Synology Expansion Unit DX517 – 5-Bay Storage Expansion

The Synology Expansion Unit DX517 – 5-Bay Storage Expansion is a flexible and reliable storage expansion solution designed for Synology DiskStation and RackStation NAS models. Featuring five hot-swappable 3.5″/2.5″ SATA drive bays, the DX517 allows businesses and advanced users to expand their NAS capacity instantly without downtime. With plug-and-play integration, Synology Hybrid RAID (SHR) support, and automatic volume expansion, this unit is ideal for growing data storage needs, backup solutions, and high-capacity applications. Drive Bays 5 x 3.5″/2.5″ SATA HDD/SSD (hot-swappable) Supports both SATA III (6Gb/s) and SATA II (3Gb/s) drives Storage Expansion Expands the storage capacity of supported DiskStation and RackStation models Automatic volume expansion without system downtime Supports creation of new volumes for independent storage use Compatible with Synology Hybrid RAID (SHR), JBOD, RAID 0, 1, 5, 6, 10 Connectivity Interface: 1 × eSATA (dedicated connection to host NAS) Max Bandwidth: 6 Gb/s transfer speed via eSATA Performance Plug-and-play setup ensures minimal downtime Integrated with Synology DSM for centralized storage management Supports SSD cache with compatible drives for improved performance Design & Build Hot-swappable drive trays for quick installation and replacement Compact and quiet design for office/server room environments Equipped with smart-controlled fan for efficient cooling Power & Efficiency Power Supply: External 100 W Power Consumption: ~21 W (access) ~9 W (HDD hibernation) Physical Specifications Dimensions (H × W × D): 157 × 248 × 233 mm Weight: ~3.9 kg (without drives) Compatibility Works with select Synology DiskStation and RackStation models Supported models can be expanded up to their maximum capacity with DX517 Warranty & Support Warranty: 3 Years (extendable in some regions) Typical Use Cases Seamless NAS expansion for growing business data Backup storage for critical workloads Media archiving for creative teams Surveillance video retention with Surveillance Station Key Features 5 hot-swappable 3.5″/2.5″ SATA drive bays eSATA connectivity with 6 Gb/s bandwidth Plug-and-play volume expansion with no downtime Supports Synology SHR and multiple RAID levels Compact, efficient, and quiet design Meta Description Synology Expansion Unit DX517 – 5-Bay Storage Expansion with 5 hot-swappable SATA drive bays, eSATA connectivity, and support for SHR/RAID. Expand your DiskStation or RackStation storage seamlessly without downtime. Datasheet