Synology DS425+ 4-Bay 2.5GbE Desktop NAS

At a Glance

• Compact 4-bay NAS for centralised private storage
• Intel Celeron quad-core processor
• 2GB DDR4 memory, expandable to 6GB
• Built-in 2.5GbE + 1GbE networking
• Two M.2 NVMe slots for SSD cache
• Four hot-swappable SATA drive bays
• Ideal for file storage, backup and surveillance
• 3-Year Synology Hardware Warranty

Important: Storage drives are not included.

Short Description

The Synology DS425+ is a compact 4-bay NAS designed for users who want centralised private storage for business files, backups, photos, media and surveillance without needing a larger enterprise system.

With 2.5GbE networking, four main drive bays and two M.2 NVMe cache slots, it provides a practical balance of capacity, performance and easy day-to-day data management.

Why Choose This Synology

Four Bays for Greater Storage Flexibility

Four main drive bays allow more flexible RAID, capacity and redundancy options than a typical two-bay NAS.

2.5GbE Networking Built In

A 2.5GbE port provides faster network connectivity for file transfers and backups, while an additional 1GbE port provides extra network flexibility.

Add SSD Cache Without Using Main Bays

Two dedicated M.2 NVMe slots support compatible Synology SSDs for cache acceleration while leaving all four SATA bays available for primary storage.

Simple Private Data Management

Synology DSM provides one central platform for managing files, backups, photos, synchronisation and surveillance.

A Strong Fit for Stable Storage Needs

The fixed four-bay design is well suited to customers who know their required storage capacity and do not need an external expansion chassis.

Best For

• Small businesses
• Home offices
• Centralised family or company files
• Computer and device backup
• Photo and media libraries
• Surveillance recording
• Private cloud storage
• Users wanting a compact four-bay NAS

Product Description

The Synology DiskStation DS425+ is a compact 4-bay storage solution designed for centralising and protecting important digital data.

Its Intel Celeron J4125 processor provides 4 cores with a 2.0GHz base frequency and turbo frequency up to 2.7GHz.

The system includes 2GB DDR4 non-ECC memory and supports expansion to a maximum of 6GB with the compatible Synology memory module.

Four hot-swappable bays support compatible 3.5-inch SATA HDDs and 2.5-inch SATA SSDs. Two M.2 2280 NVMe slots allow compatible Synology NVMe SSDs to be added for SSD cache acceleration.

Networking includes one 2.5GbE RJ-45 port and one 1GbE port, providing faster-than-Gigabit connectivity for supported workloads.

Synology DiskStation Manager provides tools for file sharing, backup, photo management, surveillance and storage protection from one central interface.

Storage drives are sold separately.

Key Features

• 4-bay desktop NAS
• Intel Celeron J4125 processor
• 2GB DDR4 memory
• Expandable to 6GB
• Built-in 2.5GbE + 1GbE
• Two M.2 NVMe cache slots
• Four hot-swappable SATA bays
• SSD read/write cache support
• Synology Hybrid RAID
• Btrfs file system
• Synology DSM
• 3-year warranty

What Do I Need With This NAS?

Required

• Compatible storage drives

Optional Upgrades

• D4NS01-4G memory module
• Compatible M.2 NVMe SSDs for cache
• Additional Surveillance Station licences

The DS425+ has a fixed four-bay design and does not support an external storage expansion unit.

Compatible Storage

Plus Series 3.5-inch SATA HDD

• HAT3300-4T
• HAT3300-6T
• HAT3320-8T
• HAT3310-12T
• HAT3310-16T
• HAT3320-20T

Enterprise 3.5-inch SATA HDD

• HAT5320-4T
• HAT5320-8T
• HAT5300-12T
• HAT5310-16T
• HAT5310-20T
• HAT5320-24T

Enterprise 2.5-inch SATA SSD

• SAT5221-480G
• SAT5221-960G
• SAT5221-1920G
• SAT5221-3840G
• SAT5210-7000G

Enterprise M.2 NVMe SSD

• SNV3410-400G
• SNV5420-400G
• SNV5420-800G
• SNV5420-1600G

Compatibility Note: Always confirm the exact model and firmware against Synology's current DS425+ Compatibility List before purchase.

Compatible Upgrades & Accessories

Increase Memory

• D4NS01-4G – 4GB DDR4 non-ECC SODIMM

Maximum total system memory: 6GB

SSD Cache

Compatible Synology SNV3400 and SNV5400 Series M.2 NVMe SSDs can be used for SSD cache.

Surveillance Station

The DS425+ includes 2 Surveillance Station device licences.

It supports up to 40 IP cameras at 1080p under Synology's specified test conditions.

Additional cameras require additional Synology Surveillance Device Licences.

Specifications

What’s in the Box

• Synology DS425+ Main Unit × 1
• Accessory Pack × 1
• AC Power Adapter × 1
• AC Power Cord × 1
• RJ-45 LAN Cable × 2

Not Included: Storage drives and optional M.2 NVMe SSDs.

Warranty

3-Year Synology Hardware Warranty

Sustainability

• RoHS Compliant