Expansion Unit RX1225RP
Reliable storage expansion with redundant power
Overview:
Seamless 12-bay capacity expansion
Add 12 additional storage bays to compatible RackStation systems with a single RX1225RP without system or service downtime.
- Capacity Expansion
Add 12 additional 3.5"/2.5" SATA HDD/SSD - Hardware Redundancy
Redundant power supply prevents single points of failure - Fast and Intuitive Setup
Configure new storage in minutes with Synology DSM's unified tools - Uninterrupted Storage Exansion
Add new volumes or expand current volumes without service interruptions - Long-Term Support
Backed by Synology’s 5-year limited warranty
Features:
Rapid Deployment
RX1223RP provides simple storage expansion with 12 drive bays for 3.5”/2.5” SATA HDD/SDD drives.
Up to eight RX1223RP expansion units can be added to compatible serves for up to 1.7 petabytes of additional raw storage.
Redundant design for high reliability
Handle both scheduled storage upgrades and sudden demands with ease. With plug-and-play compatibility and support for hot-swapping drives, the RX1225RP is ready to use as soon as it’s connected to the host device, allowing for drive installation without powering down the system.


Simple deployment and management
Get up and running without delay thanks to RX1225RP's plug-and-play design. Easily expand and manage your storage using the intuitive Storage Manager in Synology DiskStation Manager.
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Technical Specifications:
Hardware Specifications: | |
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Applied Models | RS2825RP+ |
Storage | |
Drive Bay(s) | 12 |
Compatible Drive Type |
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Hot Swappable Drive | |
RAID Management through Synology DSM | |
External Ports | |
Expansion Port | 1 |
Appearance | |
Size (Height X Width X Depth) | 88 mm x 430.5 mm x 692 mm |
Size (Height X Width X Depth) (with server ears) | 88 mm x 482 mm x 724 mm |
Weight | 13.9 kg |
Rack Installation Support | 4-post 19" rack (Synology Rail Kit - RKS-02) |
Notes | The rail kit is sold separately |
Power | |
Power Recovery | Synchronized with the Synology DiskStation |
Power Supply Unit / Adapter | 550W |
AC Input Power Voltage | 100V to 240V AC |
Power Frequency | 50/60 Hz, Single Phase |
Power Consumption* |
92.13 W (Access) 33.44 W (HDD Hibernation) |
British Thermal Unit |
314.16 BTU/hr (Access) 114.03 BTU/hr (HDD Hibernation) |
Note | Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s). |
Redundant Power Supply | |
Temperature | |
Operating Temperature | 5°C to 40°C (40°F to 104°F) |
Storage Temperature | -10°C to 70°C (-15°F to 155°F) |
Relative Humidity | 5% to 95% RH |
Others | |
System Fan | 80 mm x 80 mm x 4 pcs |
Easy Replacement System Fan | |
Noise Level | 39.5 dB(A) |
Note | Noise Level Testing Environment: Fully loaded with Seagate 1TB ST31000520AS hard drive(s) in idle; Two G.R.A.S. Type 40AE microphones, each set up at 1 meter away from the Synology NAS front and rear; Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8% | Certification |
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Warranty | 5 Years |
Environment & Packaging | |
Environment | RoHS Compliant |
Packaging Content |
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Optional Accessories |
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*Model specifications are subject to change without notice. Please refer to www.synology.com for the latest information.
Documentation:
Download the Synology Expansion Unit RX1225RP Datasheet (PDF).

Synology has you covered
The RX1225RP is backed by Synology's 5-year limited warranty, including technical support and hardware replacement services to maximize your return on investment and ensure continued high-quality performance.
- All Prices are Inclusive of GST
- Pricing and product availability subject to change without notice.