Compact 4-bay private-cloud NAS
Synology DiskStation DS425+ 4-Bay Diskless NAS
The Synology DiskStation DS425+ is a compact four-bay NAS with an Intel Celeron J4125 processor, 2 GB DDR4 memory, one 2.5GbE port, one 1GbE port and two M.2 NVMe slots.
- Processor
- Intel Celeron J4125
- Memory
- 2 GB DDR4 non-ECC
- Storage
- 4 bays + 2 M.2 slots
- Networking
- 1 × 2.5GbE + 1 × 1GbE
Four-bay storage for files, backups and private collaboration
The Synology DiskStation DS425+ provides four SATA bays for greater storage flexibility than a two-bay system while keeping a compact desktop form. DSM applications support private file access, backup, photo organisation, multi-site synchronisation and surveillance, with M.2 NVMe options for compatible cache or storage-pool deployments.
Four-bay flexibility
Four SATA bays provide more capacity and RAID-planning options than a two-bay enclosure.
Built-in 2.5GbE
A 2.5GbE port supports faster transfers alongside the separate 1GbE connection.
M.2 NVMe slots
Two M.2 2280 slots support compatible SSD cache or storage-pool configurations.
Upgradeable memory
The installed 2 GB can be expanded to a stated maximum of 6 GB.
Private collaboration
DSM supports controlled file access, sharing and synchronisation across users and sites.
Surveillance option
Synology positions the model for management of up to 40 IP cameras, subject to licensing and configuration.
Who is the Synology DiskStation DS425+ best for?
A strong choice for
- Home offices needing four drive bays
- Small-team file sharing
- Private photo and document storage
- PC and server backup
- Mixed 1GbE and 2.5GbE networks
- Supported surveillance deployments
Consider another model if you need
- You require chassis expansion beyond four bays
- You need memory beyond 6 GB
- You need dual 2.5GbE ports
- You require PCIe network-card expansion
Key specifications
- CPU
- Intel Celeron J4125, 4-core
- Memory
- 2 GB DDR4 non-ECC
- Maximum memory
- 6 GB
- Drive bays
- 4
- M.2 slots
- 2 × M.2 2280 NVMe
- Networking
- 1 × 2.5GbE + 1 × 1GbE
- USB
- 2 × USB 3.2 Gen 1
- Dimensions
- 166 × 199 × 223 mm
- Weight
- 2.18 kg
- Warranty
- 3 years, extendable to 5 years
Full technical specifications
Processor, memory and storage
| CPU model | Intel Celeron J4125 |
|---|---|
| CPU quantity | 1 |
| CPU cores | 4 |
| CPU threads | 4 |
| CPU architecture | 64-bit |
| CPU frequency | 2.0 GHz base / 2.7 GHz turbo |
| Hardware encryption engine | Supported |
| System memory | 2 GB DDR4 non-ECC |
| Memory slots | 1 |
| Maximum memory capacity | 6 GB (2 GB + 4 GB) |
| Drive bays | 4 × 3.5-inch SATA HDD or 2.5-inch SATA SSD |
| Maximum raw capacity guidance | Up to 96 TB raw using 24 TB drives |
| M.2 drive slots | 2 × M.2 2280 NVMe |
| Supported drive types | 3.5-inch SATA HDD, 2.5-inch SATA SSD and M.2 2280 NVMe SSD |
| Hot-swappable SATA drives | Supported |
| M.2 hot swap | Not supported |
Network, ports and expansion
| 1GbE RJ-45 ports | 1 |
|---|---|
| 2.5GbE RJ-45 ports | 1 |
| USB 3.2 Gen 1 ports | 2 |
| 1GbE maximum MTU | 1,500 bytes |
Physical, power and environment
| Dimensions (H × W × D) | 166 × 199 × 223 mm |
|---|---|
| Weight | 2.18 kg |
| System fan | 92 × 92 mm × 2 |
| Fan modes | Full-Speed, Cool and Quiet |
| Adjustable front LED brightness | Supported |
| Power recovery | Supported |
| Scheduled power on/off | Supported |
| Wake on LAN/WAN | Supported |
| Noise level | 21.6 dB(A) |
| Power supply / adapter | 90 W |
| AC input | 100V to 240V AC |
| Power frequency | 50/60 Hz, single phase |
| Power consumption — access | 28.25 W |
| Power consumption — HDD hibernation | 6.10 W |
| British thermal unit — access | 96.33 BTU/hr |
| British thermal unit — HDD hibernation | 20.79 BTU/hr |
| Operating temperature | 0°C to 40°C (32°F to 104°F) |
| Storage temperature | -20°C to 60°C (-5°F to 140°F) |
| Operating humidity | 8% to 80% RH |
| Storage humidity | 5% to 95% RH |
Warranty, compliance and package contents
| Warranty | 3-year hardware warranty, extendable to 5 years with EW201 or Extended Warranty Plus |
|---|---|
| Environmental compliance | RoHS compliant |
| Certifications | FCC, CE, BSMI, VCCI, RCM, UKCA, EAC, CCC, KC and BIS |
| Package contents | Main unit × 1, accessory pack × 1, AC power adapter × 1, AC power cord × 1 and RJ-45 LAN cable × 2 |
Frequently asked questions about the Synology DiskStation DS425+
What is the Synology DiskStation DS425+?
It is a compact four-bay diskless NAS for private storage, backup, sharing and supported surveillance.
Which processor does the DS425+ use?
The DS425+ uses a four-core Intel Celeron J4125 running at 2.0 GHz with turbo frequency up to 2.7 GHz.
How much memory is installed in the DS425+?
It includes 2 GB DDR4 non-ECC memory and supports up to 6 GB total.
How many SATA drive bays does the DS425+ have?
It has four bays for compatible 3.5-inch SATA HDDs or 2.5-inch SATA SSDs.
Does the DS425+ have M.2 slots?
Yes. It has two M.2 2280 NVMe slots for compatible SSD cache or storage-pool use.
What network ports are included on the DS425+?
It includes one 2.5GbE RJ-45 port and one 1GbE RJ-45 port.
What transfer performance is stated for the DS425+?
Synology states up to 278 MB/s read and 281 MB/s write in its test configuration.
Are drives included with the DS425+?
No. It is supplied diskless, so compatible SATA and M.2 drives are sold separately.
What are the DS425+ dimensions?
It measures 166 × 199 × 223 mm and weighs 2.18 kg without drives.
What warranty applies to the DS425+?
It includes a three-year hardware warranty, extendable to five years through eligible Synology options.
- This listing is diskless; compatible drives are sold separately.
- The 96 TB raw figure is calculated with four 24 TB drives; usable capacity depends on RAID and configuration.
- M.2 hot swap is not supported, and exact SSD functions depend on current compatibility.
- Performance and camera figures are based on Synology test or planning conditions.
