| Specification | Details |
|---|---|
| Hardware Specifications | |
| CPU | |
| CPU Model | Intel Celeron J4125 |
| CPU Quantity | 1 |
| CPU Cores | 4 |
| CPU Threads | 4 |
| CPU Architecture | 64-bit |
| CPU Frequency | 2.0GHz base / 2.7GHz turbo |
| Hardware Encryption Engine | Supported |
| Memory | |
| System Memory | 2GB DDR4 non-ECC |
| Total Memory Slots | 1 |
| Maximum Memory Capacity | 6GB, 2GB + 4GB |
| Memory Note | Synology may revise pre-installed memory module specifications due to component lifecycle and supply conditions. Revised components are validated for compatibility, stability and performance. |
| Memory Expansion Note | Synology recommends using Synology memory modules for optimum compatibility and reliability. |
| Storage | |
| Drive Bays | 4 × 3.5" SATA HDD or 2.5" SATA SSD; 2 × M.2 2280 NVMe SSD |
| Hot Swappable Drive | Supported |
| Hot Swap Note | Hot swappable drive feature is not supported by M.2 SSD slots. |
| Storage Note | Synology only guarantees full functionality, reliability and performance for compatible drives. Please check the Synology compatibility list before purchasing drives. |
| SSD Cache Note | SSD cache can be enabled with selected compatible SSDs. SSDs are sold separately. |
| External Ports | |
| RJ-45 1GbE LAN Port | 1 |
| RJ-45 2.5GbE LAN Port | 1 |
| USB 3.2 Gen 1 Port | 2 |
| Network Note | 1GbE LAN ports have a maximum transmission unit, MTU, size of 1,500 bytes. |
| Appearance | |
| Dimensions | 166 × 199 × 223 mm |
| Weight | 2.18kg |
| Others | |
| System Fan | 92 × 92 mm, 2 pieces |
| Fan Speed Mode | Full-Speed Mode, Cool Mode, Quiet Mode |
| Brightness Adjustable Front LED Indicators | Supported |
| Power Recovery | Supported |
| Noise Level | 21.6 dB(A) |
| Scheduled Power On / Off | Supported |
| Wake on LAN / WAN | Supported |
| Power Supply Unit / Adapter | 90W |
| AC Input Power Voltage | 100V to 240V AC |
| Power Frequency | 50/60Hz, Single Phase |
| Power Consumption | 28.25W access; 6.10W HDD hibernation |
| British Thermal Unit | 96.33 BTU/hr access; 20.79 BTU/hr HDD hibernation |
| Noise Testing Note | Tested fully installed with Synology SATA SSDs in idle state, with microphones placed 1m from the front and rear of the device. |
| Temperature | |
| Operating Temperature | 0°C to 40°C |
| Storage Temperature | -20°C to 60°C |
| Operating Humidity | 8% to 80% RH |
| Storage Humidity | 5% to 95% RH |
| Certification | |
| Certifications | FCC, CE, BSMI, VCCI, RCM, UKCA, EAC, CCC, KC, BIS |
| Warranty | |
| Warranty | 3-Year Hardware Warranty, extendable to 5 years with EW201 or Extended Warranty Plus |
| Warranty Note | Warranty period starts from the purchase date stated on the receipt. |
| Extended Warranty Note | Extended Warranty Plus is available in Europe and North America. EW201/EW202 is available in Asia, Africa and Oceania. |
| Environment | |
| Environmental Compliance | RoHS Compliant |
| Packaging Content | |
| Box Contents | Main Unit × 1, Accessory Pack × 1, AC Power Adapter × 1, AC Power Cord × 1, RJ-45 LAN Cable × 2 |
| Optional Accessories | |
| Optional Accessories | DDR4 non-ECC SODIMM: D4NS01-4G; Enterprise Series 3.5" SATA HDD: HAT5300 Series; Plus Series 3.5" SATA HDD: HAT3300 Series; Enterprise Series 2.5" SATA SSD: SAT5200 Series; Enterprise Series M.2 2280 NVMe SSD: SNV3400 & SNV5400 Series |
| DSM Specifications | |
| Storage Management | |
| Maximum Single Volume Size | 108TB |
| Maximum Internal Volume Number | 32 |
| M.2 SSD Storage Pool Support | Supported |
| SSD Read/Write Cache | Supported |
| SSD TRIM | Supported |
| Storage Efficiency | Supported |
| Supported RAID Type | Synology Hybrid RAID, Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10 |
| RAID Migration | Basic to RAID 1; Basic to RAID 5; RAID 1 to RAID 5; RAID 5 to RAID 6 |
| Volume Expansion with Larger HDDs | Synology Hybrid RAID, RAID 1, RAID 5, RAID 6, RAID 10 |
| Volume Expansion by Adding a HDD | Synology Hybrid RAID, JBOD, RAID 5 |
| Global Hot Spare Supported RAID Type | Synology Hybrid RAID, RAID 1, RAID 5 |
| Storage Management Note | Each internal volume may be expanded up to 108TB. Actual maximum storage pool and volume sizes depend on drive sizes, number of drive bays and RAID configuration. |
| Usable Capacity Note | Usable capacity will be lower depending on filesystem and system metadata. |
| M.2 Storage Pool Note | Creating M.2 storage pools requires Synology-verified SSDs. |
| Storage Efficiency Note | Storage efficiency helps reduce storage space consumption through deduplication and compression. |
| File System | |
| Internal Drives | Btrfs, ext4 |
| External Drives | Btrfs, ext4, ext3, FAT32, NTFS, HFS+, exFAT |
| File Services | |
| File Protocol | SMB, AFP, NFS, FTP, WebDAV, Rsync |
| Maximum SMB Connections | 10 |
| Windows ACL Integration | Supported |
| NFS Kerberos Authentication | Supported |
| File Services Note | Connection value tested with Synology SATA HDD fully populated and all onboard network ports. |
| Performance Testing Note | SMB performance was evaluated using Microsoft File Server Capacity Tool, FSCT, version 1.3. |
| Account & Shared Folder | |
| Maximum Local User Accounts | 512 |
| Maximum Local Groups | 128 |
| Maximum Shared Folders | 128 |
| Maximum Shared Folder Sync Tasks | 4 |
| Hybrid Share | |
| Maximum Hybrid Share Folders | 10 |
| Hyper Backup | |
| Folder and Package Backup | Supported |
| Entire System Backup | Supported |
| High Availability | |
| Synology High Availability | Supported |
| Log Center | |
| Syslog Events per Second | 800 |
| Virtualization | |
| VMware vSphere | ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5 |
| Microsoft Hyper-V | Windows Server 2022 |
| Citrix XenServer | XenServer 8, Citrix Hypervisor 8.2 LTSR CU1 |
| OpenStack | Cinder |
| General Specifications | |
| Supported Protocols | SMB1, SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPS, FTP, SNMP, LDAP, CalDAV |
| Supported Browsers | Chrome, Firefox, Edge, Safari |
| Supported Languages | English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文 |
| General Note | For the latest supported browser versions, refer to DSM Technical Specifications. |
Product Features
Synology DiskStation DS425+ is a compact 4-bay NAS designed for small offices, home offices, and professional users who need reliable storage, backup, file sharing, and private cloud access. It offers high-speed connectivity, flexible storage options, and Synology DSM software features for easier data management.
- Compact 4-bay NAS for centralized storage and file management
- Supports up to 96TB raw storage capacity
- Built-in 2.5GbE LAN port for faster network performance
- Delivers up to 278MB/s read and 281MB/s write performance
- Supports both 3.5" SATA HDD and 2.5" SATA SSD
- Includes 2 × M.2 NVMe slots for SSD cache or storage pool use
- Private cloud access for storing, syncing, accessing, and sharing files across devices
- Supports Synology Drive for file sync, sharing, and version recovery
- Supports Synology Photos for photo and video backup, organization, and sharing
- Supports multi-site NAS-to-NAS synchronization
- Syncs with public cloud services such as Google Drive, Dropbox, Microsoft OneDrive, and Backblaze B2
- Supports PC, server, virtual machine, SaaS, and mobile device backup
- Supports immutable snapshots to help protect shared folders and LUNs from tampering
- Supports Synology Surveillance Station for centralized video surveillance
- Supports up to 40 IP cameras
- Includes 2 free camera licenses for Surveillance Station
- Centralized monitoring and management with Synology DSM tools
- Backed by 3-year limited hardware warranty
