This article covers 【NAS用拡張ユニット】Synology RX418 [4ベイ.
Overview
The Synology RX418 is a 4-bay expansion unit designed specifically for Synology 1U RackStation NAS models. When your main NAS runs out of storage, this unit lets you add up to four SATA drives (3.5" or 2.5") with a simple cable connection. It works as a plug-and-play extension: no additional software is needed, and all drives are managed directly from the DiskStation Manager (DSM) interface. The chassis is a 1U rackmount form factor, making it easy to integrate into existing server racks. This unit is ideal for small businesses or prosumers who need reliable, expandable storage without replacing their current NAS.
Connectivity & Compatibility
The RX418 connects to a compatible Synology RackStation via the included expansion cable. Supported models are: RS1219+, RS818(RP)+, RS815(RP)+, RS816, and RS815. It does not work with other RackStation models or desktop DS series units. The drives appear as a native volume in DSM, allowing RAID expansion, backup targets, or additional storage pools. The interface uses SATA III (6 Gbps) for each bay, suitable for both HDDs and SSDs. Note that the unit itself does not include any drives; you must purchase them separately.
Product Info
Released around 2018, the Synology RX418 remains a solid choice for expanding 1U RackStation storage. It is positioned in the mid-range market, offering a cost-effective way to add capacity compared to replacing the entire NAS. The unit comes with a standard 3-year warranty and 3 years of EU spare parts availability. Accessories include the expansion cable, power cable, and quick installation guide. Pricing typically ranges around ¥130,000–¥140,000 JPY (approx. $900–$1,000 USD). It is available through online retailers, Synology’s official store, and authorized resellers. As a first-party expansion, it guarantees seamless integration with DSM features like drive hibernation and SMART monitoring.
Best Use Cases
- Expanding storage on a RackStation: If you own an RS1219+, RS818+, or other supported model and need more capacity, the RX418 is the simplest route. Just connect and add drives; DSM will recognize them immediately. This avoids the hassle of migrating to a new NAS.
- Creating a local backup target: Use the RX418 as a dedicated backup volume. With Hyper Backup or Snapshot Replication, you can keep backups separate from primary storage, improving data protection.
- Maintaining a tidy rack environment: The 1U form factor fits neatly into existing racks, preserving airflow and cable management. It’s a space-efficient way to grow storage.
Not recommended for users who need more than 4 bays, want to use non-Synology hardware, or have a DS series desktop NAS. Also, those looking for a complete new NAS with more processing power may find a standalone unit more suitable.
Product Disclosure (Amazon)
- Manufacturer: Synology
- Seller: nextDREAM
- Fulfilled by: nextDREAM
- ASIN: B078W4JTBR
- Note: This article covers a manufacturer-made product based on Amazon listing details.
