Synology Expansion Unit RX418 – 4-Bay Rackmount Storage Expansion

The Synology Expansion Unit RX418 – 4-Bay Rackmount Storage Expansion is a 1U rackmount 4-bay expansion chassis designed to provide scalable storage for Synology RackStation servers. With four hot-swappable 3.5″/2.5″ SATA drive bays and seamless integration through a dedicated eSATA connection, it allows businesses to expand their existing NAS capacity instantly without downtime. Ideal for enterprise, SMBs, and data-driven environments, the RX418 ensures reliable performance, enterprise-grade management, and efficient backup solutions. Drive Bays 4 x 3.5″/2.5″ SATA HDD/SSD (hot-swappable) Supports SATA III (6Gb/s) and SATA II (3Gb/s) drives Storage Expansion Expands storage capacity of compatible Synology RackStation models Supports online volume expansion and creation of independent volumes RAID support includes Synology Hybrid RAID (SHR), JBOD, RAID 0, 1, 5, 6, 10 Connectivity Interface: 1 × eSATA (dedicated host connection) Bandwidth: 6 Gb/s per drive bay for smooth data flow Performance Instant plug-and-play expansion without system downtime Supports SSD caching with compatible drives for performance boosts Integrated into Synology DSM for easy and centralized storage management Design & Build Form Factor: 1U rackmount chassis Hot-swappable drive trays for quick installation and replacement Efficient cooling with integrated smart-controlled fans Power & Efficiency Power Supply: 250 W AC power supply Power Consumption: ~31 W (access) ~15 W (HDD hibernation) Physical Specifications Dimensions (H × W × D): 44 × 480 × 222 mm Weight: ~4.6 kg (without drives) Compatibility Designed for Synology RackStation models supporting expansion units (e.g., RS822 , RS1221 , RS1619xs , etc.) Expands maximum raw storage capacity depending on host NAS Warranty & Support Warranty: 3 Years (extendable in select regions) Typical Use Cases Rackmount NAS capacity expansion for growing business data Centralized backup storage for enterprise workloads Surveillance video archiving with Synology Surveillance Station Scalable hybrid cloud storage with Synology C2 integration Key Features 1U rackmount chassis with 4 drive bays Supports both 3.5″ and 2.5″ SATA HDD/SSD drives Seamless expansion via dedicated eSATA connection RAID flexibility with SHR and traditional RAID modes Enterprise-ready with hot-swap design and smart cooling Meta Description Synology Expansion Unit RX418 – 4-Bay Rackmount Storage Expansion with 4 hot-swappable SATA drive bays in a 1U rackmount chassis. Expand your RackStation NAS instantly via eSATA with RAID support and enterprise reliability. Datasheet