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