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Synology 16TB DS925+ 4-Bay NAS Enclosure Kit with RAM Expansion (4 x 4TB 5400 rpm)

BH #SYDS925PK2 (B&H Kit)
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Synology 16TB DS925+ 4-Bay NAS Enclosure Kit with RAM Expansion (4 x 4TB 5400 rpm)
Key Features
  • 16TB Storage Capacity
  • 4 x 4TB 5400 rpm SATA III 3.5" NAS HDDs
  • 4 x 3.5/2.5" Bays | 2 x M.2 2280 Slots
  • 2.2 GHz AMD Ryzen V1500B Quad-Core
This B&H Kit combines the Synology DS925+ 4-Bay NAS Enclosure with four Synology 4TB HAT3300 Plus 5400 rpm SATA III 3.5" Internal NAS HDDs for a storage capacity of 16TB. Also included is a Synology 4GB DDR4 SO-DIMM ECC Memory Module, bringing the total amount of memory to 8GB.
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Kit Contains:

This B&H Kit combines the Synology DS925+ 4-Bay NAS Enclosure with four Synology 4TB HAT3300 Plus 5400 rpm SATA III 3.5" Internal NAS HDDs for a storage capacity of 16TB. Also included is a Synology 4GB DDR4 SO-DIMM ECC Memory Module, bringing the total amount of memory to 8GB.

Synology DS925+ 4-Bay NAS Enclosure

The DS925+ 4-Bay NAS Enclosure from Synology is a capable solution that can adapt to growing storage demands, with support for up to nine drives with an optional expansion unit, two NVMe M.2 2280 slots for SSD caching, two built in 2.5GbE ports. Powered by Synology DiskStation Manager (DSM), it offers a flexible all-in-one solution for data sharing, synchronization, backup, and surveillance. The DS925+ is equipped with four drive bays that are capable of natively supporting 3.5" SATA III hard drives as well as 2.5" SATA III hard drives and SSDs.

The DS925+ runs on Synology DiskStation Manager (DSM) OS, which is a browser-based operating system that helps to simplify managing your Synology NAS. Its CPU is a 2.2 GHz AMD Ryzen V1500B Quad-Core and its 4GB of DDR4 RAM, which can be upgraded to 32GB, allows frequently used files and applications to be quickly accessed. This NAS is capable of sequential read speeds up to 522 MB/s and sequential write speeds up to 565 MB/s.

Also featured are two USB-A 3.2 Gen 1 ports that allow it to be connected to external storage or other USB devices, a USB-C port for the DX525 expansion unit, and network connectivity is achieved via the dual integrated 2.5 Gigabit Ethernet ports that support link aggregation and failover, allowing your stored data to be shared with users throughout the network. For those who require RAID support, the DS925+ supports RAID 0, 1, 5, 6, and 10, as well Synology Hybrid RAID and Basic RAID, each of which offers performance, data redundancy, or a combination of both. For those who do not require a RAID, JBOD is also available, allowing each drive bay to be individually utilized.

The DS925+ is engineered to be energy efficient and its dual 92mm fans to help keep the system running cool at all times. The server supports numerous scheduled power on/off cycles and hard drive hibernation to further minimize power consumption and operation expenses.

The Synology DiskStation DS925+ 4-Bay NAS Enclosure operates on 100-240 VAC at 50/60 Hz and includes an accessory pack, an AC power adapter, an AC power cord, and two RJ45 LAN cables. It is protected by a limited 3-year warranty.

Versatile Storage for Any Purpose
The DS925 offers intuitive and comprehensive file management, media organization, and backup options right out of the box. Its capable performance and compact size make it perfect for users with space constraints, including IT enthusiasts, creative professionals, and businesses of all sizes. It is an ideal edge device for branch offices or retail locations for small firms or large enterprises.
  • Up to 522 MB/s sequential read and 565 MB/s sequential write speeds enables fast file sharing, syncing, streaming, and backup for multiple users.
  • Two 2.5GbE ports offer fast networking, with Link Aggregation supporting failover and load balancing capabilities.
  • Supports four 2.5" SATA SSDs and 3.5" SATA HDDs. Synology hard drives and SSDs are designed to integrate seamlessly with Synology systems, delivering exceptional reliability.
  • Expandable to 9 drives with Synology DX525 expansion unit.
  • Two built-in M.2 slots provide SSD caching capability without occupying drive bays.

 

Ease of Use and Security Features
A suite of convenience and security features, combined with DSM's intuitive UI, ensures seamless experience for users of all levels of expertise.
  • Easily access your system from any web browser via QuickConnect.
  • Adaptive Multi-Factor Authentication (AMFA) triggers upon suspicious external logins, providing an additional layer of security.
  • Improve management efficiency with customizable delegation roles, allowing admins to quickly assign roles to non-admin users while restricting access to critical system settings.
  • Active Insight, Synology's cloud-based fleet monitoring solution, leverages machine learning to detect malware and other malicious activity and automatically creates immutable snapshots to protect your data.

 

Built-In Data Protection Solutions
License-free solutions help protect data and configurations on your Synology system, ensure maximum system uptime, and back up and restore all your devices, VMs, and cloud applications.
  • Synology Active Backup Suite consolidates backup tasks and offers rapid restoration of Windows and Linux endpoints, VMs, Synology NAS, and SaaS applications.
  • Hyper Backup backs up your Synology system data to multiple destinations securely and efficiently with integrity checks and powerful deduplication, compression, and versioning options.
  • Snapshot Replication provides schedulable, near-instantaneous data protection with version control, ensuring that all shared folders and LUNs on your Synology system remain safe and available.
  • C2 Storage for Hyper Backup offers a dedicated secure public cloud destination for Synology NAS backup data.

 

A Collaboration, Communication, and Organization Hub
Synology provides a private cloud solution for on-site and remote workers as well as home users, to concurrently edit documents, share files, manage emails, send instant messages, manage photos, and more.
  • Synology Drive serves as a centralized hub to keep your files labeled and organized for easy access, offering granular file sharing permissions and customizable security features to ensure file safety.
  • Synology Photos provides a comprehensive solution for storing, organizing, and sharing photos and videos, with powerful features suitable for both personal and professional use.
  • Synology Office enables users to collaborate on documents, spreadsheets, and presentation slides in real time, supported by convenient options such as file versioning for easy restoration and password protection.
  • Synology Chat brings teams together with one-on-one chats, group chats, and encrypted private channels over multiple platforms.
  • Synology MailPlus provides a secure, reliable, and private email server.
  • Synology Calendar helps teams keep track of priorities with convenient calendar sharing and scheduling.
  • Synology Hybrid Share enhances multi-site teamwork with a global hybrid cloud file system which combines the scalability of the cloud with the fast local access provided by Synology systems.

 

Private Video Surveillance
Synology Surveillance Station transforms any Synology system into a powerful network video recorder (NVR).
  • 8700 supported camera models.
  • ONVIF support for a broader selection of cameras.
  • Private, subscription-free storage of recordings.
  • Access through web browsers, desktop clients, and mobile apps.
  • Event-based rules to trigger specific actions.
  • Email, SMS, and push notification options.
  • Simultaneous recording to the cloud with C2 Backup for Surveillance for an extra layer of data protection and more convenient sharing.

 

UPC: 846504006007
Synology 4TB HAT3300 Plus 5400 rpm SATA III 3.5" Internal NAS HDD

Designed to meet the reliability, endurance, and performance requirements of 24/7 storage in small and medium-sized business storage systems, the 4TB HAT3300 Plus 5400 rpm SATA III 3.5" Internal NAS HDD from Synology delivers NAS-class reliability to ensure consistent performance in high-uptime and multi-user environments. The HAT3300 Plus has passed 300,000 hours of testing, has a Mean Time to Failure (MTTF) rating of 1 million hours, and a yearly workload rating of 180TB. Also featured is a storage capacity of 4TB, a SATA III 6 Gb/s interface, a 256MB cache, and a rotational speed of 5400 rpm, all of which help to ensure uninterrupted data transfers with sustained speeds of up to 202 MB/s.

Please check Synology's compatibility list, as this drive is not compatible with all storage systems.

Reliable Always-On Operation
Backed by 1 million hours MTBF and 180 TB/year workload rating.
Tested for Maximum Reliability
Stringent validation and up to 300,000 hours of testing ensure reliability in Synology systems.
Seamless Firmware Updates
Firmware updates can be performed directly in Synology DSM.
Reliable Recording Technology
Conventional magnetic recording (CMR) technology offers consistent performance.
Engineered for Endurance
Synology Plus Series HDDs are backed by a 1 million hour Mean Time Between Failures (MTBF) rating and 180TB per year workload rating, which is up to three times the limit of conventional desktop hard drives. Over 300,000 hours of compatibility and stress testing ensure smooth operation even under multi-user workloads.
Convenient Firmware Updates
Users are automatically notified when firmware updates become available for Synology Plus Series HDDs and can update drives seamlessly from DiskStation Manager (DSM) on their Synology storage system, eliminating the need for third-party tools and disk removal for firmware updates.
UPC: 846504005123
Synology 4GB DDR4 SO-DIMM ECC Memory Module

Refresh NAS performance with the 4GB DDR4 SO-DIMM ECC Memory Module from Synology. Unbuffered and utilizing error-correcting code (ECC), this 260-pin SO-DIMM module provides 4GB of DDR4 RAM that is compatible with select Synology NAS arrays.

Compatbility
  • 25 Series: DS925+ and DS725+
  • 21 Series: RS1221RP+, RS1221+, DS1821+, and DS1621+
UPC: 846504006441
Kit Contains:

Synology DS925+ 4-Bay NAS Enclosure

Key Specs
RAID
Yes: Supported RAID Modes: 0 / 1 / 5 / 6 / 10 / Basic / Hybrid
Number of Bays
4x 2.5"/3.5" SATA III
2x M.2 (2280) NVMe
Inputs/Outputs
2x RJ45 2.5GbE
2x USB-A 3.0 / 3.1/3.2 Gen 1
1x USB-C 3.0 / 3.1/3.2 Gen 1
Computing
CPU
Quad-Core: Up to 2.2 GHz
Processor
AMD Ryzen V 1500B
GPU
No
Memory
4 GB ECC DDR4
RAM Configuration / Capacity
1x User-Replaceable 4 GB Module / 2 Slots Supporting up to 32 GB (SO-DIMM)
Drives
RAID
Yes: Supported RAID Modes: 0 / 1 / 5 / 6 / 10 / Basic / Hybrid
Transfer Rates
522 MB/s (Read)
565 MB/s (Write)
General
Number of Bays
4x 2.5"/3.5" SATA III
2x M.2 (2280) NVMe
Inputs/Outputs
2x RJ45 2.5GbE
2x USB-A 3.0 / 3.1/3.2 Gen 1
1x USB-C 3.0 / 3.1/3.2 Gen 1
Media Card Slots
No
PCI Expansion
No
Networking
Link Aggregation and Failover Support
Yes
iSCSI Support
Yes: 2 LUN / 2 Target
Software
Installed Operating System
Synology DSM
OS Compatibility
Windows
macOS
Linux
Mobile App Compatible
Yes: Android & iOS
Security
Security Features
Kensington Security Slot
VPN Connections
8 (Server)
Electrical
Input Power
100 to 240 VAC, 50 / 60 Hz
Power Consumption
37.91 W (Typical)
12.33 W (Standby)
PSU
1 x 100 W
Physical
Operating Conditions
32 to 104°F / 0 to 40°C at 5 to 95% Humidity
Storage Conditions
-4 to 140°F / -20 to 60°C at 5 to 95% Humidity
Certifications
BIS, BSMI, CCC, CE, EAC, FCC, KC, RCM, UKCA, VCCI
Cooling
2x 92 mm Fan
Noise Level
20.5 dBA
Dimensions
8.8 x 7.8 x 6.5" / 223 x 199 x 166 mm
Weight
5.1 lb / 2.3 kg
Packaging Info
Package Weight
7.97 lb
Box Dimensions (LxWxH)
11.3 x 10.2 x 9.6"

Synology DS925+ Reviews

Easy storage and simple compute setup!

By Omar
Rated 5 out of 5
Date: 2026-05-07

I recently picked up the Synology DS925+ and have been very happy with it so far. I’m using it both as my main storage solution and to run Home Assistant, and it has handled both roles really well. Setup was straightforward, DSM is polished and easy to manage, and the system feels reliable without needing much babysitting. For storage, it gives me exactly what I wanted: centralized files, backups, and room to grow. Running Home Assistant on it has also been smooth, which was one of the main reasons I chose this model. The 925 feels like a good balance between power, flexibility, and simplicity. It is probably more than someone needs for basic file storage, but if you want a NAS that can also run services like Home Assistant, it is a strong choice. I’d recommend it for anyone who wants dependable home storage with enough headroom for more advanced uses.

Easy to Use

By Ethan
Rated 5 out of 5
Date: 2026-04-12

Great compact NAS drive, just setting it up now and it's very straight forward.

See any errors on this page?

If I need to access this storage securely using ...

If I need to access this storage securely using my mobile phone, how do I do that? What else do I need?
Asked by: Sanjay
Once you have drives installed inside the Synology DS925+ 4-Bay NAS Enclosure and it is running and online, you can access it securely using this app on your iPhone or Android device: https://bhpho.to/47pF7Gb.
Answered by: Jordan K
Date published: 2025-10-27

Is the DX517 compatible with the DX925+

Is the DX517 compatible with the DX925+
Asked by: Luther
No, the Synology DS925+ 4-Bay NAS Enclosure is not compatible with the Synology DX517 5-Bay Expansion Enclosure. The DS925+ uses the Synology DX525 5-Bay Expansion Enclosure, B&H # SYDX525.
Answered by: Kenneth C
Date published: 2025-11-09

There is some confusion around what hard drives ...

There is some confusion around what hard drives this device accepts, e.g., Synology branded versus third party. Details?
Asked by: Tobias
The website now states they will accept third party with possible warranty limitations. Look for the enterprise versions of the Synology HDD, they have closer specs to the best competitor.
Answered by: Dana
Date published: 2026-02-08

I heard the latest firmware/software update for ...

I heard the latest firmware/software update for the DS925+ now supports 3rd party hard drives?
Asked by: Brad
The Synology DS925+ 4-Bay NAS Enclosure and other 2025 enclosures from Synology no longer restrict third party drives with the latest firmware update. Still, the Synology compatibility guide only recommends and verifies Synology branded drives at this time.
Answered by: Jordan K
Date published: 2025-12-22

Are the drives in ds925+ hot swappable?

Are the drives in ds925+ hot swappable?
Asked by: Fred
Yes, the Synology DS925+ 4-Bay NAS Enclosure has hot-swappable drive bays for 2.5" SATA SSDs and 3.5" SATA HDDs.
Answered by: Michael S
Date published: 2026-03-30
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