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Synology RX418 4-Bay Expansion Unit- Diskless, 1U Rackmount

4-bay 1U rackmount expansion unit for 1U RackStation

Storage capacity expansion

When the storage capacity on Synology 1U RackStation reaches its limit, Synology expansion unit RX418 provides easy capacity expansion by adding 4 3.5"/2.5" SATA drives to the system. Synology RX418 can also be used as a dedicated local backup destination of Synology 1U RackStation for comprehensive data protection.

Reliable plug-and-play design

Simply connect Synology RX418 to corresponding Synology RackStation and it is ready to use. Drives in the connected Synology RX418 operate as though they were internal to the connected Synology NAS and can be managed directly by Synology DiskStation Manager (DSM), with no additional software installation required.

Green and easy to manage

Award-winning Synology DSM provides an intuitive user interface for easy system management. Drive hibernation can be configured in DSM to take effect automatically when the system has been inactive for a period of time. This not only saves energy but also extends the lifespan of the installed drives.



Applied Models







DSM version requirement: 6.1.4-15217-3 or later version


Drive Bays


Compatible Drive Type*(See all supported drives)




Maximum Internal Raw Capacity

48 TB (12 TB drive x 4) (Capacity may vary by RAID types)

Hot Swappable Drive

RAID Management through Synology DSM

External Ports

eSATA port



Size (Height x Width x Depth)

44 mm x 480 mm x 325 mm


4.28 kg


Power Recovery

Synchronized with the Synology RackStation

Power Supply Unit / Adapter


AC Input Power Voltage

100V to 240V AC

Power Frequency

50/60 Hz, Single Phase

Power Consumption*

23.26 W (Access)

6.39 W (HDD Hibernation)

British Thermal Unit

79.42 BTU/hr (Access)

21.82 BTU/hr (HDD Hibernation)


Power consumption is measured when fully loaded with Western Digital 1TB WD10EFRX hard drive(s).


Operating Temperature

5°C to 35°C (40°F to 95°F)

Storage Temperature

-20°C to 60°C (-5°F to 140°F)

Relative Humidity

5% to 95% RH


System Fan

40 mm x 40 mm x 3 pcs

Noise Level*

25.1 dB(A)


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%


FCC Class A

CE Class A

BSMI Class A






3 Year Hardware Warranty, Extendable to 5 Year Coverage - EW201

Environment & Packaging


RoHS Compliant

Packaging Content

Main Unit X 1

User's Guide X 1

Accessory Pack X 1

AC Power Cord X 1

Expansion Cable: eSATA X 1

Optional Accessories

Synology RKS1317 - Rail Kit Sliding

Synology RKM114 - Rail Kit Mounted

No additional files, specification sheets, guides or documentation found for product.

Warranty: 36 Month Manufacturers Return To Base

Full manufacturers warranty details are available at the manufacturers (Synology) web site.

Unless otherwise specified Techbuy is normally your first point of contact for warranty related returns, further information regarding our warranty policies and consumer guarantees is available on our policies and service & support pages.

To apply for return of a product just go to our returns page.

These terms are in addition to and do not affect any terms, conditions, guarantees and warranties implied by law.

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