Storage expansion and accessories Expansion Unit RX1225RP Expansion Unit RX1225RP
Expansion Unit RX1225RP Reliable storage expansion with redundant power See why Synology drives are ideal
Features Specs
Seamless 12-bay capacity expansion Add 12 additional storage bays to compatible RackStation systems with a single RX1225RP without system or service downtime. Download Datasheet
Redundant design for high reliabilityModular drive trays and system fans enable easy and quick replacement, reducing the impact of maintenance on service availability. Redundant power supply units keep your data online in the event one power source fails.
Simple deployment and managementGet 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.

Performance backed by Synology drives

Designed for Synology systems, Synology drives deliver consistent performance and unmatched reliability for your deployments.

HDD
Enterprise Series 3.5" SATA
SSD
Enterprise Series 2.5" SATA
Hard drives designed for SynologySee how Synology hard drives deliver reliability, consistent performance, and simplified system management through deep hardware-software integration.Watch video Synology has you coveredThe 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.Learn moreGet in touchWhere to buyLearn moreAsk SynologyLearn moreNotes:Storage drives are sold separately. Refer to the compatibility list for compatible devices before purchasing drives. For more details, please refer to this article.The warranty period starts from the date of purchase as stated on your purchase receipt. Visit https://www.synology.com/company/legal/warranty for more information.
Hardware Specifications
Applied Models
Applied Models
 Supports creating volumes across different units RS2825RP+
Notes To have better performance, we recommend creating storage volumes physically located within the same NAS or Expansion Unit, rather than creating volumes across your NAS and Expansion Unit.
Storage
Storage
 Drive Bays 12
Drive Type (See all supported drives)
  • 3.5" SATA HDD
  • 2.5" SATA SSD
Hot Swappable Drive*
RAID Management through Synology DSM
Notes
  • Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability.
  • "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
External Ports
External Ports
 Expansion Port 1
Appearance
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
 Power Recovery Synchronized with the Synology RackStation
Power Supply Unit / Adapter 550 W
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)
Redundant Power Supply
Notes For more information on how power consumption is measured, refer to this article.
Temperature
Temperature
 Operating Temperature 0°C to 35°C (32°F to 95°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F)
Operating humidity 8% to 80% RH
Storage Humidity 5% to 95% RH
Others
Others
 System Fan 80 mm x 80 mm x 4 pcs
Easy Replacement System Fan
Noise Level* 39.5 dB(A)
Notes Noise Level Testing Environment: Fully loaded with Synology SAT5200-480G SSD in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
Certification
Certification
  • UL
  • FCC
  • CE
  • BSMI
  • UKCA
  • EAC
  • VCCI
  • RCM
  • KC
  • BIS
Warranty
Warranty
 5 Years
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment & Packaging
Environment
Environment
 RoHS Compliant
Packaging Content
Packaging Content
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Cord X 2
  • Expansion Cable: MiniSAS-HD X 1
Optional Accessories
Optional Accessories
Notes: Model specifications are subject to change without prior notice. The figures are based on Synology internal testing. Each performance test is done individually. No other services or applications are processed at the same time. The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations. If usage requirements exceed the specifications above, please contact our regional partners for professional advice.