Synology RX418 4-Bay Expansion Unit
Product Overview
The Synology RX418 is a 1U rackmount expansion unit designed to extend compatible Synology RackStation NAS systems. It adds four additional hot‑swappable SATA bays (3.5″ or 2.5″ HDD/SSD) via a single eSATA connection. Once connected, volumes on the RX418 appear as if they were part of the main NAS and can be managed directly through DSM without extra software. It’s ideal for growing storage demands or serving as a local backup target.
Key Features
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Adds 4 hot‑swappable SATA bays (supports 2.5″ or 3.5″ HDD/SSD)
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Seamless plug‑and‑play integration via eSATA—you manage it via DSM as native storage.
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Supports RAID volumes via DSM across expansion unit drives
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Energy‑saving with drive hibernation control in DSM for reduced wear and consumption.
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Compatible with Synology‑certified HDDs and SSDs for highest reliability.
Specs
| Specification | Details |
|---|---|
| Drive Bays | 4 × hot-swappable 3.5″ or 2.5″ SATA |
| Connectivity | 1 × eSATA port |
| RAID Support | Yes (managed via NAS DSM) |
| Power Supply | 100 W internal PSU, AC 100–240V |
| Typical Power Consumption | ~23.3 W access / ~6.4 W hibernation |
| Cooling | 3 × 40 mm fans |
| Noise Level | ~25 dB(A) idle |
| Dimensions (HxWxD) | 44 × 480 × 290 mm (4.28 kg) |
| Rack Mount | 1U; supports 4‑post or 2‑post racks |
| Operating Temperature | 5 °C to 35 °C |
| Storage Temperature | –20 °C to 60 °C |
| Humidity (Operating) | 5% to 95% RH |
| Warranty | 3 years |
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Why Choose This Product
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Effortless capacity scaling: Add up to four drives without modifying your primary NAS.
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Plug‑and‑play simplicity: Once plugged in via eSATA, it functions like internal storage, manageable in DSM.
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Energy-efficient design: Automatic drive standby prolongs drive lifespan and cuts power usage.
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High DSM integration: Full RAID and volume management handled via host NAS’s interface.
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Designed for compatibility with supported Synology servers such as RS1221+, RS818+, RS820RP+, RS1219+, RS815/816/818 series.
FAQs
Q1: Which RackStation models support the RX418?
Compatible models include 1U units like RS1221+, RS1221RP+, RS820RP+, RS818RP+, RS815RP+, RS816 and related series. It is not supported on newer DX/RX models unless listed in Synology’s compatibility list.
Q2: Can I create RAID volumes across drives from the main NAS and the RX418?
Technically yes—but Synology recommends creating volumes entirely within one unit (either NAS or RX418) for optimal performance.
Q3: What’s the maximum raw capacity supported?
Synology states up to 48 TB (4 × 12 TB HDD), though larger drives may be incompatible in some expansion units per user reports.
Q4: Will drive hibernation settings from my NAS apply to the RX418?
Yes—DSMs drive power settings apply uniformly to drives in the RX418, helping reduce energy use.
Q5: What if an expansion unit fails or becomes unresponsive?
Users report possible failure of power supplies or connection issues. Faulty cables or PSU replacements often resolve issues—but consult Synology support before hardware repair.
Q6: Can RX418 be used in high‑availability clusters?
Yes—as long as host RackStation supports features like Synology High Availability and expansion support is enabled.
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