| Specification | Details |
|---|---|
| Hardware Specifications | |
| CPU | |
| CPU Model | AMD Ryzen V1500B |
| CPU Quantity | 1 |
| CPU Cores | 4 |
| CPU Threads | 8 |
| CPU Architecture | 64-bit |
| CPU Frequency | 2.2GHz |
| Hardware Encryption Engine | Supported |
| Memory | |
| System Memory | 4GB DDR4 ECC SODIMM |
| Memory Module Pre-installed | 4GB, 4GB × 1 |
| Total Memory Slots | 2 |
| Maximum Memory Capacity | 32GB, 16GB × 2 |
| 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. |
| Multi-module Memory Note | For multi-module memory configurations, all modules must be identical and share the same model number. |
| Storage | |
| Drive Bays | 4 × 3.5" SATA HDD or 2.5" SATA SSD; 2 × M.2 2280 NVMe SSD |
| Maximum Drive Bays with Expansion Unit | 9, with DX525 × 1 |
| 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 2.5GbE LAN Port | 2 |
| USB 3.2 Gen 1 Port | 2 |
| Expansion Port | 1 |
| Expansion Port Type | USB Type-C |
| Appearance | |
| Dimensions | 166 × 199 × 223 mm |
| Weight | 2.26kg |
| 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 | 20.5 dB(A) |
| Scheduled Power On / Off | Supported |
| Wake on LAN / WAN | Supported |
| Power Supply Unit / Adapter | 100W / 120W |
| AC Input Power Voltage | 100V to 240V AC |
| Power Frequency | 50/60Hz, Single Phase |
| Power Consumption | 37.91W access; 12.33W HDD hibernation |
| British Thermal Unit | 129.27 BTU/hr access; 42.05 BTU/hr HDD hibernation |
| Noise Testing Note | Tested fully installed with Synology SATA HDDs 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 ECC SODIMM: D4ES04-4G / D4ES03-8G / D4ES03-16G; Expansion Unit: DX525; Enterprise 3.5" SATA HDD: HAT5300 Series; Plus 3.5" SATA HDD: HAT3300 Series; Enterprise 2.5" SATA SSD: SAT5200 Series; Enterprise M.2 2280 NVMe SSD: SNV3400 & SNV5400 Series |
| Optional Accessories Note | For multi-module memory configurations, all modules must be identical and share the same model number. |
| DSM Specifications | |
| Storage Management | |
| Maximum Single Volume Size | 200TB with 32GB memory required; 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, RAID 6 with Expansion Unit |
| Global Hot Spare Supported RAID Type | Synology Hybrid RAID, RAID 1, RAID 5, RAID 6 with Expansion Unit, RAID 10 with Expansion Unit |
| Storage Management Note | Volumes over 108TB require 32GB memory or more. 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 | 40 |
| 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 8.4, 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 DS925+ is a flexible 4-bay NAS designed for home offices, small businesses and edge storage environments. It provides high-speed file storage, private cloud access, backup, synchronization and surveillance support in one compact solution.
- 4-bay NAS for centralized storage, backup and file sharing
- Supports up to 96TB raw storage, expandable up to 216TB with DX525 expansion unit
- Built-in dual 2.5GbE LAN ports for faster network connectivity
- Delivers up to 522MB/s read and 565MB/s write sequential performance
- Supports 3.5" SATA HDD, 2.5" SATA SSD and M.2 NVMe SSD
- 2 × M.2 NVMe slots for SSD cache or storage pool creation
- Powered by AMD Ryzen V1500B, 4-core / 8-thread processor
- Comes with 4GB DDR4 ECC memory, expandable up to 32GB
- Supports Synology Drive for private cloud file access, sharing, syncing and version recovery
- Supports Synology Photos for photo and video backup, organization and sharing
- Syncs with cloud platforms such as Google Drive, Dropbox, Microsoft OneDrive and Backblaze B2
- Supports NAS-to-NAS synchronization for multi-site file sharing
- Supports backup for PCs, file servers, virtual machines, SaaS applications and mobile devices
- Supports immutable snapshots to help protect shared folders and LUNs against tampering
- Supports Synology Surveillance Station for centralized video surveillance
- Supports up to 40 IP cameras and includes 2 free camera licenses
- Supports Hyper Backup for system, application, folder and full NAS backup
- Centralized monitoring and management through Synology DSM tools
- Backed by 3-year limited hardware warranty, extendable to 5 years
