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Technical reference

TerraMaster F4-425 specifications

Diskless F4-425; factory 4GB DDR4; not the Plus or Pro model.

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 131 specifications, including conditions and limits.

CPU

Exact-model specifications with published conditions and limitations.

CPU specifications
Processor ModelIntel Celeron N5095[1]
Processor Architecturex86 64-bit[1]
Processor Frequency4 cores; 2.0GHz base, up to 2.9GHz burst[1]
Hardware Encryption EngineSupported[1]
Hardware Transcoding EngineH.264, H.265, MPEG-4, VC-1; up to 4096 × 2160 at 60fps[1]

Hardware capability; actual codecs, simultaneous streams and application licenses depend on the player and software.

CPU Single-Core ScoreNot published[1]

PDF prints /; this is not zero.

Memory

Exact-model specifications with published conditions and limitations.

Memory specifications
System Memory4GB DDR4 non-ECC SODIMM[1]

A larger module replaces the supplied one. Vendor may substitute equivalent verified modules; maximum is not factory memory.

Pre-installed Memory Module1 × 4GB[1]

A larger module replaces the supplied one. Vendor may substitute equivalent verified modules; maximum is not factory memory.

Total Memory Slot Number1 DDR4 SODIMM slot[1]

A larger module replaces the supplied one. Vendor may substitute equivalent verified modules; maximum is not factory memory.

Maximum Supported Memory16GB DDR4 non-ECC SODIMM[1]

A larger module replaces the supplied one. Vendor may substitute equivalent verified modules; maximum is not factory memory.

Memory module substitution policyManufacturer may substitute modules of equal or higher frequency after compatibility and stability validation[1]

Full PDF note.

Storage

Exact-model specifications with published conditions and limitations.

Storage specifications
Disk Slot Number4[1]

Drives are separate. Raw capacity differs from usable RAID capacity; newer supported drives may change this figure.

Compatible Drive types3.5-inch SATA HDD; 2.5-inch SATA HDD/SSD[1]

Drives are separate. Raw capacity differs from usable RAID capacity; newer supported drives may change this figure.

Maximum Internal Raw Storage Capacity120TB: 4 × 30TB[1]

Drives are separate. Raw capacity differs from usable RAID capacity; newer supported drives may change this figure.

Drive Hot SwapSupported[1]

Drives are separate. Raw capacity differs from usable RAID capacity; newer supported drives may change this figure.

File System

Exact-model specifications with published conditions and limitations.

File System specifications
Internal DriveBtrfs, EXT4[1]
External DriveEXT3, EXT4, NTFS, FAT32, HFS+, Btrfs[1]

External Ports

Exact-model specifications with published conditions and limitations.

External Ports specifications
RJ-45 2.5GbE Network Port1[1]
USB3.2 Host Port2 × 10Gbps + 1 × 5Gbps USB-A[1]
HDMI1 HDMI port[1]

Appearance

Exact-model specifications with published conditions and limitations.

Appearance specifications
Size (H×W×D)222 × 179 × 154mm, as labelled by manufacturer[1]
Packaging Size300 × 275 × 186mm[1]
Weight2.1kg net; 3.2kg gross[1]

Others

Exact-model specifications with published conditions and limitations.

Others specifications
System Fan1 × 120 × 120 × 25mm[1]
Fan ModeSmart, high, medium, low[1]
Noise Level21.0dB(A)[1]

Manufacturer test: two SATA HDDs/SSDs in standby, background 17.3dB(A), distance 1m. Not a loaded four-HDD acoustic measurement.

Power Supply90W adapter[1]
Redundant Power SupplyNot provided[1]
AC Input100–240V AC; 50/60Hz[1]
Power Consumption33W read/write; 13W hibernation[1]

Manufacturer measurement fully populated with Seagate ST4000VN008 4TB drives. Hibernation is not ordinary idle; power-adapter rating is different.

Warranty

Exact-model specifications with published conditions and limitations.

Warranty specifications
Limited warranty2 years[1]

Compliance

Exact-model specifications with published conditions and limitations.

Compliance specifications
CertificateFCC, CE, CCC, KC[1]
EnvironmentRoHS, WEEE[1]

Temperature

Exact-model specifications with published conditions and limitations.

Temperature specifications
Working Temperature0–40°C[1]
Storage Temperature−20–60°C[1]

The official −5°F lower bound is a conversion typo: −20°C is −4°F.

Relative Humidity5–95% RH[1]

Package

Exact-model specifications with published conditions and limitations.

Package specifications
In the boxHost, power cord, power adapter, network cable, installation guide, warranty note and screws[1]

Client Support

Exact-model specifications with published conditions and limitations.

Client Support specifications
Client OSWindows, macOS, Linux[1]

Vendor compatibility listing, not a recommendation to use obsolete software.

Web BrowsersChrome 97+, Firefox 9.3, Safari 12.1, Edge 99+ (vendor-listed versions)[1]

Vendor compatibility listing, not a recommendation to use obsolete software.

Mobile OSiOS 14+, Android 10+[1]

Vendor compatibility listing, not a recommendation to use obsolete software.

Storage Management

Exact-model specifications with published conditions and limitations.

Storage Management specifications
Supported RAID TypesTRAID, TRAID+, Single, JBOD, RAID 0/1/5/6/10[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

Maximum Internal Volume Number128[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

Maximum iSCSI Targets64[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

Maximum iSCSI LUNs64[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

Volume Expansion with Larger HDDsTRAID, TRAID+, RAID 5/6/10[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

Volume Expansion by Adding a HDDNot confirmed: specification PDF marks this row unavailable[1]

Current marketing describes elastic TRAID expansion, while the PDF marks this specific row with a slash. Confirm the exact array workflow before planning incremental disk additions.

RAID MigrationSupported[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

SSD CacheSupported through compatible SATA SSDs[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

Hot SpareSupported[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

SSD TRIMSupported[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

Hard Drive S.M.A.R.T.Supported[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

Seagate IHMSupported[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

NVRAM write cache (BBU protected)Not provided[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

Shared Folder SnapshotSupported[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

LUN SnapshotSupported[1]

Software capabilities depend on filesystem, drive layout and TOS version. Numeric limits are ceilings, not simultaneous workload measurements.

File Services

Exact-model specifications with published conditions and limitations.

File Services specifications
File ProtocolSMB, AFP, NFS, FTP, SFTP, WebDAV[1]
Maximum Concurrent SMB/AFP/FTP/SFTP Connections100[1]
Windows ACL IntegrationSupported[1]
NFS Kerberos AuthenticationSupported[1]

Accounts

Exact-model specifications with published conditions and limitations.

Accounts specifications
Maximum local accounts128[1]

Vendor software limits; not a concurrent-user performance promise.

Maximum local groups128[1]

Vendor software limits; not a concurrent-user performance promise.

Maximum shared folders128[1]

Vendor software limits; not a concurrent-user performance promise.

Maximum shared-folder syncing tasks8[1]

Vendor software limits; not a concurrent-user performance promise.

Backup

Exact-model specifications with published conditions and limitations.

Backup specifications
Rsync BackupSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Duple BackupSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Centralized BackupSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

SnapshotSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

USB BackupSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Cloud SyncSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Time Machine BackupSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

File System SnapshotSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

TFM BackupSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Networking

Exact-model specifications with published conditions and limitations.

Networking specifications
Link AggregationGeneric software checkmark; only one physical Ethernet port[1]

No usable two-port bond is established by this row.

DLNASupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

VPN ClientSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

VPN ServerSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Proxy ClientSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

UPnP/Bonjour DiscoverySupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

TNAS.online Remote AccessSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

DDNSSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

TCP/IPIPv4, IPv6[1]
ProtocolsCIFS/SMB, NFS, FTP, SFTP, HTTPS, SSH, iSCSI, SNMP[1]
Proxy ServerNot listed as supported[1]

Access Rights

Exact-model specifications with published conditions and limitations.

Access Rights specifications
Import/Export usersSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

User Quota ManagementSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Local user access control for SMB and FTPSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Batch user creationNot listed as supported[1]

Domain Authentication

Exact-model specifications with published conditions and limitations.

Domain Authentication specifications
AD DomainSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

LDAP ClientSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

LDAP ServerNot listed as supported[1]

Security

Exact-model specifications with published conditions and limitations.

Security specifications
Firewall ProtectionSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Account Auto-block ProtectionSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

AES Shared Folder EncryptionSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Importable SSL certificateSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Email / desktop / beep alertsSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

RSA 2048 Encryption (TOS 6.0)Supported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

PAMSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

OTP Authentication (TOS 6.0)Supported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

HyperLock File System (TOS 6.0)Supported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Power Management

Exact-model specifications with published conditions and limitations.

Power Management specifications
Power ResumeSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Scheduled Power On/OffSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Wake on LANSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

UPS SupportSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Administration

Exact-model specifications with published conditions and limitations.

Administration specifications
Multi-window / multi-task managementSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Custom DesktopSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Control PanelSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Resource MonitorSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

SyslogSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

OS UI LanguageEnglish, German, French, Spanish, Italian, Magyar, Chinese, Japanese, Korean, Turkish, Portuguese, Russian[1]

Applications

Exact-model specifications with published conditions and limitations.

Applications specifications
Application CenterSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

iSCSI TargetSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Terra PhotosSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

TerraSyncSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Duple BackupSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

CloudSyncSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Centralized BackupSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

USB BackupSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

VPN ServerSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

TransmissionSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

qBittorrentSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Aria2Supported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Surveillance ManagerSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

DeduplicationSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Web ServerSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Clam AntivirusSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

EmbySupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Multimedia ServerSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Plex Media ServerSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Docker ManagerSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

SnapshotSupported[1]

Application availability and required setup depend on TOS version; third-party services and premium features may have separate fees.

Expansion

Exact-model specifications with published conditions and limitations.

Expansion specifications
M.2 / PCIe expansionNo M.2 slots or network-card expansion slot[3]

SSD caching uses SATA bay capacity.

Exact product identity & open questions

Manufacturer / exact MPN
TerraMaster / F4-425[1]
Configuration covered
Diskless; factory 4GB DDR4; non-Plus, non-Pro model[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.

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. [1] TerraMaster F4-425 complete specification PDF ↗

    Checked Sep 10, 2026 · All four pages: hardware, TOS features and footnotes

  2. [2] TerraMaster F4-425 US product page ↗

    Checked Sep 10, 2026 · Hardware specification, software overview and US buy box

  3. [3] NASCompares F4-425 hardware limitations ↗

    Checked Sep 8, 2026 · NVMe, network and HDMI limitations; used as analysis, not an original benchmark

  4. [4] EnosTech original F4-425 review ↗

    Checked Sep 10, 2026 · Setup, configuration and original-use sections

  5. [5] Wired Italia original F4-425 review ↗

    Checked Sep 10, 2026 · Setup, configuration and original-use sections

  6. [6] Ultimate Technology Reviews original F4-425 review ↗

    Checked Sep 10, 2026 · Setup, configuration and original-use sections

  7. [7] TerraMaster F4-425 new enclosure offer ↗

    Checked Sep 10, 2026 · Exact model, factory memory and regular new buy box

  8. [8] B&H Photo Video F4-425 new enclosure offer ↗

    Checked Sep 8, 2026 · Exact model, factory memory and regular new buy box

  9. [9] Newegg F4-425 new enclosure offer ↗

    Checked Sep 10, 2026 · Exact model, factory memory and regular new buy box

  10. [10] Amazon F4-425 new enclosure offer ↗

    Checked Sep 10, 2026 · Exact model, factory memory and regular new buy box

  11. [11] TOS 7 Duple Backup ↗

    Checked Sep 11, 2026 · TOS 7 OS help; not a model firmware listing

  12. [12] TOS 7 Snapshot ↗

    Checked Sep 11, 2026 · Btrfs snapshot restore

  13. [13] Irish Examiner F4-425 review ↗

    Checked Sep 11, 2026 · Opened; little original measurement in the saved extract

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)

How we research products·Affiliate disclosure