Technical reference
TerraMaster F4-425 Pro N350 specifications
F4-425 Pro N350 · Intel N350 · 8-core · 16GB DDR5 · 3.5-inch SATA HDD / 2.5-inch SATA SSD / M.2 NVMe
Complete specifications with requirements, upgrade limits and sources. For our buying judgment, reviews and prices, return to the buying guide.
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Search all 68 specifications, including conditions and limits.
Identity
Compute and memory
Exact-model specifications with published conditions and limitations.
| Processor | Intel N350 · 8-core[1] |
|---|---|
| Factory memory | 16GB DDR5[1] Factory memory is kept separate from maximum supported capacity and from seller-installed upgrades. |
| Physical CPU cores | 8[2][3] |
| Factory memory | 16 GB[2][3] |
| Host memory ECC | No[2][3] |
| Official memory upgrade path | Yes — one SODIMM; N350 ships 16 GB; official maximum 32 GB non-ECC SODIMM, which requires replacing the installed module.[1] Evidence boundary: the opened exact-model official page did not publish or establish this field. The citation records the checked evidence boundary, not a confirmed feature. F4-425 Pro N350: evidence is still needed for an official path to add or replace memory; a connector alone does not establish that path. This remains unknown, not a confirmed no. |
| Official memory limit | 32 GB[2][3] |
Storage and expansion
Exact-model specifications with published conditions and limitations.
| Cataloged drive-bay count | 4[1] M.2 positions are listed separately and are not silently added to SATA bay count. |
|---|---|
| Supported drive layout | 3.5-inch SATA HDD / 2.5-inch SATA SSD / M.2 NVMe[1] |
| Replaceable storage drives | Yes[2][3] |
| M.2 expansion | Yes[2][3] |
| Official external drive enclosure expansion | Not verified[1] Evidence boundary: the opened exact-model official page did not publish or establish this field. The citation records the checked evidence boundary, not a confirmed feature. F4-425 Pro N350: evidence is still needed for an official external drive-enclosure expansion path; a USB port alone does not establish support. This remains unknown, not a confirmed no. |
| Physical M.2 slots | 3[2][3] |
| SATA without a mandatory model whitelist | Not verified[1] Evidence boundary: the opened exact-model official page did not publish or establish this field. The citation records the checked evidence boundary, not a confirmed feature. F4-425 Pro N350: evidence is still needed for the documented boundary of any mandatory manufacturer-model whitelist for SATA media; a compatibility list alone does not establish a technical lock. This remains unknown, not a confirmed no. |
| M.2 without a mandatory model whitelist | Not verified[1] Evidence boundary: the opened exact-model official page did not publish or establish this field. The citation records the checked evidence boundary, not a confirmed feature. F4-425 Pro N350: evidence is still needed for the documented boundary of any mandatory manufacturer-model whitelist for M.2 media; an omitted restriction does not establish unrestricted support. This remains unknown, not a confirmed no. |
Network
Exact-model specifications with published conditions and limitations.
| Installed Ethernet | 2 × 5GbE[1] Multiple ports do not guarantee one client the sum of their link rates. |
|---|---|
| Fastest installed single network port | 5 Gbps[2][3] |
| Official network upgrade path | No PCIe expansion slot is listed on the official F4-425 Pro specification panel; dual 5GbE is the installed networking.[1][10] Evidence boundary: the opened exact-model official page did not publish or establish this field. The citation records the checked evidence boundary, not a confirmed feature. F4-425 Pro N350: evidence is still needed for an official network upgrade path; an installed port does not by itself establish an upgrade path. This remains unknown, not a confirmed no. |
Software and data protection
Exact-model specifications with published conditions and limitations.
| Factory operating system | TOS; current product page advertises TOS 7[1] Exact shipping build and per-model update package not verified. Dated reviews identify their tested version separately. |
|---|---|
| Published storage and protection features | TRAID elastic storage; snapshot recovery; automated 3-2-1 backup; HyperLock WORM[1] These are current manufacturer claims on the exact shared variant page. Package, media, retention and administrator-control prerequisites must still be verified for the selected configuration. |
| RAID support | Yes[1] The opened exact-model page publishes TRAID storage and redundancy support. Available layouts still depend on the installed SATA/M.2 media and drive count. |
| Backup through the graphical interface | Duple Backup is listed; graphical TOS backup configuration documented[1] Manufacturer feature documentation; not an end-to-end independent workload or recovery test. |
| Backup to an independent target | Duple Backup supports independent backup destinations; configure and test the selected target[1] Manufacturer feature documentation; not an end-to-end independent workload or recovery test. |
| Documented restore path | TOS Duple Backup documents file restoration; full endpoint recovery is not established[1] Manufacturer feature documentation; not an end-to-end independent workload or recovery test. |
| Scheduled backup | Scheduled backup documented in TOS Duple Backup[1] Manufacturer feature documentation; not an end-to-end independent workload or recovery test. |
| Restore from snapshots | Shared-folder and LUN snapshots listed; check Btrfs, package and current model conditions[1] Manufacturer feature documentation; not an end-to-end independent workload or recovery test. |
| Version retention | Version retention documented for TOS backup jobs; verify the selected task mode[1] Manufacturer feature documentation; not an end-to-end independent workload or recovery test. |
| Immutable protection | HyperLock listed; administrator-deletion and retention-enforcement boundaries not independently verified[1] Manufacturer feature documentation; not an end-to-end independent workload or recovery test. |
| Remote snapshot replication | TOS Snapshot documents replication; confirm package/model/target support[1] Manufacturer feature documentation; not an end-to-end independent workload or recovery test. |
| Native endpoint restore | Full endpoint recovery not independently verified[1] File backup and restore do not establish bare-metal endpoint recovery. |
| Official system update path | Official TOS update path exists; exact package not verified[1] Blocked release pages do not prove that the model lacks updates. |
| System status interface | Resource Monitor listed in the exact-model feature table[1] Manufacturer feature documentation; not an end-to-end independent workload or recovery test. |
| System log interface | Syslog listed in the exact-model feature table[1] Manufacturer feature documentation; not an end-to-end independent workload or recovery test. |
Warranty and support
Exact-model specifications with published conditions and limitations.
| Standard warranty | 2 years[3] |
|---|
Physical, power and acoustics
Exact-model specifications with published conditions and limitations.
| Dimensions | 150 × 181 × 219 mm (H×W×D as labelled Size (H*W*D) 150*181*219 mm)[1] The cited exact-model page was checked but did not publish an applicable value. The citation records absence in the checked evidence, not a positive specification. |
|---|---|
| Weight | Net 2.9 kg; gross 4.1 kg[1] The cited exact-model page was checked but did not publish an applicable value. The citation records absence in the checked evidence, not a positive specification. |
| Power supply and consumption | 90 W external adapter; AC 100–240 V, 50/60 Hz. Page table does not list a separate wattage for loaded HDD read/write.[1] The cited exact-model page was checked but did not publish an applicable value. The citation records absence in the checked evidence, not a positive specification. |
| Acoustic conditions | 20.9 dB(A) using 4 SATA HDDs/SSDs in standby; test environment 17.3 dB(A); 1 m. Not a loaded-drive figure and not comparable to review-room impressions.[1] The cited exact-model page was checked but did not publish an applicable value. The citation records absence in the checked evidence, not a positive specification. |
F4-425 Pro Specification
Exact-model specifications with published conditions and limitations.
| Processor Model | Intel® N350 / Intel® N305 (this SKU is the N350 column)[1] |
|---|---|
| Processor Architecture | X.86 64-bit[1] |
| Processor Frequency | N350: max burst up to 3.9 GHz; N305: max burst up to 3.8 GHz[1] |
| Hardware Transcoding Engine | H.264, H.265, MPEG-4, VC-1; maximum resolution 4K (4096 × 2160); 60 fps[1] |
| System Memory | N350: 16 GB non-ECC SODIMM; N305: 8 GB non-ECC SODIMM[1] |
| Pre-installed Memory Module | N350: 16 GB non-ECC SODIMM (1×16 GB); N305: 8 GB (1×8 GB)[1] |
| Total Memory Slot Number | 1 (SODIMM)[1] |
| Maximum Supported Memory | 32 GB non-ECC SODIMM[1] |
| Disk Slot Number | 4[1] |
| Compatible Drive types | 3.5" SATA HDD; 2.5" SATA HDD; 2.5" SATA SSD[1] |
| Maximum Internal Raw Storage Capacity | 120 TB (30 TB × 4); capacity may vary by RAID type[1] |
| M.2 2280 NVMe Slot | 3 (PCIe 3.0 x1)[1] |
| Drive Hot Swap | √ (SATA trays; M.2 requires removing the outer shell)[1] |
| Internal Drive file systems | Btrfs, EXT4[1] |
| External Drive file systems | EXT3, EXT4, NTFS, FAT32, HFS+, BTRFS[1] |
| RJ-45 5GbE Network Port | 2[1] |
| USB3.2 Host Port Type A | 3 (10 Gbps)[1] |
| USB3.2 Host Port Type C | 1 (10 Gbps)[1] |
| HDMI | 1 × HDMI[1] |
| Size (H*W*D) | 150*181*219 mm[1] |
| Packaging Size (H*W*D) | 186*277*277 mm[1] |
| System Fan | 120 × 120 × 25 mm, 1 pc[1] |
| Fan Mode | Smart, High speed, Middle speed, Low speed[1] |
| Limited warranty (storefront) | 2 years — stated on the manufacturer storefront, not as a separate PDF warranty table on this page[1] |
| Redundancy Power Supply | No redundant power supply listed[1] |
| AC Input Voltage | 100–240 V AC[1] |
| Current Frequency | 50/60 Hz[1] |
Exact product identity & open questions
- Product ID
- terramaster-f4-425-pro-n350[1]
- Exact MPN or manufacturer configuration ID
- F4-425 Pro N350[1]
- Model
- F4-425 Pro N350[1]
- Factory compute and memory
- Intel N350 · 8-core; 16GB DDR5[1]
- Storage layout
- 3.5-inch SATA HDD / 2.5-inch SATA SSD / M.2 NVMe[1]
- Exact shipping build and update package: Current TOS 7 marketing is verified; a per-model shipping build and downloadable package mapping were not.
- Full restore and heavy application capacity: No controlled end-to-end endpoint restore drill, heavy VM-concurrency test or standardized simultaneous transcoding test was retained.
- Storage compatibility enforcement: Compatibility guidance does not by itself establish whether every unlisted drive is accepted. Check exact media and current TOS support.
- Four-HDD RAID performance: The retained timed storage reviews use SSDs. Four-HDD throughput, power and rebuild behavior remain unverified.
Sources
Research updated Sep 11, 2026. Individual source check dates are listed below. Measurements belong to the named reviewers; tested configurations and software versions may differ from the product you buy.
- [1] TerraMaster F4-425 Pro N350 official product page ↗
Checked Sep 10, 2026 · Exact model page, hardware description, configuration selector and current feature sections
- [2] variant ↗
Checked Sep 10, 2026 · product.variants[id=46428396421154] → title / sku / options
- [3] terramaster-f4-425-pro-n350 ↗
Checked Sep 10, 2026 · terramaster-f4-425-pro-n350: normalized text lines 190–250; terramaster-f4-425-pro-n350: normalized text lines 344–344; TM Support official first post 2026-08-04; exact product TOS7/CPU statement; F4-425 Pro official page, normalized text lines 103–108 (8-core / 16GB / dual 5GbE); exact N350 variant and model-specific memory matrix linked separately
- [4] tos7-x86-release ↗
Checked Sep 8, 2026 · TM Support official first post 2026-08-04; exact product TOS7/CPU statement
- [5] TOS7 Duple Backup ↗
Checked Sep 10, 2026 · Duple Backup → How to Create a Backup Task / Multi-Version Mode / Restore
- [6] TOS7 Snapshot ↗
Checked Sep 10, 2026 · Snapshot → Requirements / Schedules / Retention / Duplicate / Restore
- [7] TOS7 Device Monitoring ↗
Checked Sep 10, 2026 · Device Monitoring → Overview / Resource Usage
- [8] TOS7 System Logs ↗
Checked Sep 10, 2026 · System Logs → introduction / Management and Operations
- [9] Notebookcheck original test of F4-425 Pro N350 ↗
Checked Sep 10, 2026 · Test configuration, practical observations, benchmark discussion and conclusion
- [10] TechRadar original test of F4-425 Pro N350 ↗
Checked Sep 10, 2026 · Test configuration, practical observations, benchmark discussion and conclusion
- [11] TerraMaster first-party variant data for F4-425 Pro N350 ↗
Checked Sep 10, 2026 · First-party variant endpoint; variant 46428396421154; N350 / Silver; SKU not published; available=true; price and selection data only
- [12] TerraMaster exact selected product page for F4-425 Pro N350 ↗
Checked Sep 10, 2026 · Exact selected PDP URL for variant 46428396421154. The base PDP was opened successfully on 2026-09-10T01:13:31.933Z; SKU, price and availability came from first-party endpoint https://www.terra-master.com/products/f4-425-pro.js at 2026-09-10T01:13:21.680Z. The query-specific PDP was not represented as a separate fetch.
- [13] TerraMaster F4-425 Pro NAS review — Macworld ↗
Checked Sep 11, 2026 · Full article and Blackmagic/Amorphous/ATTO figures; no 450 GB result in this original.
- [14] TerraMaster F4-425 Pro NAS review — How-To Geek ↗
Checked Sep 11, 2026 · Hands-on chassis/TOS 7; SKU (N305 vs N350) not isolated as the tested unit
- [15] Newegg TERRAMASTER F4-425 Pro N350 ↗
Checked Sep 11, 2026 · Buy box: $639.99, Sold by TERRAMASTER OFFICIAL, Shipped by Newegg, Add to cart, model F4-425 Pro-N350 selected
- [16] TerraMaster Compatibility Guide ↗
Checked Sep 11, 2026 · Manufacturer compatibility landing page; not a proof of an empty whitelist
- [17] HWBusters — TerraMaster F4-425 Pro N350 NAS Buying Guide ↗
Checked Sep 11, 2026 · Full original article and separately documented benchmark figures
Research and review record
- Research: Grok 4.6 · Source research and data update
- Self-check: Grok 4.6 · Researcher self-check
- Independent review: GPT-6 (Codex) · Independent full available original text/table review and named chart inspection, exact model/table/offer reconciliation and evidence attribution; unviewed video and blocked sources explicitly excluded.
- Editorial integration: GPT-6 (Codex) · Editorial integration and validation
Independent review completed for the scope recorded in the audit.
Source evidence and review history (JSON)