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Synology RX418

Synology RX418 4-Bay 1U expansion unit

Synology - Synology RX418 4-Bay 1U expansion unit; 3.5" SATA HDD; 2.5" SATA HDD; 2.5" SATA SSD; hot-swappable drives; 1 x eSATA; 44 x 430.5 x 290 mm; 4.28 kg; RS818 , RS818RP , RS816, RS815 , RS815RP , RS815
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Prices, images and descriptions are for reference purposes only & may change without prior notice. PLEASE RELY ON ABOVE DESCRIPTIONS AND NOT ON IMAGES. Synology RX418 Synology RX418 4-Bay 1U expansion unit is available from Laptop Direct and it is sold as new from our NAS - Enclosures for NAS / no drives included range of products. For reference purposes, the price of R10780 is valid 2026-10-06, and while stocks last, may be valid until . The price displayed is a guide for reference purposes only, and may change without prior notice. Reference prices are an invitation for potential buyers to make an offer to purchase, which we may reject without reason. A quote with final pricing is sent before a purchase can be made. T&C's apply. E&OE. Laptop Direct. You are looking at products found in the NAS - Enclosures for NAS / no drives included category.
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Specification for the entire series

Important information: Kindly note that specifications differ between models. Features, options and accessories displayed below this paragraph are not included with this product unless it has been specified in the above description.


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Synology RX418

Synology RX418 4-Bay 1U expansion unit

Synology RX418 4-Bay 1U expansion unit; 3.5" SATA HDD; 2.5" SATA HDD; 2.5" SATA SSD; hot-swappable drives; 1 x eSATA; 44 x 430.5 x 290 mm; 4.28 kg; RS818 , RS818RP , RS816, RS815 , RS815RP , RS815

About this product

The Synology RX418 is a 4-bay 1U rackmount expansion unit designed to add storage capacity to compatible Synology RackStation NAS systems. It supports 3.5 inch SATA HDDs, 2.5 inch SATA HDDs and 2.5 inch SATA SSDs, with hot-swappable drive bays and direct management through Synology DiskStation Manager. Buy the Synology RX418 from our website for a practical storage expansion solution for compatible Synology NAS environments.

Overview Summary

Synology RX418 4-Bay 1U Rackmount Expansion Unit provides four additional SATA drive bays for compatible Synology RackStation systems. The unit connects to the host NAS through an eSATA expansion port and allows installed drives to be managed through Synology DiskStation Manager without requiring additional software.

The RX418 is suitable for expanding available storage or providing a dedicated local backup destination for compatible Synology RackStation systems. Its 1U rackmount form factor makes it suitable for server rooms and rack-based storage installations where efficient use of rack space is important.

What tier does this fall into?

Professional rackmount storage expansion

What is this best for?

NAS storage expansion, local backup storage, business file storage, rackmount storage infrastructure

Description

The Synology RX418 is a dedicated storage expansion unit designed for compatible Synology RackStation NAS systems. Its 1U rackmount chassis contains four drive bays, allowing additional SATA storage to be connected to the host NAS while maintaining a compact rack-based installation.

The RX418 supports 3.5 inch SATA hard disk drives, 2.5 inch SATA hard disk drives and 2.5 inch SATA solid state drives. The four drive bays support hot-swappable drives, making it possible to replace compatible drives without requiring the expansion unit to be removed from the rack. RAID management is handled through Synology DiskStation Manager when connected to a supported Synology NAS.

Connection to the compatible RackStation is provided through one eSATA expansion port. Once connected, drives installed in the RX418 can operate as part of the connected Synology storage environment and can be managed directly through DSM. The unit can also be used as a dedicated local backup destination for compatible Synology RackStation systems.

The 1U chassis measures 44 mm high, 430.5 mm wide and 290 mm deep without rack mounting kits. With the server ears fitted, the dimensions are 44 mm high, 480 mm wide and 325 mm deep. The RX418 weighs 4.28 kg and uses three 40 mm x 40 mm x 20 mm system fans for cooling.

Features

The Synology RX418 provides a straightforward way to increase storage capacity on compatible Synology RackStation systems while maintaining a compact rackmount design.

  • Four drive bays for additional SATA storage.
  • Supports 3.5 inch SATA HDDs.
  • Supports 2.5 inch SATA HDDs.
  • Supports 2.5 inch SATA SSDs.
  • Hot-swappable drive support for supported drives.
  • One eSATA expansion port for connection to a compatible Synology RackStation.
  • Drive and RAID management through Synology DiskStation Manager on supported systems.
  • Can be used as a dedicated local backup destination for compatible Synology RackStation systems.
  • Compact 1U rackmount form factor.
  • Power recovery synchronizes with the connected Synology RackStation.
  • Three system fans provide active chassis cooling.
  • Supports 4-post 19 inch rack installation with compatible Synology rail kits.
  • Supports direct mounting in a 2-post 19 inch rack.

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.

What's in the Box

  • Synology RX418 expansion unit
  • Quick Installation Guide
  • Accessory pack
  • Expansion cable
  • AC power cord

Specifications

© 2026 Respective owners and brand holders. This table has been carefully researched and generated by Laptop Direct CC (https://www.laptopdirect.co.za), however, errors and omissions may occur. Only references to South Africa apply. All products are sourced in South Africa from the official suppliers and the warranty is that of the local supplier. E&OE. This table and our site's content may be used on condition that this notice and link remains intact and unaltered.
Specifications and features
Product Code Synology RX418spacer
Hardware Specifications
Applied Models RS818(RP)
RS815(RP)
RS816
RS815
Some models support independent volumes creation only. Please
Note DSM version requirement: 6.1.4-15217-3 or later version
Storage
Drive Bays 4
Compatible Drive Type 3.5" SATA HDD
2.5" SATA HDD
2.5" SATA SSD
Maximum Internal Raw Capacity 48 TB (12 TB drive x 4) (Capacity may vary by RAID types)
Hot Swappable Drive Yes
RAID Management through Synology DSM Yes
External Ports
eSATA port 1
Appearance
Size (Height x Width x Depth) 44 mm x 480 mm x 325 mm
Weight 4.28 kg
Power
Power Recovery Synchronized with the Synology RackStation
Power Supply Unit / Adapter 100W
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)
Note Power consumption is measured when fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
Temperature
Operating Temperature 5degreesC to 35degreesC (40degreesF to 95degreesF)
Storage Temperature -20degreesC to 60degreesC (-5degreesF to 140degreesF)
Relative Humidity 5% to 95% RH
Others
System Fan 40 mm x 40 mm x 3 pcs
Noise Level 25.1 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: 24.25-25.75degreesC; Humidity: 58.2-61.8%
Certification FCC
CE
BSMI
EAC
VCCI
RCM
KC
Environment & Packaging
Environment 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

FAQ

What is the Synology RX418 used for?

The Synology RX418 is used to expand the available storage of compatible Synology RackStation NAS systems or provide a dedicated local backup destination.

How many drives can the Synology RX418 hold?

The RX418 has four drive bays and supports 3.5 inch SATA HDDs, 2.5 inch SATA HDDs and 2.5 inch SATA SSDs.

Which Synology NAS systems are compatible with the RX418?

The officially listed compatible models include RS818 , RS818RP , RS816, RS815 , RS815RP and RS815. Synology also lists additional later RackStation models as compatible, so compatibility should be checked against the specific NAS model and DSM version.

Does the Synology RX418 support hot-swappable drives?

Yes. The RX418 supports hot-swappable drives for compatible SATA storage devices.

How does the RX418 connect to a Synology NAS?

The RX418 connects to a compatible Synology RackStation using its single eSATA expansion port and the supplied expansion cable.

Can the RX418 be managed through Synology DSM?

Yes. On supported Synology systems, drives installed in the RX418 can be managed through Synology DiskStation Manager.

Is the Synology RX418 suitable for a server rack?

Yes. The RX418 uses a compact 1U rackmount chassis and supports installation in compatible 19 inch 4-post racks and direct mounting in 2-post racks.

Are hard drives included with the Synology RX418?

No. Storage drives are not included and must be purchased separately. Compatible drives should be selected according to the Synology compatibility list for the connected NAS and expansion unit.

What are the dimensions of the Synology RX418?

The RX418 measures 44 x 430.5 x 290 mm without rack mounting kits. With server ears, the dimensions are 44 x 480 x 325 mm.

How much does the Synology RX418 weigh?

The Synology RX418 weighs 4.28 kg.

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