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Synology RX426 4-Bay 1U Rackmount Expansion Unit (Diskless)
Synology

Synology RX426 4-Bay 1U Rackmount Expansion Unit (Diskless)

Bottom line: The Synology RX426 4-Bay 1U Rackmount Expansion Unit is a specs-and-price decision rather than a crowd-consensus one in the external storage category. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For external drives and portable storage, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ 3-Year Hardware Warranty
  • ✓ Backed by Synology's warranty and support channels

Cons

  • ✗ Check the listed dimensions, connectors and platform compatibility against your setup before ordering
  • ✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

Manufacturer description

The Synology RX426 is a 1U short-depth expansion unit designed to effortlessly scale the storage capacity of your compatible Synology RackStation setup. Equipped with 4 drive bays, plug-and-play USB Type-C connectivity, and support for online volume expansion, the RX426 provides seamless, uninterrupted storage growth without interrupting ongoing system services. Its low-profile chassis allows for versatile installation in standard 2-post racks or wall-mount enclosures, making it an ideal choice for space-constrained server rooms, edge computing, and branch offices.

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SpecPicks Verdict

SpecPicks scored Synology RX426 4-Bay 1U Rackmount Expansion Unit using a rating × review-volume × price-fit model applied to published specs and reviews across the external storage category. Synology's external storage lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for external storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

  • 4-Bay Storage Expansion: Easily adds four 3.5" or 2.5" SATA drive bays to compatible Synology RackStation units.
  • Compact 1U Short-Depth Design: Low-profile chassis fits seamlessly into 2-post racks or wall-mount enclosures for space-constrained setups.
  • Plug-and-Play Integration: Expansion connects via USB Type-C and allows online volume creation or expansion without powering down the host system or interrupting services.
  • 3-Year Hardware Warranty

Full Specifications

Size20.47x15.16x4.72 in
BrandSynology
ColorBlack
MaterialMetal
Unit Count1 Count
ConnectivityUSB
Model NumberRX426
Mounting TypeRack Mount, Wall Mount
Mfr Part NumberRX426
Compatible DevicesServers
Enclosure MaterialMetal
Warranty Description3 Year Manufacturer
4-Bay Storage ExpansionEasily adds four 3.5" or 2.5" SATA drive bays to compatible Synology RackStation units.
Plug-and-Play IntegrationExpansion connects via USB Type-C and allows online volume creation or expansion without powering down the host system or interrupting services.
Compact 1U Short-Depth DesignLow-profile chassis fits seamlessly into 2-post racks or wall-mount enclosures for space-constrained setups.

Ready to buy?

Synology RX426 4-Bay 1U Rackmount Expansion Unit (Diskless) is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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Synology RX426 4-Bay 1U Rackmount Expansion Unit (Diskless)
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