Expansion Unit RX1223RP

Reliable storage expansion with redundant power

Seamless 12-bay capacity expansion

Add up to 96 storage bays to compatible units with Synology Expansion Unit RX1223RP. Enlarge or create new volumes without system or service downtime thanks to online storage expansion.

Download Datasheet

Expand storage on the fly

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

Modular 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.

Redundant design for high reliability

Simple deployment and management

Plug-and-play design means the RX1223RP is ready to use as soon as it is connected to a host device.

Online storage expansion and easy storage management in Synology DiskStation Manager’s (DSM) simplify configuration and management.

Simple deployment and management

Backed by Synology drives

Leverage high sustained performance and reliability with enterprise-grade drives with built-in data protection designed for Synology systems.

img enterprise-hatimg enterprise-sat
Synology has you covered

Synology has you covered

The RX1223RP is backed by Synology's 5-year limited warranty,1 including technical support and hardware replacement services to maximize your return on investment and ensure continued high-quality performance. Learn more


  1. 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
  • SA series:SA6400
  • 23 series:RS2423RP+, RS2423+
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.
Drive Bays 12
Compatible Drive Type* (See all supported drives)
  • 3.5" SATA HDD
  • 2.5" SATA SSD
Hot Swappable Drive*
RAID Management through Synology DSM
  • 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
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 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 93.59 W (Access)
30.73 W (HDD Hibernation)
British Thermal Unit 319.34 BTU/hr (Access)
104.86 BTU/hr (HDD Hibernation)
Redundant Power Supply
Notes For more information on how power consumption is measured, refer to this article.
Operating Temperature 0°C to 35°C (32°F to 95°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F)
Relative Humidity 5% to 95% RH
System Fan 80 mm x 80 mm x 4 pcs
Easy Replacement System Fan
Noise Level* 54.3 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%
  • UL
  • FCC
  • CE
  • BSMI
  • UKCA
  • EAC
  • VCCI
  • RCM
  • KC
5 Years
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment & Packaging
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
  • Quick Installation Guide X 1
Optional Accessories
Optional Accessories


  1. Model specifications are subject to change without prior notice.
  2. 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.
  3. The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations.
  4. If usage requirements exceed the specifications above, please contact our regional partners for professional advice.