected capacity with equal 12TB drives
Synology DiskStation DS225+ gives 12TB and F2-425 gives 12TB before formatting in this example. Changing chassis does not increase this protected capacity.
What this is based on
Assume every SATA bay contains a supported 12TB disk. Two-bay RAID 1 uses one disk of usable capacity. For three or more drives, RAID 5 usable TB = (drive count minus 1) × 12. This is an illustrative layout, not included storage or a backup.
Main trade-off
TerraMaster F2-425
Two SATA bays leave no room to add a third data drive to the same chassis.
Synology DiskStation DS225+
- Choose it for
- You want DSM photo, backup or camera applications
- You want 6GB for supported ram ceiling
- Main trade-off
- There are no M.2 slots.
TerraMaster F2-425
- Choose it for
- You want 4GB supplied RAM and a 16GB upgrade ceiling
- You want 16GB for supported ram ceiling
- Main trade-off
- Two SATA bays leave no room to add a third data drive to the same chassis.
About this comparison
Compare DS225+ and F2-425 by protected storage, included networking and the exact SSD or application layout you need.
Choose DSM features or extra supplied memory for a two-drive archive.
Winner by situation
Start with what you need it to do
A protected archive using 12 TB disks in every internal SATA bay
Using RAID 1 for two disks or RAID 5 for three or more disks, Synology DiskStation DS225+ gives 12TB and F2-425 gives 12TB before formatting in this example. Changing chassis does not increase this protected capacity.
- Synology DiskStation DS225+
- Similar
- TerraMaster F2-425
- Similar
A workstation already matching the faster included Ethernet port
Included port rates are 2.5GbE and 2.5GbE. Use the 100GB calculation alongside the actual client speed.
- Synology DiskStation DS225+
- Similar
- TerraMaster F2-425
- Similar
Several local services sharing the supplied RAM
Synology DiskStation DS225+ supplies 2 GB RAM and supports 6 GB. TerraMaster F2-425 supplies 4 GB and supports 16 GB. Compare the stated application memory requirement with the supplied configuration before budgeting for an upgrade. RAM capacity alone does not establish application speed.
- Synology DiskStation DS225+
- Depends
- TerraMaster F2-425
- Better fit
The supplied-memory gap survives the upgrade check
The F2-425 starts with 2GB more RAM and has a 10GB higher supported ceiling. The DS225+ case rests on required DSM applications, rather than a larger memory budget.
- Synology DiskStation DS225+
- Depends
- TerraMaster F2-425
- Depends
What matters in practice
The differences that matter
Protected capacity with equal 12TB drives
Synology DiskStation DS225+ gives 12TB and F2-425 gives 12TB before formatting in this example. Changing chassis does not increase this protected capacity.
How we reached this conclusion
Assume every SATA bay contains a supported 12TB disk. Two-bay RAID 1 uses one disk of usable capacity. For three or more drives, RAID 5 usable TB = (drive count minus 1) × 12. This is an illustrative layout, not included storage or a backup.
100GB transfer at the included port ceiling
The line-rate lower bound is 320 seconds for Synology DiskStation DS225+ and 320 seconds for F2-425. Real copies take longer. A 1GbE client makes the lower bound 800 seconds for both.
How we reached this conclusion
Decimal 100GB × 8 = 800 gigabits. Divide 800 by the fastest included port rate, 2.5Gbps or 2.5Gbps. Ignore protocol overhead only for this lower-bound calculation. Optional adapters and aggregated ports are excluded.
The supplied-memory gap survives the upgrade check
The F2-425 starts with 2GB more RAM and has a 10GB higher supported ceiling. The DS225+ case rests on required DSM applications, rather than a larger memory budget.
How we reached this conclusion
Installed gap = 4 minus 2 = 2GB. Manufacturer ceiling gap = 16 minus 6 = 10GB. No VM or application-count claim is inferred.
Choice A
Synology, DS225+
Synology DiskStation DS225+
The chassis has 2-bay storage. Its fastest documented network path is 2.5 Gbps.
- Best matched use
- protect family photos and start with two drives
Checked facts
- The chassis has 2-bay storage.
- Its fastest documented network path is 2.5 Gbps.
- Plex media serving is supported.
- Camera recording is supported, but the licensed channel count depends on the selected software and plan.
Choice B
TerraMaster, F2-425
F2-425
A two-drive photo and backup server with 2.5GbE and 4GB memory. Choose this chassis when a mirrored pair is enough and M.2 storage is unnecessary.
- Best matched use
- A modest two-drive home archive
Checked facts
- 2 SATA drive bays and 0 M.2 slots
- 2.5GbE fastest included network port
- 4GB supplied RAM, expandable to 16GB
- Diskless NAS with Intel x86 quad-core processor
Meaningful differences
What changes the fit
| What changes | Synology DiskStation DS225+ | TerraMaster F2-425 | Why it matters |
|---|---|---|---|
| Supplied RAM | 2GB | 4GB | This is the installed memory budget before purchasing upgrade modules. |
| Supported RAM ceiling | 6GB | 16GB | This sets the manufacturer-supported upgrade ceiling for concurrent services. |
| Processor | Intel Celeron J4125 | Intel x86 quad-core | Media engines, application architecture and concurrency depend on this platform. |
| Software and expansion route | DSM | TOS | Choose the applications and supported add-ons required for the job. |
What you give up
Every choice has a cost
If you choose Synology DiskStation DS225+
- Disk compatibility should be checked before purchase.
If you choose TerraMaster F2-425
- There are no M.2 slots. Storage drives are purchased separately.
Recommendation switch
The decision flips if...
You want DSM photo, backup or camera applications
Choose Synology DiskStation DS225+. Choose DS225+ when a confirmed DSM application is the requirement. Its 2 GB supplied memory and 6 GB supported ceiling remain separate limits to check.
You want 4GB supplied RAM and a 16GB upgrade ceiling
Choose TerraMaster F2-425. F2-425 supplies 4 GB and supports 16 GB, compared with 2 GB and 6 GB for DS225+. That gives a larger supported memory budget for compatible applications.
What matters in practice
How to make the call
Start with the required storage layout
The DS225+ fits buyers who want Synology Photos, backups and Surveillance Station in DSM. The F2-425 offers 4GB supplied memory for a TOS storage setup.
Work through the drive budget
A 12TB mirror stays 12TB before formatting in either chassis. Neither adds capacity by adding a third SATA drive, which makes the first drive-size choice important.
Check the actual client and application plan
The DS225+ starts at 2GB and officially expands to 6GB. The F2-425 starts at 4GB and supports 16GB. Compare the applications you will actually run, including any camera licenses, before valuing that RAM gap.
What this comparison cannot tell you
- Capacity examples use equal 12TB drives before formatting, snapshots and filesystem overhead.
- Ethernet calculations are lower bounds. Disk performance, network protocol and other traffic add time.
- Memory capacity does not certify application speed or a VM count.
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.
Compared set
Only 10 of 32 models checked match every need here: “Start with two drives” and “Survive one drive failure”.
10 matching models from 32 checkedSee the checked facts and calculation notes
Match countThe count uses the current product-to-need assignments for “Start with two drives” and “Survive one drive failure”. A need with no documented match does not count.
| Product | Needs matched | Checked facts | Source records |
|---|---|---|---|
| Synology DiskStation DS225+ |
|
| |
| TerraMaster F2-425 |
|
|
|
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 DS225+
You want DSM photo, backup or camera applications
See price & reviews on AmazonTerraMaster F2-425
You want 4GB supplied RAM and a 16GB upgrade ceiling
See price & reviews on AmazonLinks open in a new tab.