5-Bay Expansion Unit for 3.5"/2.5" SATA Drives Add 5 additional drives to your Synology DiskStation. The DX517 is an expansion unit with drive bays for 3.5" and 2.5" SATA drives, allowing for seamless volume expansion without interrupting operations, and can also serve as a local backup destination. **On-the-Fly Volume Expansion** Once connected, the additional drives in the DX517 are immediately ready for use. Management is done through DiskStation Manager on the host NAS server. Volume expansion occurs instantly—your storage and services on the host server remain uninterrupted. **Hot-Swap Drive Support in Bays** The hot-swap support in the DX517 bays allows for easy installation and replacement of drives without the need to power down the system. The tool-less design reduces the time needed for system setup. **Specialized Local Backup Solution** The Synology DX517 can also be used as a specialized local backup solution for Synology DiskStation. If the DX517 is configured as a separate volume, it serves as an excellent solution for backing up data to its local hard drives in case of system failure. **Hardware Specifications** - Type and Number of HDD: 5 x 2.5” SATA or 5 x 2.5” SATA/SSD - External HDD Connection Interface: eSATA - Number of eSATA Ports: 1 - Maximum Total Capacity: 50 TB (5 hard drives of 10 TB each) - Hot-Swap HDD: Yes - Dimensions (mm): 157 mm x 248 mm x 233 mm - Weight: 3.91 kg - Type and Number of Fans: 2 fans (80mm x 80mm) - Auto Restart After Power Failure: Yes - Input Voltage Type: 100V to 240V ~ - Power Supply Output Voltage, Volts: 12 - Power Supply Frequency: 50Hz to 60Hz, single-phase - Power Consumption: 29.9 W (access) 2.4 W (hard disk hibernation) - Supported Models: DS1817+, DS1517+ **Temperature Specifications** - Operating Temperature: 5 to 35°C - Storage Temperature: -10°C to 70°C - Relative Humidity: 5% to 95% RH - Maximum Altitude: 3000 m - Certification: FCC Class B, CE Class B, RoHS: Yes **Volume Management** - Supported RAID Types: Synology Hybrid RAID, Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 5+Spare, RAID 6, RAID 10