Synology 20TB DiskStation DS1525+ 5-Bay NAS Enclosure Kit with RAM Expansion (5 x 4TB)

BH #SYDS1525PK2 (B&H Kit)
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Synology 20TB DiskStation DS1525+ 5-Bay NAS Enclosure Kit with RAM Expansion (5 x 4TB)
Key Features
  • 20TB Storage Capacity
  • 5 x 4TB 5400 rpm SATA III 3.5" NAS HDDs
  • 5 x 3.5/2.5" SATA III Drive Bays
  • Dual M.2 2280 Slots for Caching/Storage
This B&H Kit combines the Synology DiskStation DS1525+ 5-Bay NAS Enclosure with five Synology 4TB HAT3300 Plus 5400 rpm SATA III 3.5" Internal NAS HDDs for a storage capacity of 20TB. Also included is a Synology 8GB DDR4 SO-DIMM ECC Memory Module, bringing the total amount of memory to 16GB.
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Kit Contains:

This B&H Kit combines the Synology DiskStation DS1525+ 5-Bay NAS Enclosure with five Synology 4TB HAT3300 Plus 5400 rpm SATA III 3.5" Internal NAS HDDs for a storage capacity of 20TB. Also included is a Synology 8GB DDR4 SO-DIMM ECC Memory Module, bringing the total amount of memory to 16GB.

Synology DiskStation DS1525+ 5-Bay NAS Enclosure

The DiskStation DS1525+ 5-Bay NAS Enclosure from Synology is a versatile 5-bay storage solution that scales with your needs. It supports up to 15 drives with two DX525 expansion units, 10GbE networking via a PCIe 3.0 x2 expansion slot, and NVMe SSD caching or storage with two M.2 2280 slots. Powered by Synology DiskStation Manager (DSM), it offers a flexible all-in-one solution for data sharing, synchronization, backup, and surveillance.

This NAS is equipped with five drive bays that are capable of natively supporting 3.5" SATA hard drives as well as 2.5" SATA hard drives and SSDs for data storage. The CPU is a 2.2 GHz AMD Ryzen V1500B 4-Core that is paired with 8GB of DDR4 ECC RAM, both of which allow frequently used files and applications to be quickly accessed. The NAS is capable of achieving sequential read speeds of up to 1181 MB/s and sequential write speeds of up to 1180 MB/s.

Also featured are two USB-A 3.2 Gen 1 ports and two USB-C expansion ports, and network connectivity is achieved via the two 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 DS1525+ supports RAID 0, 1, 5, 6, and 10 as well as 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 Synology DiskStation DS1525+ keeps cool using dual 92mm fans and operates on 100-240 VAC at 50/60 Hz. Included is an accessory pack, an AC adapter, an AC power cord, and two RJ45 LAN cables. Protection is provided by a limited 3-year warranty.

Versatile Storage for Any Purpose
The DS1525+ offers intuitive and comprehensive file management, media organization, and backup options right out of the box. Its capable performance, compact size, and versatile configuration options make it ideal for IT enthusiasts, creative professionals, and businesses of various sizes, from small firms to large enterprises as an edge device for branch offices or retail locations.
  • Up to 1181 MB/s sequential read speeds and 1180 MB/s sequential write speeds enables fastfile sharing, syncing, streaming, and backup for multiple users
  • Two 2.5GbE ports offer fast networking, with Link Aggregation supporting failover and load balancing capabilities
  • Support for 10GbE networking via a 10GbE RJ45 Network Upgrade Module provides versatility and future proofing
  • Supports five 2.5" SATA SSD and 3.5" SATA HDDs. Synology hard drives and SSDs aredesigned to integrate seamlessly with Synology systems, delivering exceptional reliability
  • Expandable to 15 drives with two Synology DX525 expansion units
  • 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 a 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 Insight9, 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

 

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

 

Reliable Virtualization and Containerization
Leverage your Synology system as virtual machine storage, and alternative container or VM host, with full certification for VMware vSphere, Microsoft Hyper-V, Citrix XenServer, and OpenStack environments.
  • Synology Storage Console for VMware or Windows platforms lets you manage VM storage components directly from your hypervisor. VMware VAAI integration and Windows ODX help offload storage operations and speed up data transfers
  • Host lightweight containers and VMs for testing, sandboxing, and emergency recovery purposes with Container Manager and Synology Virtual Machine Manager, a native hypervisor that supports Windows, Linux, and virtual versions of DSM

 

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: 846504006014
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 8GB DDR4 SO-DIMM ECC Memory Module

Refresh NAS performance with the 8GB DDR4 SO-DIMM ECC Memory Module from Synology. Unbuffered and utilizing error-correcting code (ECC), this 260-pin SO-DIMM module provides 8GB of DDR4 RAM that is compatible with select Synology NAS arrays.

Compatbility
  • 25 Series: DS1825+, DS1525+, DS925+, and DS725+
  • 23 Series: DS1823xs+, DS923+, and DS723+
  • 22 Series: RS822RP+, RS822+, DS3622xs+, DS2422+, and DS1522+
UPC: 846504006458
Kit Contains:

Synology DiskStation DS1525+ 5-Bay NAS Enclosure

Key Specs
RAID
Yes: Supported RAID Modes: 0 / 1 / 5 / 6 / 10 / Basic / Hybrid
Number of Bays
5x 2.5"/3.5" SATA III (Hot-Swap)
2x M.2 (2280) NVMe (Carrier-Less)
Inputs/Outputs
2x RJ45 2.5GbE
2x USB-A 3.0 / 3.1/3.2 Gen 1
2x USB-C
Computing
CPU
Quad-Core: Up to 2.2 GHz
Processor
AMD Ryzen V 1500B (25 W TDP)
GPU
No
Memory
8 GB ECC DDR4
RAM Configuration / Capacity
1x User-Replaceable 8 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
1181 MB/s (Read)
1180 MB/s (Write)
General
Number of Bays
5x 2.5"/3.5" SATA III (Hot-Swap)
2x M.2 (2280) NVMe (Carrier-Less)
Inputs/Outputs
2x RJ45 2.5GbE
2x USB-A 3.0 / 3.1/3.2 Gen 1
2x USB-C
Media Card Slots
No
PCI Expansion
1x PCIe 3.0 x2
Networking
Link Aggregation and Failover Support
Yes
iSCSI Support
Yes: 128 LUN / 64 Target
Software
Installed Operating System
No
OS Compatibility
Windows
macOS
Linux
Mobile App Compatible
Yes: Android & iOS
Security
Encryption
No
Security Features
Kensington Security Slot, Lockable Bay Door
VPN Connections
8 (Server)
Electrical
Input Power
100 to 240 VAC, 50 / 60 Hz
Physical
Operating Conditions
32 to 104°F / 0 to 40°C at 5 to 95% Humidity
Storage Conditions
-5 to 140°F / -20 to 60°C at 5 to 95% Humidity
Cooling
2x 92 mm Fans
Dimensions
9.1 x 8.8 x 6.5" / 230 x 223 x 166 mm
Weight
6.0 lb / 2.7 kg
Packaging Info
Package Weight
10.48 lb
Box Dimensions (LxWxH)
12.4 x 11.6 x 11.5"

Synology DS1525+ Reviews

Great NAS

By Steve
Rated 5 out of 5
Date: 2026-06-25

This is a great little NAS. It is solid in performance and speed. Upgrading from a 1512 from 13 years ago so they also last a long time. DSM makes it easy to manage and the RAID 5 with a hot spare configuration works great if a drive starts to have issues. Highly recommend. I use it at my church and all staff enjoy having a common repository for files and also personal space.

SYNOLOGY 1525+ IS GREAT

By Martin
Rated 5 out of 5
Date: 2026-03-10

This is my 4th Synology nas. I got this one to replace a 1515+ which I had to 10 years. All other units including one from 2011 are still running well. The 1515 had a problem with a capacitor that caused it to fail after 11 years. The new 1525+ has so much more horsepower than any other synology that I've ever had. It doesn't strain under workloads that would make the older unit struggle. I'm loving this.

See any errors on this page?

Does this unit work with seagate ironwolf pro ...

Does this unit work with seagate ironwolf pro hard disks? If not, which disks are compatible?
Asked by: AV
Synology got so much grief from trying to sell their own branded hard drives as the only ones that were fully compatible that they’ve changed their tune. They are back to allowing 3rd-party drives. I have a Synology DS418play NAS and use 4 x 16 TB Seagate IronWolf Pro hard drives. They are fully compatible and used to be on the list of compatible HDDs. They’ll work fine!
Answered by: Jeff
Date published: 2025-12-17
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